GRADE X BIOLOGY 7 CONTROL AND CO ORDINATION TEST 5

 

CBSE Test Paper-04

Chapter 07 Science Control and Coordination

1. Which part of the brain is concerned with muscular coordination in the body? (1)

a. Temporal toke

b. Cerebellum

c. Pons

d. Parietal 10 be

2. Spinal cord is enclosed in bony cage called ? (1)

a. Diaphragm

b. Vertebral column

c. Cranium

d. Ribs

3. Which is the longest part of the neuron? (1)

a. Dendrites

b. myelin sheath

c. cell body

d. Axon

4. Which of the following statement are correct about glands? (1)

A. All glands are ductless

B. Pancreas is a mixed gland

C. Glands are specific in their action

D. Endocrine glands are ductless

a. B and D

b. All of these

c. B and C

d. A and C

5. Which centre regulates swallowing, coughing and vomiting? (1)

a. Pons

b. cerebrum

c. spinal cord

d. medulla oblongata

6. Name the part of neuron (1)

(a) where information is acquired.

(b) through which information travels as an electrical impulse.

7. Why are roots called positively geotropic? (1)

8. Write name of gonadotropic hormones. (1)

9. What is the function of gustatory receptors? (1)

10. Explain how the movement of leaves of a sensitive plant different from movements of

shoots towards light? (3)

11. Which part of the brain is more important? Why? (3)

12. How endocrine glands do helps in maintaining feedback control? (3)

13. Differentiate between Spinal reflex and Cranial reflex (3)

14. What are hormones? State their role in the working of the human body.Or Define

'Hormone'. What are the general functions of 'hormones'? (5)

15. Explain briefly movements in plants. (5)

Answers

1. b. Cerebellum

Explanation: It is responsible for precision of voluntary actions and

maintaining the posture and balance of the body.

2. b. Vertebral column

Explanation: spinal cord is protected by a bony structure called vertebral

column, it present in dorsal surface.

3. d. Axon

Explanation: Axon is the longest part of neuron that connects cell body and

nerve ending. Axons are in effect the primary transmission lines of the nervous

system.

4. c. B and C

Explanation: Pancreas is known as a mixed gland because it performs

functions of both exocrine and endocrine glands; and Most hormones produce

an effect on specific target tissues that are sited at some distance from the gland

secreting the hormone.

5. d. medulla oblongata

Explanation: The medulla oblongata is located in the brain stem, anterior to

cerebellum. This is a cone-shaped nerve cell located in the hind brain, which

controls a number of involuntary functions like coughing, sneezing and

vomitting.

6. (a) Dendrite of cell body.

(b) Axon

7. This is because the roots always grow towards the gravity of the Earth.

8. Follicular Simulating Hormone (FSH), Luteinising Hormone (LH) and Luteotropic

Hormone (LTH) are gonadotropic hormones

9. The gustatory receptors are the receptors that provide sense of taste. These are

distributed over the surface of the tongue in individual organs called taste buds.

10. Movements in Mimosa pudica (touch sensitive plant) occur in response to touch.

In such movements, plant cells change shape by changing the amount of water in

them resulting in folding up and drooping of leaves. This phenomenon is called

thigmonasty and this movement is independent of direction of stimuli.

Plants respond to a light by growing in or away from the direction of light, this is

known as phototropism. Movement of shoots towards light indicates positive

phototropism.

11. The medulla oblongata is the most important part of the brain. Because the medulla

oblongata helps regulate breathing, heart and blood vessel function, digestion,

sneezing, and swallowing. This part of the brain is a center for respiration and

circulation.

12. The timing and amount of hormones released are regulated by feedback mechanism.

For example, glucose level in the blood is maintained constant. The blood glucose

levels may be maintained constantly by either of the following feedback mechanism.

1. High glucose level in the blood induces the pancreatic cells to produce insulin

which converts glucose to glycogen.

2. Less glucose level in the blood do not induce the pancreateic cells to produce

insulin so that less conversion of glucose to glycogen may occur.

13.

Spinal reflex Cranial reflex

1) It occurs through the spinal nerves. 1) It occurs through the cranial nerves.

2) It is controlled by the spinal cord. 2) It is controlled by the brain.

14. Selye in 1948 defined hormones as "Physiological and organic compounds produced

by certain cells (endocrine glands) for the sole purpose of directing the activities of

distant parts of the same organism." They are also referred to as "chemical

messengers". They have excitatory effects on some organs and inhibitory effects on

others.

Functions of hormones:

i. Hormones stimulate the tissue activity.

ii. Hormones regulate growth and reproduction.

iii. Hormones control metabolism.

iv. Hormones synthesize, store and utilize substances like glucose.

v. Hormones conserve water and minerals.

15. Plant Movement

Tropic movement or tropism

Directional movement of specific part of plant in response to external stimuli is called

tropism.

These movements are very slow.The movement of plant part can be either towards or

away from stimulus.

If the movement of plant is towards stimulus,it is called positive stimulus.

If the movement of plant is away from stimulus,it is called negative stimulus.

1. Phototropism: It is the directional movement of plant part in response to light

stimulus.

If plant part move towards light it is called as positive phototropism.

For Ex:Stem or shoot

If plant part move away from light it is called as negative phototropism.

For Ex:Roots

2. Geotropism: It is the response to gravity.

If the plant part moves in the direction of gravity it is called positive

geotropism

For Ex:Roots grow downwards.

If the plant part moves against the direction of gravity it is called negative

geotropism.

For Ex:Stem grows upwards

3. Chemotropism : Response to chemical stimuli.

If Plant part move towards chemical stimuli it is positive chemotropism

If plant part move away from chemical stimuli it is negative chemotropism.

4. Hydrotropism : Response to water.

GRADE X BIOLOGY 7 CONTROL AND CO ORDINATION TEST 4

 CBSE Test Paper-04

Chapter 07 Science Control and Coordination

1. Which part of the brain is concerned with muscular coordination in the body? (1)

a. Temporal toke

b. Cerebellum

c. Pons

d. Parietal 10 be

2. Spinal cord is enclosed in bony cage called ? (1)

a. Diaphragm

b. Vertebral column

c. Cranium

d. Ribs

3. Which is the longest part of the neuron? (1)

a. Dendrites

b. myelin sheath

c. cell body

d. Axon

4. Which of the following statement are correct about glands? (1)

A. All glands are ductless

B. Pancreas is a mixed gland

C. Glands are specific in their action

D. Endocrine glands are ductless

a. B and D

b. All of these

c. B and C

d. A and C

5. Which centre regulates swallowing, coughing and vomiting? (1)

a. Pons

b. cerebrum

c. spinal cord

d. medulla oblongata

6. Name the part of neuron (1)

(a) where information is acquired.

(b) through which information travels as an electrical impulse.

7. Why are roots called positively geotropic? (1)

8. Write name of gonadotropic hormones. (1)

9. What is the function of gustatory receptors? (1)

10. Explain how the movement of leaves of a sensitive plant different from movements of

shoots towards light? (3)

11. Which part of the brain is more important? Why? (3)

12. How endocrine glands do helps in maintaining feedback control? (3)

13. Differentiate between Spinal reflex and Cranial reflex (3)

14. What are hormones? State their role in the working of the human body.Or Define

'Hormone'. What are the general functions of 'hormones'? (5)

15. Explain briefly movements in plants. (5)

CBSE Test Paper-04

Chapter 07 Science Control and Coordination

Answers

1. b. Cerebellum

Explanation: It is responsible for precision of voluntary actions and

maintaining the posture and balance of the body.

2. b. Vertebral column

Explanation: spinal cord is protected by a bony structure called vertebral

column, it present in dorsal surface.

3. d. Axon

Explanation: Axon is the longest part of neuron that connects cell body and

nerve ending. Axons are in effect the primary transmission lines of the nervous

system.

4. c. B and C

Explanation: Pancreas is known as a mixed gland because it performs

functions of both exocrine and endocrine glands; and Most hormones produce

an effect on specific target tissues that are sited at some distance from the gland

secreting the hormone.

5. d. medulla oblongata

Explanation: The medulla oblongata is located in the brain stem, anterior to

cerebellum. This is a cone-shaped nerve cell located in the hind brain, which

controls a number of involuntary functions like coughing, sneezing and

vomitting.

6. (a) Dendrite of cell body.

(b) Axon

7. This is because the roots always grow towards the gravity of the Earth.

8. Follicular Simulating Hormone (FSH), Luteinising Hormone (LH) and Luteotropic

Hormone (LTH) are gonadotropic hormones

9. The gustatory receptors are the receptors that provide sense of taste. These are

distributed over the surface of the tongue in individual organs called taste buds.

10. Movements in Mimosa pudica (touch sensitive plant) occur in response to touch.

In such movements, plant cells change shape by changing the amount of water in

them resulting in folding up and drooping of leaves. This phenomenon is called

thigmonasty and this movement is independent of direction of stimuli.

Plants respond to a light by growing in or away from the direction of light, this is

known as phototropism. Movement of shoots towards light indicates positive

phototropism.

11. The medulla oblongata is the most important part of the brain. Because the medulla

oblongata helps regulate breathing, heart and blood vessel function, digestion,

sneezing, and swallowing. This part of the brain is a center for respiration and

circulation.

12. The timing and amount of hormones released are regulated by feedback mechanism.

For example, glucose level in the blood is maintained constant. The blood glucose

levels may be maintained constantly by either of the following feedback mechanism.

1. High glucose level in the blood induces the pancreatic cells to produce insulin

which converts glucose to glycogen.

2. Less glucose level in the blood do not induce the pancreateic cells to produce

insulin so that less conversion of glucose to glycogen may occur.

13.

Spinal reflex Cranial reflex

1) It occurs through the spinal nerves. 1) It occurs through the cranial nerves.

2) It is controlled by the spinal cord. 2) It is controlled by the brain.

14. Selye in 1948 defined hormones as "Physiological and organic compounds produced

by certain cells (endocrine glands) for the sole purpose of directing the activities of

distant parts of the same organism." They are also referred to as "chemical

messengers". They have excitatory effects on some organs and inhibitory effects on

others.

Functions of hormones:

i. Hormones stimulate the tissue activity.

ii. Hormones regulate growth and reproduction.

iii. Hormones control metabolism.

iv. Hormones synthesize, store and utilize substances like glucose.

v. Hormones conserve water and minerals.

15. Plant Movement

Tropic movement or tropism

Directional movement of specific part of plant in response to external stimuli is called

tropism.

These movements are very slow.The movement of plant part can be either towards or

away from stimulus.

If the movement of plant is towards stimulus,it is called positive stimulus.

If the movement of plant is away from stimulus,it is called negative stimulus.

1. Phototropism: It is the directional movement of plant part in response to light

stimulus.

If plant part move towards light it is called as positive phototropism.

For Ex:Stem or shoot

If plant part move away from light it is called as negative phototropism.

For Ex:Roots

2. Geotropism: It is the response to gravity.

If the plant part moves in the direction of gravity it is called positive

geotropism

For Ex:Roots grow downwards.

If the plant part moves against the direction of gravity it is called negative

geotropism.

For Ex:Stem grows upwards

3. Chemotropism : Response to chemical stimuli.

If Plant part move towards chemical stimuli it is positive chemotropism

If plant part move away from chemical stimuli it is negative chemotropism.

4. Hydrotropism : Response to water.

GRADE X BIOLOGY 7 CONTROL AND CO ORDINATION TEST 3

 CBSE Test Paper-03

Chapter 07 Science Control and Coordination

1. Four lobed endocrine gland is (1)

a. Pituitary

b. Adrenal gland

c. Parathyroid gland

d. None of these

2. Match the following with correct response. (1)

(1) Thyroid gland (A) Testosterone

(2) Pancreas (B) thyroxin

(3) Testis (C) Estrogen

(4) Ovaries (D) Insulin and glucagon

a. 1-C, 2-B, 3-D, 4-A

b. 1-D, 2-A, 3-C, 4-B

c. 1-A, 2-C, 3-B, 4-D

d. 1-B, 2-D, 3-A, 4-C

3. Select the mis-matched pair (1)

a. Estrogen - Ovary

b. Testosterone - Testes

c. Adrenaline - Pituitary gland

d. Thyroxin - Thyroid gland

4. Which one of the endocrine glands is known as master gland? (1)

a. Adrenal

b. Pituitary gland

c. Thyroid

d. Parathyroid

5. Which hormone brings the development of mammary gland? (1)

a. Relaxin

b. Estrogen

c. Oxytocin

d. Progesterone

6. Name the hormone which controls (i.e. reduces) the level of sugar in blood, and the

gland which secretes it. (1)

7. Name the part of the pituitary gland which controls growth and development of

gonads. (1)

8. Name the structure that is responsible for reflex action. (1)

9. In which part adrenaline is produced? (1)

10. What do you understand by the sleep movement of plant organs? (3)

11. What are the physiological effects of gibberellins? (3)

12. Describe cavities of brain. (3)

13. How does the plant shoot bends, when the plant is placed in a room having only one

open window? (3)

14. Describe the central nervous system in human beings. (5)

15. 'Nervous and hormonal systems together perform the function of control and

coordination in human beings.' Justify the statement. (5)

CBSE Test Paper-03

Chapter 07 Science Control and Coordination

Answers

1. c. Parathyroid gland

Explanation: Parathyroid gland is four lobed,this gland is present in the neck

region.

2. d. 1-B, 2-D, 3-A, 4-C

Explanation: Thyroxin is secreted by the thyroid gland to regulate the

metabolic rate and help control body temperature; Insulin and glucagon are

hormones that help regulate the levels of blood glucose in the body secreted by

pancreas; The testes are the most essential organs of the male reproductive

system. They are the glands where sperm and testosterone are produced;

Estrogen is a female steroid hormone that is produced by the ovaries.

3. c. Adrenaline - Pituitary gland

Explanation: Adrenaline hormone is not released form pituitary gland. It is

released by adrenal gland.

4. b. Pituitary gland

Explanation: Pituitary gland is known as master gland as it controls the

release of other hormones that are required for growth and development.

5. b. Estrogen

Explanation: Estrogen hormone released from pituitary gland to help in the

development of mammary gland to feed the young ones.

6. Insulin, controls (i.e. reduces) the level of sugar in blood, and Pancreas is the gland

which secretes it.

7. Anterior lobe (Adenohypophysis) controls growth and development of gonads.

8. Spinal cord is responsible for reflex action.

9. Adrenaline is produced in adrenal gland.

10. Sleep movement or Nyctinasty is the circadian rhythmic nastic movement of higher

plants in response to the onset of darkness. Examples are the closing of the petals of a

flower at dusk and the sleep movements of the leaves of many legumes.

11. Physiological effects of gibberelline are:

i. Elongation of stem and expansion of leaf.

ii. Reversal of Dwarfism particularly in corn.

iii. Parthenocarpy.

iv. Breaking of seed and bud dormancy.

12. The brain is somewhat a hollow structure containing many cavities of various sizes.

These cavities are known as ventricles.

Each cerebral hemisphere contains a cavity, the first and second ventricles. These

ventricles are connected with the third ventricle by a canal.

The third ventricle is present in the thalamus. It is connected with the fourth ventricle

by a small central canal present in the mid brain. The roof of the third ventricle also

contains clusters of blood vessels which secrete cerebrospinal fluid.

The medulla contains the fourth ventricle. This ventricle is formed by the

enlargement of the central canal of the spinal cord. The roof of the fourth ventricle

also contains tufts of blood vessels which secrete part of the cerebrospinal fluid.

13. When the plant is placed in such a room that has only one open window, the shoot of

the plant bends towards the direction of light. Plant hormone auxin is synthesized at

the shoot tips,helps the cells to grow longer. When light is coming from one side of the

plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin

stimulates the cells to grow longer on the side of the shoot which is away from light.

Thus, the plant appears to bend towards light while growing phototropism.

14. The central nervous system in human beings consists of brain and spinal cord.

i. Brain: Brain is the highest coordinating centre in the body. It is covered by

meninges, which is made up of three layers. It is protected by cranium. Brain is

broadly divided into three parts, forebrain, midbrain and hindbrain

a. Forebrain: The forebrain includes cerebrum and olfactory lobes. Cerebrum is

the largest part of the brain. It consists of two cerebral hemispheres. Sensory

and motor receptors are present in the brain. There are various regions for

reception of vision (occipital lobe), reception of sound (temporal lobe), touch,

smell, temperature (parietal lobe) and muscular activities (frontal lobe).

Olfactory lobes are one in pair and receives olfactory nerves.

b. Midbrain: It is the small portion of the brain that connects cerebrum with the

other parts of the brain and spinal cord.

c. Hindbrain: It consists of cerebellum, pons and medulla oblongata.

Cerebellum is responsible for coordination and adjustment of movement and

posture. Pons regulate respiration. Medulla oblongata regulates swallowing,

coughing, sneezing and vomiting.

ii. Spinal cord: Medulla oblongata extends downwards, enclosed in vertebral

column to form a cylindrical structure known as spinal cord. It is also covered by

meninges. It is the reflex centre of the body.

15. The working together of various organs of human being in a systematic, controlled

and efficient way to produce a proper response to various stimuli is known as

coordination.

In human beings, the control and coordination is brought about by both nervous

system and endocrine system. Nervous system consists of receptors that receive the

stimulus from surrounding environment and send the message received by them to

the spinal cord and brain in form of electrical impulses through the sensory nerves.

The motor nerves then transmit the response to the effector. The effectors are mainly

the muscles and glands of our body. Thus, endocrine glands secreting hormones are

directly or indirectly controlled by the nervous system. For example, when an

emergency stimulus is detected by the nervous system, the stimulus is detected by the

nervous system , the stimulus is received and analysed by central nervous system that

send message to effectors to provide proper response. At the same time, the

sympathetic nervous system activates adrenal gland to release adrenaline that

prepares body by increasing heart rate, blood pressure,respiration and dilates pupil

etc.

Hence, control and coordination in humans (or animals) depend on two things for

transmitting information, i.e. chemical signals of hormones and nerve impulses.

If they depended only on nerve impulses through nerve cells, only a limited range of

tissues would be stimulated. Since, they get additional chemical signals as well, a large

number of tissues are stimulated. This is why animals can show a wide range of

response to stimulus.

GRADE X BIOLOGY 7 CONTROL AND CO ORDINATION TEST 2

 CBSE Test Paper-02

Chapter 07 Science Control and Coordination

1. Match the following with correct response. (1)

(1) Response of plant to light (A) Phototropism

(2) Response of plant to gravity (B) Hydro tropism

(3) Response of plant to water (C) Geotropism

(4) Response of plant to chemicals (D) Chemotropism

a. 1-B, 2-D, 3-A, 4-C

b. 1-A, 2-C, 3-B, 4-D

c. 1-D, 2-A, 3-C, 4-B

d. 1-C, 2-B, 3-D, 4-A

2. Which hormone cause uterine contraction that leads to labour pain? (1)

a. vasopressin

b. thyroxin

c. Estrogen

d. Progesterone

3. Match the following with correct response. (1)

(1) Temporal lobe (A) Speech facial muscular activites

(2) Parietal lobe (B) Taste, smell touch and conscious association

(3) Occipital lobe (C) Auditory reception

(4) Frontal lobe (D) Visual perception

a. 1-B, 2-D, 3-A, 4-C

b. 1-D, 2-A, 3-C, 4-B

c. 1-A, 2-C, 3-B, 4-D

d. 1-C, 2-B, 3-D, 4-A

4. Name the place where largest number of neurons are found in the human body. (1)

a. Stomach

b. Heart

c. Brain

d. Lungs.

5. Progesterone and relaxin bring about changes in the body of a (1)

a. Teenaged girl

b. old woman

c. Pregnant woman

d. Young girl

6. List different parts of the human nervous system. (1)

7. Name the hormones secreted by pancreas. (1)

8. What do we call "movement of shoot towards the light"? (1)

9. Which hormone controls the metabolism of calcium and phosphorus in human

beings? (1)

10. “Nervous and hormonal systems together perform the function of control and

coordination in human beings.” Justify the statement. (3)

11. Differentiate between Spinal reflex and Cranial reflex (3)

12. How does our body respond when adrenaline is secreted into the blood? (3)

13. How does chemical co-ordination occur in plants? (3)

14. What are the major parts of the brain? Mention the functions of different parts. (5)

15. Why do we call pituitary gland as the master gland? Where is it located and what are

its functions? (5)

CBSE Test Paper-02

Chapter 07 Science Control and Coordination

Answers

1. b. 1-A, 2-C, 3-B, 4-D

Explanation: Phototropism refers to the movement of a plant toward a light

source; the growth of the parts of plants in response to the force of gravity; the

growth or turning of plant roots towards or away from moisture;

Chemotropism may be defined as the movement or the growth of the organism

in response to a chemical stimulus.

2. d. Progesterone

Explanation: progestrone hormone is released during parturition that creates

uterine contraction like situation that cause labour pain.

3. d. 1-C, 2-B, 3-D, 4-A

Explanation: The Temporal Lobe mainly revolves around hearing and

selective listening; The parietal lobes can be divided into two functional regions.

One involves sensation and perception and the other is concerned with

integrating sensory input, primarily with the visual system; The occiptial lobe is

important to being able to correctly understand what your eyes are seeing;

frontal lobe is used on everyday basis. You use it to make decisions, such as

what to eat or drink for breakfast etc

4. c. Brain

Explanation: Human brain consists of large number of neurons. A neuron is

an electrically excitable cell that processes and transmits information through

electrical and chemical signals.

5. c. Pregnant woman

Explanation: Progesterone levels also are extraordinarily high during

pregnancy that cause a laxity and relaxin hormone produced by the ovary it

relaxes the mother's muscles, joints and ligaments to make room for the

growing baby

6.

7. Pancreas secertes Insulin and Glucagon hormone.

8. Positive phototropism is the movement of shoot towards light.

9. Parathyroid hormone

10. Control and coordination of functioning of various organ and organ system of the

body is under the direct control of nervous system in close coordination with

endocrine(hormonal) system. This control is achieved by a complex network of

neurons which carry signals in the form of electric impulses; to and from the brain

and controls the body function directly whereas, the endocrine system are the

ductless glands which release chemical substances directly into the blood and

reaching the target site for action.

Nervous and hormonal systems are complementary to each other. Thus, it can be said

that nervous and hormonal system together perform the function of control and

coordination in human beings.

11.

Spinal reflex Cranial reflex

1) It occurs through the spinal nerves. 1) It occurs through the cranial nerves.

2) It is controlled by the spinal cord. 2) It is controlled by the brain.

12. When adrenaline is secreted into the blood, it prepares our body for emergency

action. It speeds up heart beat and breathing, raises blood pressure and allows more

glucose to go into the blood to give us a lot of energy quickly to fight or urn away from

frightening situation. The blood supply decreases form the skin and digestive system

and increase to skeletal muscles. All there conditions help the individual to respond

the emergency situation.

13. Control and co-ordination in plants: Plants lack well organized control

mechanism as in animals. However plants respond to light, touch and gravitational

forces. Moreover growth and movements in plants are regulated by external and

internal factors.

Growth regulators: Plant growth regulators or phytohormones are the chemicals

occurring in minute quantities and responsible for regulating metabolism, growth

and development.

The important phytohormones are Auxins (Indole-acetic acid). Gibberellins,

Cytokinins, Ethylene, and Abscisic acid (ABA). All growth processes are regulated by

one or photohormones acting synergistically or antagonistically.

14. The brain is covered by a three layered system of membranes; called meninges.

Cerebrospinal fluid is filled between the meninges. The CSF provides a cushion to the

brain against mechanical shocks. The brain is located inside the skull for maximum

protection. The human brain can be divided into three regions, viz. forebrain,

midbrain and hindbrain.

Forebrain: It is divided into three regions:

1. Olfactory Lobes - These lobes receives impulses from olfactory receptors of nose

region.

2. Cerebrum - It is the largest part of the brain and helps in speech, intellectuality,

mapping, hearing, sight, taste, smell, etc.

3. Diencephalon - It has Hypothalamus which has control centre for hunger, thirst,

sweating, emotions, etc.

Midbrain: It controls the reflex movements of head, neck and trunk in response to

visual and auditory stimuli, changes in pupil size, etc.

Hindbrain: It consists of three parts:

1. Cerebellum - It maintains posture, equilibrium and Muscle tone.

2. Pon Varolii - It controls some aspects of respiration.

3. Medulla Oblongata - It controls heart rate, breathing movements, coughing,

sneezing, vomiting, etc.

15. The pituitary gland has three lobes that secretes various hormones. It regulates

various functions of the body i.e. growth, metabolism, sexual development and

system of reproduction. It also controls the functioning of the other endocrine glands.

Hence, it is called the master endocrine gland.

Location: Pituitary gland is about the size of a pea and is located in the centre of

brain, just below the hypothalamus. It is also known as hypophysis.

Pituitary gland secretes five important hormones. The important hormones secreted

by pituitary gland and their functions are listed below:

i. Growth hormone regulates the growth and development of bones and muscles.

ii. Tropic hormone regulates the secretion from other endocrine glands.

iii. Prolactin hormone regulates the function of mammary glands in females.

iv. Vasopressin hormone regulates water and electrolyte balance in the body.

v. Oxytocin hormone regulates the ejection of milk during lactation

GRADE X BIOLOGY 7. CONTROL AND CO ORDINATION TEST 1

 CBSE Test Paper-01

Chapter 07 Science Control and Coordination

1. Which Plant hormone essential for cell division ? (1)

a. ethylene

b. gibberellins

c. auxin

d. cytokinin

2. The neurons that carry nerve impulse from spinal cord to effectors are Known as (1)

a. Motor neurons

b. spinal neurons

c. Inteneurons

d. Sensory neurons

3. Auxins are (1)

a. Vitamins

b. Enzymes

c. Proteins

d. Hormones

4. Match the following with correct response. (1)

(1) Central nervous system (A) Brain

(2) Peripheral nervous system (B) Sympathetic nervous system

(3) Autonomic nervous system (C) Cranial and spinal nerves

(4) Reflex action (D) Reflec arc

a. 1-C, 2-B, 3-D, 4-A

b. 1-D, 2-A, 3-C, 4-B

c. 1-B, 2-D, 3-A, 4-C

d. 1-A, 2-C, 3-B, 4-D

5. The substance that cause fall of mature leave and fruits from plants is due to: (1)

a. auxin

b. gibberllin

c. cytokinin

d. ABA

6. Name the membranes covering the brain and spinal cord. (1)

7. Name the largest cell present in the human body. (1)

8. Name the gland which is called 'Master gland'. (1)

9. Name the other name of hormones. (1)

10. Sameer was studying in his room. Suddenly he smells something burning and sees

smoke in the room. He rushes out of the room immediately. Was Sameer's action

voluntary or involuntary? Why? (3)

11. In figure A, B and C, which appears more accurate and why? (3)

12. Give a few functions of gibberellins along with auxin. (3)

13. Define neurons. Identify the parts of a neuron at which: (3)

a. information is all together collected.

b. impulses are converted to chemical signal for further transmission.

14. Compare nervous and hormonal mechanism for control. (5)

15. With the help of labelled diagram explain the general scheme to illustrate how

nervous impulses travel in the body? (5)

Answers

1. d. cytokinin

Explanation: Cytokinin hormone is responsible for cell division that help in

growth of plants. It is found in sites of active cell division in plants for example:

Roots tips,seeds,fruits and leaves.

2. a. Motor neurons

Explanation: Motor neurons are responsible for carrying information from

spinal chord to effector. The cell bodies of motor neurons are inside the Central

Nervous System.

3. d. Hormones

Explanation: Auxin is a plant hormone produced in the stem tip that

promotes cell elongation. Auxin moves to the darker side of the plant, causing

the cells there to grow larger than corresponding cells on the lighter side of the

plant.

4. d. 1-A, 2-C, 3-B, 4-D

Explanation: The central nervous system (CNS) is made up of the brain, the

spinal cord, and the optic nerves; the nervous system outside the brain and

spinal cord; the part of the nervous system responsible for control of the bodily

functions not consciously directed, such as breathing, the heartbeat, and

digestive processes; Reflex action is an involuntary and nearly instantaneous

movement in response to a stimulus. It is made possible by neural pathways

called reflex arc.

5. d. ABA

Explanation: Absesic acid (ABA) hormone cause to fall of mature leaves and

fruits from plants.

6. Meninges are membranes that cover and protect the brain and spinal cord.

7. Neuron or nerve cell.

8. Pituitary gland is called the master gland because it produces hormones that

control other glands and many body functions including growth.

9. Chemical coordinators (messengers)

10. Sameer’s action was voluntary because rushing out of the room was under his

conscious control. The smoke and smell were perceived by the receptors in the sense

organs and signals are sent to the brain. The brain, then sent signals to the effector

organs, i.e., the muscles, to move out of the room to protect tthemselves.

11. This movement of plant part in response to gravity is called geotropic movement and

the phenomenon involved is called geotropism. Here, Figure (A) is more accurate to

show geotropism. The roots of a plant always grow downward in response to the

gravity (called negative geotropism) to make sure they find soil and water. On the

other hand, the stem always grows up, i.e., away from gravity pull (called positive

geotropism) to make sure it will get light. Both these conditions are shown in figure A.

12. The gibberellins are weakly acidic phytohormones which help in longitudinal growth

of the stem.

i. The two collectively control fruit growth and development.

ii. Control of flowering in long day plants.

iii. Sex expression in certain species as spraying with gibberellins cause some

cucurbits to produce female flowers.

iv. Gibberellins cause parthenocarpy in apple and pear.

13. The structural and functional units of nervous system are called neurons. It means

the units which makes up the nervous system are called neurons. These are

specialized units for acceptance and transmission of impulses to and fro between the

brain and other body parts.

a. End of dendrite tip of nerve cell.

b. Dendrite cell body axon to its ends.

14.

Nervous System Hormonal System

Made of neuron Made of Hormone

Messages transmitted in the form of

electrical impulses

Message transmitted in the form of

chemicals called hormones.

Messages transmitted along nerve fibres.

Messages transmitted through blood

stream.

Messages travel very quickly. Messages travel very slowly.

Effect of message usually lasts for a very

short while

Effect of message usually lasts longer

Sense organs are receptors as nerve cells

located in them receive information.

Glands are effectors which secrete

hormones when the brain commands.

15.

The information from the environment is detected by receptors and passed on to the

dendrite of the sensory neuron, from where the electrical signals are passed on to the

cyton then to axon and finally to the presynaptic knob which releases

neurotransmitters which goes to the synaptic cleft and generates an electric response

on to the dendrite of the next neuron and ultimately to brain (or spinal cord). The

response from brain (or spinal cord) is similarly passed on to the effector, that

undergoes the desired response.