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.
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