CBSE Test Paper-04
Chapter 06 Life Processes
1.Which of the following does not respire through lungs? (1)
1.Duck
2. Frog
3. Whale
4. Tadpole
2. An apparatus was set-up to show that germinating seeds release carbon dioxide
during respiration. which observation out of the following should be made to get
correct results ? (1)
a. See if the KOH in the test tube has absorbed CO2 released by germinating seeds
b. Check the change in the level of water present in the beaker
c. Check if CO2 is coming into the delivery tube
d. Carefully observe if there is any change in the size of germinating seeds
3. In the experiment to prove that light is necessary for photosynthesis, which one of the
following is not required ? (1)
a. Water
b. KOH
c. Iodine
d. Alcohol
4. The rate of photosynthesis is maximum in (1)
a. Green light
b. Red light
c. Brown light
d. Yellow light
5. The figure which does not illustrate any of the steps of the experiment to show that
light is necessary for photosynthesis is (1)
a. I
b. I, II, and IV
c. I and III
d. III
6. What is the function of amylase? (1)
7. What are resins and gums? (1)
8. What is the quantity of blood in human body? (1)
9. Write one function of valves in the walls of veins. (1)
10. Differentiate between Pulmonary artery and Pulmonary veins. (3)
11. How many pairs of salivary glands are there in humans ? Where do they open? (3)
12. How is respiration different from breathing. (3)
13. Give the chemical equation of photosynthesis. (3)
14. Describe the flow of blood through the heart of human beings. (5)
15. i. Draw the structure of a nephron and label the following parts on it. (5)
a. Renal artery
b. Bowman's capsule
c. Glomerulus
d. Collecting duct
ii. Name four substances in the initial filtrate which are selectively reabsorbed as the
filtrate floor along the tubule.
Answers
1. d. Tadpole
Explanation: A tadpole lives under water so it only has one way of gas
exchange (through the gills). First, the tadpoles open their mouth to let water
enter. Then, the water moves into the gills which contain small membranes
called lamella.
2. b. Check the change in the level of water present in the beaker
Explanation: The level of water in U-shaped delivery tube dipped in water of
the beaker rises.
3. b. KOH
Explanation: The leaf has to be boiled in alcohol in a water bath and to be
tested with iodine for starch.
4. b. Red light
Explanation: The main factors affecting rate of photosynthesis are light
intensity, carbon dioxide concentration and temperature.The wavelength of
light is also important. PSI absorbs energy most efficiently at 700 nm and PSII at
680 nm. Light with a higher proportion of energy concentrated in these
wavelengths will produce a higher rate of photosynthesis. The wavelength of
red light is maximum.
5. d. III
Explanation: The experiment does not require heating of leaf in dried
condition.
6. Amylase converts starch into maltose.
7. Resins and gums are storage wastes of plants.
8. 5-6 litres.
9. The valves in the walls of veins prevent the backflow of blood.
10.Pulmonary artery Pulmonary veins
1) Pulmonary artery arises from the
right ventricle.
1) Pulmonary veins arise from the lungs.
2) It carries deoxygenated or impure
blood to the lungs for purification.
2) They carry the oxygenated or pure blood
to the left auricle.
3) The pulmonary artery is provided
with semilunar valves at the base in
the heart.
3) The openings of pulmonary veins into the
heart are not guarded by valves.
4) The pulmonary artery splits into
two branches, one for each lung.
4) The pulmonary vein splits into four
branches, two for each lung.
5) The pulmonary artery has a
relatively thick wall with elastic
muscle layer.
5) The muscle layer of the pulmonary vein’s
wall is much thinner than this in the
pulmonary artery.
6) The heart pumps the blood into
the pulmonary arteries at high
pressure.
6) In the pulmonary veins the blood pressure
is lower than in pulmonary arteries.
11. There are three pairs of salivary glands in human beings. They open into the buccal
cavity.
12. Differences between breathing and respiration
Breathing Respiration
1) It is ventilation or bringing in of
oxygenated air and giving out
deoxygenated air.
1) Respiration of animals includes
breathing, gaseous exchange and
catabolic breakdown of food.
2) Breathing is a physical and voluntary
process.
2) Respiration is a chemical and
involuntary process.
3) Breathing does not liberate energy. 3) It liberates energy.
4) It is restricted to organs where
gaseous exchange occurs between blood
and atmospheric air.
4) Respiration involves every living cell of
the body.
5) Breathing takes place in the
respiratory organs called as lungs.
5) Respiration takes place in the cells.
6) Breathing involves respiratory organs
and the cells called as alveoli.
6) Respiration involves cells in the body
an their organelles.
13. A chemical equation of photosynthesis is
6CO2 + 6H2O C6H12O6 + 6O2
14. The heart is the major organ of our body which continuously pumps oxygen and
nutrient-rich blood throughout our body to sustain life. As the heart beats, it pumps
blood through a system of blood vessels, called the circulatory system.
The blood enters the heart through two large veins, the inferior and superior vena
cava, emptying oxygen-poor blood from the body into the right atrium. As the atrium
contracts, blood flows from your right atrium into your right ventricle through the
open tricuspid valve. When the ventricle is full, the tricuspid valve shuts. This
prevents blood from flowing backward into the right atrium while the ventricle
contracts. As the ventricle contracts, blood leaves the heart through the pulmonic
valve, into the pulmonary artery and to the lungs, where it is oxygenated. The
oxygenated blood then returns to the heart through the pulmonary veins. And finally,
the oxygenated blood from the left ventricle is pumped through the aorta to the whole
body.
15. i.
ii. Glucose, amino acids, salts and adequate amount of water are reabsorbed initially
after ultrafiltration.
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