CBSE Test Paper-05
Chapter 06 Life Processes
1. When air is blown from mouth into a test - tube containing lime water, the lime water
turned milky due to presence of- (1)
a. water vapours
b. nitrogen
c. oxygen
d. carbon dioxide
2. Shown below are four parts of a slide of an epidermal peel, marked I, II, III and IV.
Which part out of these four should be focused under high power to view complete
stomata ? (1)
a. II
b. III
c. I
d. IV
3. Which of the following raw material is required for photosynthesis? (1)
A. Carbon dioxide
B. Oxygen
C. Water
D. Hydrogen
a. All of these
b. A and B
c. A and D
d. A and C
4. A part of de-starched leaf of a potted plant was covered with black paper strips on
both sides and the plant was kept in sunlight for 8 hours. The leaf was then tested
with iodine after boiling it in alcohol. Only the uncovered part of the leaf turned blueblack.
The inference is that (1)
a. CO2 is necessary for photosynthesis
b. Light is necessary for photosynthesis
c. Chlorophyll is necessary for photosynthesis
d. Water is necessary for photosynthesis
5. Kreb’s cycle is a part of (1)
a. Fermentation
b. Anaerobic respiration
c. Aerobic respiration
d. Glycoysis
6. Name a vein the human body which carries oxygenated blood. (1)
7. From which kind of cells food materials enter in phloem? (1)
8. State one main function of Glomerulus (1)
9. What is the size of RBC? (1)
10. If a plant is releasing carbon dioxide and taking in oxygen during the day, does it
mean that there is no photosynthesis occurring? Justify your Answer. (3)
11. Give an account of small intestine. (3)
12. Discuss the path of ascent of sap. (3)
13. List various functions of food. (3)
14. Write the summary of oxygen transport in the body. (5)
15. Explain role of stomata in exchange of gases in plants. (5)
a. Answers
1. d. carbon dioxide
Explanation: Carbon dioxide is given out during expiration. When the gas
insoluble calcium carbonate.
2. b. III
Explanation: Under higher power, objects appear more magnified.
3. d. A and C
Explanation: Green plants make their own food by the process of
photosynthesis. Chlorophyll, the green pigment found in chloroplasts, traps
light energy from the sun. The plant also takes in raw materials from the
environment, water through its roots and carbon dioxide moves into the
stomata by diffusion.
4. b. Light is necessary for photosynthesis
Explanation: The covered part did not get sunlight which is necessary for
photosynthesis. So, light is necessary for photosynthesis.
5. c. Aerobic respiration
Explanation: The Krebs cycle (or citric acid cycle) is a part of cellular
respiration. Named after Hans Krebs, it is a series of chemical reactions used by
all aerobic organisms to generate energy.
6. Pulmonary vein carries oxygenated blood.
7. Mesophyll cells of leaves.
8. The filtration of blood in the nephron takes place in the glomerulus.
9. The size of RBC is 7 μm.
10. If plant is releasing carbon dioxide and taking in oxygen during the day, it means that
respiration is happening in plant. But it does not mean that photosynthesis is not
happening. Carbon dioxide released after respiration comes out of stomata. For
photosynthesis, the plant takes in carbon dioxide from atmosphere. In other words,
plant does not depend on respiration for carbon dioxide for photosynthesis.
11. Small intestine: It is the longest part of alimentary canal. It is thin walled and
highly coiled tubular structure. It is about 3-3.5 metres long and occupies most part of
abdominal cavity. It is coiled upon itself. It is differentiated into three regions, viz.
duodenum, jejunum and ileum.
Duodenum is 25 cm long C shaped. It receives the opening of bile pancreatic duct. It
also receives the opening of stomach.
Jejunum is 90 cm long. It lies above and left beyond duodenum.
Ileum is 180 cm long. Its inner lining is thrown into numerous villi. It is main part for
digestion and absorption of food.
12. Upward transport of water and dissolved inorganic salts or ascent of sap takes place
through xylem (vessels, tracheiols and xylem parenchyma). The water absorbed by
root hairs moves through cortex, passage cells and pericycle to enter the tracheary
elements of xylem. It is done either actively through suction pressure (DPD) gradient
or passively through transpiration pull. It is lifted upto the leaves as a continuous
unbroken column of water in the tracheary elements of xylem by virtue of one or
more forces such as root pressure, cohesion and adhesion of water and transpiration
pull action simultaneously. From the xylem in the leaf bundles, water moves upto the
mesophyll cells along a suction pressure gradient. The mesophyll cells lose water to
the atmosphere through stomata because of transpiration.
13. The functions of food are as follows :
a. It provides materials for the growth of the body.
b. It helps to make new materials necessary for reproduction.
c. It helps to regulate the body processes to maintain life.
d. It helps in removal of waste materials from the body.
e. It helps in repairing damaged cells and tissues.
f. It helps in maintaining body temperature.
14. Summary of oxygen (O2) transport
Inspired air (in lungs) → O2 (in alveoli of lungs)
Oxyhaemoglobin ← Oxyhaemoglobin ← Dissolved O2
(in RBC of tissue
capillaries)
(in RBC of lung
capillaries)
(in plasma of lung
capillaries)
Dissolved O2 → Dissolved O2 → O2 consumption
(in plasma of tissue
capillaries)
(in cells) (in cells)
15. Stomata are the openings located on the surface of the leaves which are guarded by
two kidney-shaped guard cells. Through stomatal opening, air can pass into or out of
leaves. Plants do not have any specialized ventilation mechanism. The exchange of
gases take place after the air enters the air spaces present in the cells. Then thin layer
of water surrounding the cells dissolves the oxygen which subsequently diffuses
across the cell wall.
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