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SUBJECTIVE

Marks Level

Q1. Deep in the ocean, sunlight can hardly reach, yet there are plants 1 E
such as brown and red algae found here. How do you think they are
able to synthesise their food?

Q2. Why should we destarch a leaf before conducting an experiment to 1 E
show that light is necessary for photosynthesis

Q3. Can plants use an artificial source of light (tube light) for preparing 3 Av
food? Give reason. .

Q4. a. Identify the following process. 3 Av
b. Label B and C and write their sources
c. Write the role of B in the process of photosynthesis.
d. What will happen to the plant in the absence of ‘B’? Explain.

Q5. a. A person observes that some plants have deep red, violet 3 D
and brown coloured leaves. Can these leaves carry out
photosynthesis? Give reason for your answer.
b. What is role of chlorophyll in the process of photosynthesis?
c. What are the products produced during photosynthesis?
What happens to them?

Q6. The plant X is found in abundance in desert areas which get meagre 3 D
rainfall. The modified leaves of this plant can reduce the loss of
water from this plant by transpiration. This plant has long roots
which go deep into the soil so as to obtain water.

a. What could be the plant X be?
b. Which part/parts of this plant take part in the process of
photosynthesis?