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CBSE 11th Standard Biology Subject Photosynthesis in Higher Plants HOT Questions 2 Marks Questions With Solution 2021

Published on: 29/05/2021

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Std: 11th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue region of ? spectrum of light?

Tomatoes, carrots and chillies are red in colour due to the presence of one pigment? Is it a photosynthetic pigment?---M---G1---

How does water stress affect/decrease the rate of photosynthesis

Dark reactions are dependent on light yet are called dark reactions. Justify.

Why is the lumen of thylakoids acidic while, the stroma is alkaline in nature?

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Answers Key:

Generic 2

5 x 2 = 10

The wave length of light: the visible light lies between the wave lengths of UV and IR. The most efficient is red light for photosynthesis. Green lights less effective. Maximum photosynthesis takes place in red and blue regions of spectrum of light. Chl a and b absorb mostly blue and red light.

The pigments are chromoplasts; these are fat soluble carotinoid pigments like carotenes and xanthophylls. These are called accessory pigments; they absorb light and transfer energy to Chlorophyll a.

(a) Water stress causes closure of stomata and decreases the availability of CO₂ for photosynthesis.
(b) Water stress also causes wilting of leaves, thus reducing the surface area of leaves for metabolic function.

Dark reactions are dependent on the products of light reaction that are ATP and NADPH to carryout reduction of CO₂ to form glucose. This does not need so, they are called dark reactions.

The acidic nature of lumen of thylakoids is due to the accumulation of protons by the photolysis of water. The same reaction does not occur in stroma so, it is basic in nature.