Blackman's law is related to 

(1) respiration

(2) transpiration

(3) root pressure

(4) photosynthesis.

Which of the following statements is correct?

Photorespiration shows formation of 

1. sugar but not ATP

2. ATP but not sugar

3. both ATP and sugar

4. neither ATP nor sugar.

C₄ plants have better productivity because 

(1) C₄ plants absorb more light

(2) C₄ plants absorb more CO₂

(3) C₄ plants does not carry photorespiration

(4) C₄ plants have more amount of RuBisCO.

The first carbon dioxide fixation product of C₄ plant is 

(1) Oxaloacetic acid

(2) ribulose biphosphate

(3) phosphoenol pyruvate

(4) phosphoglyceric acid.

Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is 

1. calcium oxide

2. distilled water

3. potassium hydroxide solution

4. sodium carbonate.

Which of the following is incorrect about the light reactions of photosynthesis?

1. P₆₈₀ and P₇₀₀ are the reaction centres of PS-I and PS-II respectively

2. Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II

3. NADPH is not produced in cyclic electrons transport in light reactions

4. Reactions of the two photosystems are needed for the reduction of NADP

The C4 plants differ from C3 plants with reference to the: 

1. substrate that accepts CO₂ in carbon assimilation

2. type of end product

3. type of pigment involved in photosynthesis

4. end product that will be formed 

Photosynthesis is a-
a. Biochemical process
b. Physical process
c. Chemical process
d. Physico-chemical process

Which of the following statements does not justify the importance of photosynthesis?
1. it is the primary source of all food on earth.
2. it is responsible for the release of oxygen into the atmosphere.
3. it is responsible for the water balance on earth.
4. use of energy from sunlight by plants doing photosynthesis is the basis of life on earth.