Which of the following is the characteristic of PS-I?

(1) It is activate only upto 680 nm of light.

(2) The reaction centre of PS-I is P₆₈₀ . 

(3) PS-I is reduced by the electrons released in photolysis of water.

(4) PS-I is involved in non-cyclic photophosphorylation.

Cyclic photophosphorylation invloves

(1) PS I

(2) PS II

(3) PS I and PS II

(4) P₆₈₀

The first stable product of Calvin cycle is 

(1) 3-phosphoglycerate

(2) 1, 3 biphosphoglycerate

(3) glyceraldehyde - 3 phosphate

(4) ribulose - 5- phosphate

PS-II occurs only in

(1) stroma

(2) granal thylakoids

(3) stromal lamella

(4) matrix

Which of the following statements is correct?

(1) Photorespiration is useful process.

(2) C4 plants are more efficient than C3 plants.

(3) C4 plants are less efficient than C3 plants.

(4) Photorespiration is absent in C3 plants but present in C4 plants. 

Photorespiration shows formation of 

1. sugar but not ATP

2. ATP but not sugar

3. both ATP and sugar

4. neither ATP nor sugar.

Kranz anatomy is usually associated with 

(1) C₃ plants

(2) C₄ plants

(3) CAM plants

(4) C₃-C₄ intermediate plants.

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.