Which of the following statements about phytochrome is true?

1. P_r absorbs yellow light and becomes P_fr 

2. P_r absorbs red light and becomes P_fr 

3. P_fr absorbs red light and becomes P_r 

4. P_fr absorbs yellow light and becomes P_r .

Blackman's law is related to 

(1) respiration

(2) transpiration

(3) root pressure

(4) photosynthesis.

Who discovered photophosphorylation?

(1) Arnon et. al.

(2) Von Mayer

(3) Clavin et.al.

(4) Hill

Photosynthetic bacteria do not contain

(1) quantasome

(2) PS-I and PS-II

(3) PS-I

(4) PS-II.

The photorespiratory carbon-oxidation cycle involves the interaction of

1. chloroplast

2. mitochordria

3. peroxisomes

4. all of these.

Photorespiration in C₃ plants starts from:

(1) phosphoglycerate

(2) phosphoglycolate

(3) Glycerate

(4) glycine.

Hill reaction occurs in:

(1) high altitude plants

(2) total darkness

(3) absence of water

(4) presence of ferricyanide

Which one of the following categories of organisms do not evolve oxygen during photosynthesis?

(1) Red algae

(2) Photosynthetic bacteria

(3) C₄ plants with Kranz anatomy

(4) Blue green algae

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