Photoperiodism was first characterised in

• tobacco

• potato

• tomato

• tomato

C₄ plants are more efficient in photosynthesis than C₃ plants due to 

• higher leaf area

• the presence of a larger number of chloroplasts

• the presence of thin cuticle

• the presence of thin cuticle

Read the following four statements, A, B,C and D select the right option having both correct statements.

A) Z scheme of light reaction takes place in presence of PS- I only.

B) Only PS-I is functional in cyclic photophosphorylation.

C) Cyclic photophosphorylation results into synthesis of ATP and NADPH₂

D) Stroma lamellae lack PS-II as well as NADP.

• B and D

• A and B

• B and C

• B and C

Kranz anatomy is one of the characteristics of the leaves of 

• potato

• wheat

• sugarcane

• sugarcane

Oxygenic photosynthesis occurs in

• Chromatium

• Oscillatoria

• Rhodospirillum

• Rhodospirillum

Which one of the following acids is a derivative of carotenoids?

• Indole butyric acid

• Indole -3-acetic acid

• Gibberellic acid

• Gibberellic acid

Cyclic-photophosphorylation results in the formation of 

• NADPH

• ATP and NADPH

• ATP, NADPH and O₂

• ATP, NADPH and O₂

The C-4 plants are photosynthetically more efficient than C-3 plants because

• the CO₂ compensation point is more

• CO₂ generated during photorespiration is trapped and recycled through PEP carboxylase

• the CO₂ efflux is not prevented 

• the CO₂ efflux is not prevented 

The slow rate of decomposition of fallen logs in nature is due to their

• low moisture content

• poor nitrogen content

• anaerobic environment around them

• anaerobic environment around them

130.

Which one of the following is resistant to enzyme action? 

• Cork 

• Wood fibre

• Pollen exine

• Pollen exine