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

Which one of the following is resistant to enzyme action? 

• Cork 

• Wood fibre

• Pollen exine

• Pollen exine

In the leaves of C₄ plants, malic acid formation during CO2 fixation occurs in the cells of

• mesophyll

• bundle sheath

• phloem

• phloem

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is

• cytochrome

• iron-sulphur protein

• ferredoxin

• ferredoxin

A plant requires magnesium for

• holding cells together

• protein synthesis

• chlorophyll synthesis

• chlorophyll synthesis

In photosystem-I, the first electron acceptor is

• Ferredoxin

• Cytochrome

• Plastocyanin

• Plastocyanin

30.

During photorespiration, the oxygen-consuming reaction(s) occur in

• stroma of chloroplasts and mitochondria

• stroma of chloroplasts and peroxisomes

• grana of chloroplasts and peroxisomes

• grana of chloroplasts and peroxisomes