131.

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

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

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

• Lysosome

• Ribosome

• Chloroplast

• Chloroplast

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

• Light saturation for CO₂ fixation occurs at 10% of full sunlight

• Increasing atmospheric CO₂ concentration upto 0.05% can enhance CO₂ fixation rate

• C₃ plants responds to higher temperatures with enhanced photosynthesis while C₄ plants have much lower temperature optimum

• C₃ plants responds to higher temperatures with enhanced photosynthesis while C₄ plants have much lower temperature optimum

Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in :

• C₃ plants

• C₄ plants

• C₂ plants

• C₂ plants

Which of the following is not a product of light reaction of photosynthesis?

• ATP

• NADH

• Oxygen

• NADPH

Stomata in grass leaf are

• Dumb-bell shaped

• Kidney Shaped

• Barrel shaped

• Rectangular