The first carbon dioxide fixation in C₄ pathway occurs in chloroplasts of

• guard cells

• mesophyll cells

• bundle sheath cells

• epidermal cells

Sunken stomata occur in

• xerophytes

• hydrophytes

• mesophytes

• opsanophytes

Plants purify air by which process?

• Photorespiration

• Photosynthesis

• Photophosphorylation

• Transpiration

Chemiosmotic theory of ATP synthesis, in the chloroplast and mitochondria, is based on :

• proton gradient

• membrane potential

• accumulation of K ions

• accumulation of Na ions

Dimorphism of chloroplast is found in

• C₃ - plants

• C₄ - plants

• CAM plants

• Both (b) and (c)

The order of occurrence of the cytochromes in the F₁ particle is

• cyt-b, cyt-c, cyt-a-cyt a₃

• cyt-c, cyt-b, cyt-a-cyt a₃

• cyt-a, cyt-b, cyt-c-cyt a₃

• cyt-a₃, cyt-a, cyt-c-cyt b

Photorespiration in C₃ -plants starts from :

• glycine

• glycerate

• phosphoglycolate

• phosphoglycerate

From which of the following, photosynthetic autotrophs receive their energy?

• Heat

• Inorganic chemicals

• Organic chemicals

• Light

CO₂ acceptor in C₃ cycle is

• OAA

• RuBP

• PEP

• Malic acid

Which of the following is photophosphorylation?

• Production of ATP from ADP

• Production of NADP

• Synthesis of ADP from ATP

• Production of PGA