261.

The number of chlorophyll molecules in a quantasome is

• 50- 100

• 200- 250

• 300- 400

• 500- 600

Active K⁺ exchange mechanism for opening and closing of stomata was given by

• Darwin

• Levit

• Scarth

• Khorana

Photosynthetic bacteria have :

• pigment system I (only one pigment system)

• pigment system II

• both (a) and (b)

• some other type

Most effective wavelength of light photosynthesis is :

• green

• violet

• red

• yellow

C₄ plants, synthesis of sugars/final CO₂ fixation occurs in:

• palisade cells

• spongy cells

• undifferentiated mesophyll cells

• bundle sheath cells

Core of chlorophyll is formed by

• Fe

• Mn

• CH₃

• Mg

CO₂ acceptor in CAM plants is in :

• mesophyll cells

• bundle sheath

• both

• none of the above

The organelles, those take part in photorespiration are :

• chloroplast and mitochondria

• chloroplast, mitochondria and peroxisome

• mitochondria and peroxisome

• mitochondria only

In case of C₄ plants the acceptor of CO₂ is-

• Phosphoglyceraldehyde

• Ribulose monophosphate

• Phosphoenol pyruvate

• Ribulose diphosphate

The first step in dark reaction of photosynthesis is :

• formation of ATP

• ionization of water

• attachment of CO₂ to a pentose sugar

• excitement of electron of chlorophyll by a photon of light