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

165.

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

Sugarcane show high efficiency of CO₂ fixation because of :

• Calvin cycle

• Hatch and Slack cycle

• TCA cycle

• greater sunlight

Photosynthetic unit is :

• glyoxysome

• spherosome

• microsome

• quantasome

The photorespiratory carbon-oxidation cycle involves the interaction of

• chloroplast

• mitochondria

• peroxisomes

• all of these

Assertion : The collenchyma is a thick walled living tissue.

Reason : The collenchyma is thickened due to the deposition of pectin.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : When six molecules ofcarbon dioxide participate in photosynthesis, 12 molecules of NADP and 18 ATP are used up, forming one hexose molecule. 

Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both the assertion and reason are false.