Plant Physiology

The first stable product of fixation of atmospheric nitrogen in leguminous plants is ?

• NO3^-

• Glutamate

• Ammonia

• NO2^-

Which of the following biomolecules is common to respiration - mediated breakdown of fats , carbohydrates , and proteins?

• Fructose 1-6 bisphosphate

• Pyruvic acid

• Acetyl CoA

• Glucose 6 - phosphate

Phytochrome is a

• Glycoprotein

• Lipoprotein

• Chromoprotein

• Flavoprotein

In photosynthesis , the light independent reactions takes place at:

• Photosystem- II

• Stromal matrix

• Thylakoid lumen

• Photosystem-I

During biological nitrogen fixation , inactivation of nitrogenase by oxygen poisoning is prevented by?

• Carotene

• Cytochrome

• Leghaemoglobin

• Xanthophyll

Water soluble pigment found in plant cell vacuoles are;

• Chlorophylls

• Carotenoids

• Anthocyanins

• Xanthophylls

A plant in your garden avoids photorespiratory losses , has improved water use efficiency , shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

• C₄

• CAM

• Nitrogen fixer

• C₃

Emerson's enhancement effect and Red drophave been instrumental in the discovery of ?

• Two photosystems operating simultaneously

• Photophosphorylation and cyclic electron transport

• Oxidative photophosphorylation

• Photophosphorylation and non - cyclic electron transport

In a chloroplast the highest number of protons are found in;

• Lumen of thylakoids

• Inter membrane space

• Antennae complex

• Stroma

The process which makes major difference between C₃ and C₄ plants is ;

• Calvin cycle

• Photorespiration

• Respiration

• Glycolysis