Plant Physiology Questions

In photosynthesis, the light-independent reactions take place at:

A column of water within xylem vessels of tall trees does not break under its weight because of:

Roots play insignificant role in absorption of water in:

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

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

Oxidative phosphorylation is:

Which one of the following growth regulators is known as the 'stress hormone'?

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them?

Anoxygenic photosynthesis is characteristic of:

In which one of the following processes is ${\text{CO}}_2$ not released?

Deficiency symptoms of nitrogen and potassium are visible first in:

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?

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

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

Which of the following criteria does not pertain to facilitated transport?

During seed germination, its stored food is mobilized by:

The three boxes in a diagram represent the major biosynthetic pathways in aerobic respiration. Pathway A is Glycolysis, B is Krebs cycle, and C is ETS. Arrows represent reactants/products. Arrows 4, 8, and 12, which exit from each pathway respectively, can all represent:

A process that makes an important difference between $C_3$ and $C_4$ plants is: