Plant Physiology Questions

CAM helps the plants in:

In the leaves of $C_4$ plants, malic acid formation during ${\text{CO}}_2$ fixation occurs in the cells of:

The wavelength of light absorbed by $P_r$ form of phytochrome is:

"Foolish seedling" disease of rice led to the discovery of:

Which one of the following pairs, is not correctly matched?

Two cells A and B are contiguous. Cell A has osmotic pressure $10\text{atm}$, turgor pressure $7\text{atm}$ and diffusion pressure deficit $3\text{atm}$. Cell B has osmotic pressure $8\text{atm}$, turgor pressure $3\text{atm}$ and diffusion pressure deficit $5\text{atm}$. The result will be:

Which one of the following elements is not an essential micronutrient for plant growth?

A plant requires magnesium for:

During seed germination, its stored food is mobilized by:

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?

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

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:

Root pressure is usually developed due to:

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

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

Roots play insignificant role in absorption of water in:

Oxidative phosphorylation is:

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

The avena curvature is used for bioassay of:

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

A few drops of sap were collected by cutting across a plant stem. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

Phytochrome is a:

Which is essential for the growth of root tip?

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

Gibberellins can promote seed germination because of their influence on:

Which one of the following is NOT a micronutrient?

The atmospheric concentration of $C{O}_2$ at which photosynthesis just compensates for respiration is referred to as $C{O}_2$ compensation point.

In germinating seeds, fatty acids are degraded exclusively in the:

${\text{C}}_4$ plants are photosynthetically more efficient than ${\text{C}}_3$ plants because:

Rupture and fractionation of the water column do not occur during the ascent of sap because of:

In leaves of ${\text{C}}_4$ plants, malic acid synthesis during ${\text{CO}}_2$ fixation occurs in:

The importance of day length in flowering of plants was first shown in:

Substrate oxidation without an external electron acceptor is called:

Electrons from excited chlorophyll molecules of Photosystem II are accepted first by:

Manganese ($\text{Mn}$) is required in:

One of the synthetic auxins is:

Aerobic respiratory pathway is appropriately termed:

Guard cells help in:

Which one of the following acids is a derivative of carotenoids?

The best defined function of Manganese in green plants is:

An element playing an important role in nitrogen fixation is:

${\text{C}}_4$ plants are more efficient in photosynthesis than ${\text{C}}_3$ plants due to:

$\text{PGA}$ as the first ${\text{CO}}_2$ fixation product was discovered in photosynthesis of:

The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called:

Photoperiodism was first characterised in:

Which one of the following is essential for photolysis of water?

In Kranz anatomy, the bundle sheath cells have:

Guttation is the result of:

Which one of the following is not an essential mineral element for plants?

Read the following four statements (A – D):(A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.(D) Symbiotic nitrogen-fixers occur in free-living state also in soil.How many of the above statements are right?

Which one of the following is correctly matched?

The correct sequence of cell organelles during photorespiration is: