Addition of a solute to pure water causes

Solution

The pure water, at atmospheric pressure has zero water potential. The addition of any solute particles reduces the free energy of water. Thus, the water potential will be negative.

Transpiration ratio is the ratio of moles of H₂O transpired/moles of CO₂ fixed. This ratio is measure of

The efficiency of guard cells on stomatal movement
Effectiveness of stomata is maximizing photosynthesis while minimizing water loss
Distinguishing a xerophyte from a glycophyte
Stomatal pore size of the leaves

When stomata open, the pH of guard cells

Which of the following helps in the absorption of water and mineral salts?

Solution

In mycorrhiza, fungal members help in absorption of mineral and water.

Transpiration facilitates

In both transpiration and evaporation water is lost in the form of vapour yet they differ, because

Both transpiration and evaporation are similar but the rate of water loss differs
Frequency of water loss is different in both of them
Transpiration is a physical process and evaporation is a physiological process
Transpiration is a physiological process and evaporation is a physical process

Solution

Transpiration occurs in plants, only from living cells.Evaporation occurs from any free surface. i.e., both from living and non-living surfaces.

Which of the atmospheric factor act as anti-transpirant:

Movement of ions or molecules in a direction opposite to that of prevailing electro chemical gradient is known as

The spray of Phenyl Mercuric Acetate (PMA) causes :

Which of the following wall of guard cells is thick?

UnAttempted

0

Attempted

Correct

Wrong