A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
1. Acidic
2. Alkaline
3. Low refractive index
4. The absence of sugar

Water vapor comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options
1. Both processes cannot happen simultaneously
2. Both processes can happen together because the diffusion coefficient of water and CO₂ is different
3. The above processes happen only during night time
4. One process occurs during day time and the other at night

The movement of ions against the concentration gradient will be:

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull

The translocation of organic solutes in sieve tube members is supported by
1. Root pressure and transpiration pull
2. P-proteins
3. Mass flow involving a carrier and ATP
4. Cytoplasmic streaming

What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?
1. Water will flow in both directions.
2. Water will flow out of the cell.
3. Water will flow into the cell.
4. No flow of water will happen in any direction.

In plants, water moves from
1. less negative to more negative potential
2. more negative to less negative potential
3. a point to another point with the same potential
4. none of the above

Which one of the following elements in plants is not remobilised?

Which of the following facilitates opening of stomatal aperture?

1. Decrease in turgidity of guard cells

2. Radial orientation of cellulose microfibrils in the cell wall of guard cells

3. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

4. Contraction of outer wall of guard cells

What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?

1. Water will flow in both directions.

2. Water will flow out of the cell.

3. Water will flow into the cell.

4. No flow of water in any direction.