If a pressure greater than atmospheric pressure is applied to a solution, its water potential:

1. Increases

2. Decreases

3. Remains same

4. Becomes zero

Water movement in plants is:

1. Down a potential gradient in apoplast and up the potential gradient in symplast

2. Down a potential gradient in symplast and up the potential gradient in apoplast

3. Up the potential gradient in both apoplast and symplast 

4. Down the potential gradient in both apoplast and symplast 

What per cent of water reaching them is used by leaves in photosynthesis?

1. Less than 1%
2. About 5 %
3. About 5 % in warm conditions and about 10 % in cold conditions
4. About 50 %

Attraction of water molecules to polar surfaces [such as the surface of tracheary elements] is called as:

1. Connation

2. Adnation

3. Cohesion

4. Adhesion

What are the control points where a plant adjusts the quantity and types of solutes that reach the xylem?

1. Suberin deposited casparian strips

2. Transport proteins of endodermal cell

3. Sclerenchyma around the pericycle

4. The root hairs themselves

Consider the following two statements:

I. The direction of movement in the phloem is bi-directional.

II. The source-sink relationship in plants is variable.

1. Both I and II are correct and II explains I

2. Both I and II are correct but II does not explain I

3. I is correct but II is incorrect

4. Both I and II are incorrect 

During translocation of sugars in plants from source to sink:

1. The loading of sugar at source is by active transport and unloading at the sink by passive transport.

2. The loading of sugar at source is by passive transport and unloading at the sink by active transport.

3. Both loading at the source and unloading at the sink are by active transport.

4. Both loading at the source and unloading at the sink are by passive transport.

During plasmolysis:

1. Water is lost from the cytoplasm but not from the vacuole

2. Water is first lost from the cytoplasm and then from the vacuole

3. Water is first lost from the vacuole and then from the cytoplasm 

4. Water is lost from the vacuole but not from the cytoplasm 

Which of the following is/are essential for imbibitions to take place?

I. Water potential gradient between the absorbent and the liquid imbibed

II. Affinity between the adsorbent and the liquid

1. Only II

2. Only I

3. Both I and II

4. None

Consider the following:

I.    A decrease in pressure on cell exerted by the wall
II.   An increase in water potential of the surroundings
III.  The uptake of solutes by the cell
IV.  An increase in the tension on the surrounding solution

Which of these would contribute to the uptake of water by the cell?

1. I, II, III

2. II, III, IV

3. I, II, IV

4. I, III, IV