Root Pressure

Q.

Assertion : Root pressure can provide a modest pull in the overall water transport in plants.

Reason : It does play an important role in water movement in tall trees.

1. if both A and R are true and R is the correct explanation of A

2. if both A and R are false.

3. if both A and R are true but R is not the correct explanation of A

4. if A is true but R is false

Q.

What role does root pressure play in water movement in plants?

Q. Which of the following is a wrong match?

1. Apoplast – system of adjacent cell walls
2. Symplast - system of inter connected protoplasts
3. Mycorrhiza – symbiotic association of alga and fungus
4. Root pressure – guttation

Q.

Water moves up against gravity and even for a tree of 20 m height, the tip receives water within two hours.The most important physiological phenomenon which is responsible for the upward movement of water is

1. adhesive forces

2. transpiration pull

3. root pressure

4. Cohesive forces

Q. Root pressure develops due to:

1. Increase in transpiration
2. Active absorption
3. Low osmotic potential in soil
4. Passive absorption

Q. Go through the four statements given beIow:
I. Root pressure provides a light push in the overall process of water transport.
II. Most plants meet their water need by transpiration pull.
III. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecule in the xylem vessel which often break under enormous tension created by transpiration.
IV. Guttation is the cause of transpiration pull.

The correct statements are

1. I, II, 111, IV
2. I, II, Ill
3. II, Ill, IV
4. II, Ill

Q. Rearrange the following zones seen in the root and choose the correct option.
(A) Zone of meristematic activity
(B) Root cap zone
(C) Zone of maturation
(D) Zone of elongation

1. A, B, C, D
2. B, A, D, C
3. C, D, B, A
4. D, C, B, A

Q. In the given T.S of root, what are part A, B and C?

1. A- Vacuolar path, B- membrane pathway, C-Casparian strips
2. A- Transmembrane, B- Capillary, C- Endodermis
3. A- Symplast, B- Apoplast, C- Casparian strip
4. A- Apoplast, B-Symplast, C- Endodermis

Q. The following is/are exclusively associated with the pulling of water in vessels by creating a negative pressure, except:

1. Cohesion and adhesion
2. Root pressure
3. Capillarity and tensile strength
4. Transpiration