Question

Root pressure generates

A) Positive pressure

B) Push to water column in herbs

C) Ascent of sap in tall trees

(1) A and B

(3) A and C

(2) B and C

(4) A Only​

Answer 1

Answer:The answer is

1) A and B

Explanation:

Root pressure is the positive pressure that develops in the roots of plants by the active absorption of nutrients from the soil and when various ions from the soil are actively transported into the vascular tissues of the roots, water also follows. This increases the pressure inside the xylem. This positive pressure is called root pressure. The root pressure can push water up to small heights in the stem.

Answer 2

Answer:

Root pressure generates positive pressure and also the ascent of sap in tall trees. The correct option is (3)

Explanation:

• If the stem of a well-watered herbaceous plant is cut off just above the soil, xylem sap will exude from the cut surface. Exudation of the sap indicates the presence of positive pressure in the xylem. The magnitude of this pressure can be measured by attaching a manometer to the cut surface. This pressure is known as root pressure.
• Root pressure is most likely to occur when the soil water potentials are high and transpiration rates are low.
• The upward movement of minerals and water against the gravitational force from root to aerial parts of the plant through the xylem is known as the ascent of sap.

Hence, the correct option is (3)