Question

Give reasons for the following-
1-transpiration helps in ascent of sap.
2.Water column is maintained inside xylem vessels

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Answer 1

Explanation:

1. According to 'Imbibition theory' (Sachs 1879), water moves upward in the stem through the imbibition activity of the walls of the xylem vessels, which is thought to be responsible for the ascent of sap.
2. Water column in xylem vessels are constantly maintained due to cohesion and transportation pull theory. As the xylem vessels are connected to each other, it allows water to stay in a continuous column to the mesophyll cells from the root hairs. Lignin and cellulose of xylem have strongly adhered water.

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Answer 2

Explanation:

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