Question

Water rises in the stem due to
A. Cohesion and Transpiration pull
B. Turgor pressure
C. Osmosis pressure
D. None of the above

Answer 1

Hint: In the xylem and phloem vessels in which substances conduct from one part to another. Phloem conducts food from leaves to other parts of plants and xylem conducts water and minerals from soil to other parts of the plant.

Complete step-by-step answer:
In a xylem vessel water travels against the gravity so what is the driving force that helps the water to move against the gravity. The answer is Transpiration pull and cohesion.
Transpiration pull: Due to the heat of the sun plant also show the evaporation process. Like we suck the juice from similar sun sucks water from plant stomata and lenticel. This suction helps the water to travel against the gravity.
Cohesion: In xylem vessels, water molecules form a chain due to mutual attraction between water molecules, this mutual attraction known as cohesion.
So, the correct option is (A).

Additional information:
Transpiration pull has one big disadvantage that maximum water absorbed by soil is lost during the transpiration process due to this in hot and dry days there is more chance of death of plants due to deficiency of water. In desert plants have some adaptation that helps plants to prevent death due to transportation. Desert plants have small leaves and in some desert plants leaves are modified into spines like in cactus. In the cactus plant, the process of photosynthesis is performed by the stem, and the stem stores water and food so the stem is fleshy. In desert plants mostly leaves have a coating of a waxy layer of cutin known as a cuticle that prevents water loss due to transpiration. Desert plants have long roots to go deep to get underground water.

Note: Stomata is an opening present in leaves and green stem from where gases exchange and water evaporation takes place and lenticel is lens type opening in the bark of a tree from where gases exchange and water evaporation takes place.