to pure water or a solution?
& (a) With the help of well-labelled diagrams, describe the process of plasmolysis
in plants, giving appropriate examples.
(b) Explain what will happen to a plant cell if it is kept in a solution having
ic pressure is applied
1. What hap
higher water potential.
Answers
Explanation:
Question 1: How is root hair structurally adapted for absorption of water from the soil ?
Answer: (i) The root hair represents a large surface area in contact with the soil particle.
(ii) The minute root hair can penetrate between the soil particles and when it comes in contact with soil water, the cell membrane allows efficient entry of water into the root.
(iii) The cytoplasm and the vacuoles also help in this water absorption by osmosis.
ICSE Solutions for Class 10 Biology - Absorption by Roots 1
Question 2: Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
Answer: When fertilizers are added to the moist soil around it, it will form hypertonic solution, resulting the protoplasm to shrink and plasma membrane withdraw itself from the cell wall. Hence, the root hairs also become limp or flaccid.
Question 3: What do you mean by transpiration pull ?
Answer: Transpiration pull: As the water is lost from the leaf surface by transpiration, more water molecules are pulled up due to the tendency of water molecules to remain joined (cohesion), and thus- to produce a continuous column of water through the stem. This phenomenon is known as transpiration pull.
Question 4: Define the Cohesive and Adhesive forces.
Answer: Cohesive Force: The force produced by the molecular attraction between water particles.
Adhesive Force: The force of attraction between the molecules of unlike bodies that act to hold them together is called adhesive force.
Answer:
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