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प्रश्न
How is root hair adapted for the absorption of water from the soil?
उत्तर
The main root with its many branches form a network in the soil. The root hairs get entangled in the soil particles and remain in close contact with the capillary water surrounding the soil particles. The epidermal cells of root hairs have vacuoles which contain cell sap. Generally, the cell sap is more concentrated than the soil solution. As a result the water enters inside the root hair cells by endosmosis. This water dilutes the epidermal cell sap solution. Then water enters into the cortical cells by osmosis and reaches the endodermal cells and then pericycle cells. From this layer water then enters in the xylem tissue. In this way, the water is absorbed and translocated up to xylem of the root by osmosis.
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संबंधित प्रश्न
What are root hair? Mention the function performed by the root hair.
What part is played by The cytoplasm in the uptake of water into the root hair?
Choose the correct answer:
Which one is semi-permeable?
Study the experimental setup in the figure and then answer the question that follow.
What will you observe in the setup after about half an hour? Give reasons for your answer.
Name the following:
The kind of cells that constitute the cortex of a root.
Plasma Membrane is ______.
What is the composition of inner layer of root hair?
Which part of the root helps in the maximum absorption of water and minerals?
Look at Figure 11.1. Draw another figure of the same set-up as would be observed after a few hours.
Explain about the factors that affect water absorption.
