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Question
Give reason for the following:
If you uproot a plant from the soil, its leaves soon wilt.
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Solution
If a plant is uprooted, the leaves continue to lose water through transpiration, but there is no more water absorbed by the roots. This does not allow compensation for the loss of water by transpiration; hence, the leaves of the uprooted plant will wilt soon.
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RELATED QUESTIONS
Explain the mechanism of closing and opening of the stomata.
The alongside diagram A shows a root hair growing through the soil particles. Diagram B is the root hair of an aquatic plant.
(i) Name the parts 1,2,3.
(ii) Name two substances which enter the root hair. What are their uses?
(iii) By what process do these substances enter the root hair?
(iv) Account for the different shapes of root hairs in the two diagrams.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Diffusion | (a) The exit or flow of water from the cell to the outer environment. |
| (ii) Xylem | (b) The shrinkage of protoplasm when the cell is kept in a hypertonic solution. |
| (iii) Root pressure | (c) The tissue through which water and mineral salts move upward in a plant. |
| (iv) Isotonic solution | (d) Two solutions which have equal osmotic pressure. |
| (v) Exosmosis | (e) The process by which the molecules of perfume spread in the room when the bottle is open. |
| (vi) Osmosis | (f) The process by which roots absorb water from the soil. |
| (vii) Plasmolysis | (g) The pressure by which water rises up to some feet in a lofty tree. |
| (viii) Hypotonic solution | (h) The concentration of the solution when lower than that of the cell sap. |
Multiple Choice Question:
The most widely accepted theory for ascent of sap is ______.
Draw a neat and labelled diagram of Root hair.
Water which is absorbed by roots is transported to aerial parts of the plant through ______
Epiphytic plants like orchids absorb water vapours from air with the help of epiphytic roots having special tissue called ____________.
Which of the following are the components of cell wall of root hair?
The tubular, colorless delicate prolongations of epidennal cells are seen in which region of root in plants?
Draw a neat and proportionate diagram of root hair and label mitochondria, nucleus and vacuole.
