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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.
RELATED QUESTIONS
Draw a magnified view of the root-hair, and describe, how it helps in the absorption of water from the soil.
How is root hair adapted for the absorption of water from the soil?
How is root hair structurally adapted for absorption of water from the soil?
Draw a cross-section of root showing association of soil particles with root hairs.
Name the following:
The kind of cells that constitute the cortex of a root.
Name the following:
Root hairs are the extension of which cells.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Xylem is the water-conducting tissue in plants.
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. |
________ type of tissues are present in epiphytic roots.
Which of the following are the components of cell wall of root hair?
