Biology
Assertion (A): Plants absorb water from the soil through a semi permeable membrane. The process is termed as osmosis.
Reason (R): The outermost layer of root hair cell is the cell wall which is semi permeable in nature, so it helps in the process of osmosis.
- Both A and R are true.
- Both A and R are false.
- A is true and R is false.
- A is false and R is true.
Transport in Plants
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Answer
A is true and R is false.
Explanation — The outermost layer of the root hair cell is the cell wall, but the cell wall is fully permeable, not semi-permeable. The cell membrane, located beneath the cell wall, is semi-permeable and is responsible for controlling the entry of water via osmosis.
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Assertion (A): The movement of molecules from their lower concentration to a higher concentration requires energy in the form of ATP.
Reason (R): Active transport is the process during which root hairs of a plant absorb minerals from the soil.
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Reason (R): Nitrogen is micronutrient, which means it is required in very small amounts by the plants. It is absorbed from the soil as a nutrient element or mineral.
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Fill in the blanks with suitable terms given below: (fast, leaves, conducting, ascent, humid)
(i) Transportation in plants is carried out by a …………… system.
(ii) The upward movement of sap that contains water and minerals is called …………… of the sap.
(iii) Transpiration is more when the wind is blowing ……………
(iv) Most water gets evaporated from the plant from its ……………
(v) Transpiration is reduced if the air is ……………
Match the terms given in Column A with those given in Column B
Column A Column B (a) Phloem parenchyma (i) Cylindrical cells devoid of a nucleaus (b) Tracheids (ii) Tubular cells forming long channels (c) Xylem vessels (iii) Cells attached to sieve tubes (d) Sieve tubes (iv) Elongated dead cells (e) Companion cells (v) Cells storing food