Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following characteristics are associated with hydrophytes? (1) Water and mineral nutrients are absorbed through general body surface (2) Osmotic concentration or osmotic potential of cell is equal to or slightly higher than external water (3) Presence of weak and negatively geotropic roots (4) Presence of mucilage to hold waterA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Hydrophytes are the aquatic plants growing in water. These possess following physiological adaptations. (i) Water and mineral nutrients are absorbed through general body surface. (ii) Osmotic concentration or osmotic potential of cell is equal to or slightly higher than external water. Negatively geotropic respiratory roots (pneumatophores) are found in halophytic (mangrove) plants. Presence of mucilage in fleshy organs to hold water is a characteristic of xerophytic plants.
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