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Question

Write any four physiological adaptations found in aquatic plants.

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Solution

Adaptations found in hydrophytes. The adaptations are as follows:
(1) Hydrophytes show the low osmotic concentration of cell sap. Osmotic concentration of cell sap equal or slightly higher than that of the habitat water.
(2) Some hydrophytes possess hydathodes (water stomata) in floating hydrophytes which reduce the excessive amounts of water present in the plant body of the hydrophyte.
(3) The gases are exchanged from water through surface cells. Some CO2 evolved during respiration is stored in the air spaces which is consumed during photosynthesis and O2 evolved photosynthesis is used in respiration.
(4) The mucilaginous secretion of mucilage cells and mucilage canals around the body of the hydrophytes provides protection against friction, desiccation, decaying and microbial injuries.
(5) Flowering and fruiting are comparatively poor. They are adapted more for vegetative propagation.

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