Question

why osmotic pressure is highest in halophytes and lowest in hydrophytes?

Answer 1

Halophytes are plants that live in marshy areas. They have to absorb water from such a soil which has higher salt concentration and therefore lower water potential (higher osmotic pressure). To cope up with this situation they activate salts in their roots. As a consequence, the cells of the roots develop lower water potential (higher osmotic pressure) which brings in water by osmosis.
Hydrophytes live in water so they have less concentration of salts in them means less osmotic pressure.

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Answer 2

Osmotic pressure is hisghest in halophytes and lowest in hydrophytes

Explanation:

• Halophytes live in conditions which are physiologically dry. The water is present in highly concentrated salt solution. Hence, to absorb water, halophytes maintain very high osmotic pressure in their cells. The cell sap should be more concentrated as compared to the environment, then only halophytes can absorb water.
• the cells of the root develop water potential which bring more osmosis and the salt in exceed form stored in cells on leaves.
• Hydrophytes live in water so they have less concentration of salts in them means less osmotic pressure.