1.

Assertion : Ca^(++) and K^(+) ions are responsible for maintaining proper osmotic pressure balance in the cells of organism. Reason : Solutions having the same osmotic pressure at same temp are called isotonic solutions.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If asserrion is false but reason is true.

SOLUTION :Sodium ION, `Na^(+)` and potassium ion, `K^(+)` are responsible for maintaining proper osmotic pressure balance inside and OUTSIDE of the CELLS of organisms.


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