Assertion: When water has to be conserved in the body, ADH is secreted from the posterior pituitary.
Reason: ADH renders the walls of DCT, collecting duct and tubule impermeable to water.
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Solution
Correct option: (b) If both assertion and reason are true then the reason is not the correct explanation of assertion.
ADH hormone is secreted by the pituitary gland which increases the permeability of water in distal convoluted tubules and collecting duct for reabsorption.