Assertion :Phospholipids and lipids are amphipathic molecules. Reason: They have both polar and non-polar ends.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Phospholipids are major structural components of cell membranes. They are esters of fatty acids with glycerol where one fatty acid is replaced by a phosphoric acid residue (phosphatidic acid) esterified with non-nitrogenous or nitrogen containing base like choline and ethanolamine. Lecithin is choline containing phospholipid while cephalin possesses ethanolamine. Phosphoric acid and nitrogen containing base functions as polar hydrophilic head while the two fatty acids behave as hydrophobic non polar tails.

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