Give reasons.
Always vasopressin is not secreted.

a) The urine gets concentrated by reabsorption of water. b) Vasopressin is secreted only when concentrated urine is to be passed out

Give reasons for the diagonal relationship observed in the periodic table .

Give reasons Why is it not possible to demonstrate respiration in green plant kept in sunlight?

Fill in the blanks and give reason: Green plants are……………….in nature.

Give reasons. Small intestine is similar to a coiled pipe.

Give reasons for use of X rays in the study of solids.

Give reasons. Small intestine is similar to a coiled pipe.

Give reasons. Urine is slightly thicker in summer than in winter.