Hi Ishika
The correct option is 1) 'Na+ reabsorption requires energy'.
Explanation
The nephron is composed of Bowman's capsule, proximal convoluted tubule, Loop of Henle and distal convoluted tubule . In distal convolutes tubule reabsorption of Na+ and water takes place which is active process i.e requires energy.
Thus, the correct answer is 'Na+ reabsorption requires energy'.
Thankyou
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