Which of the following pairs is incorrect?

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(B) The correct answer is $B$. $1$. $PCT$ (Proximal Convoluted Tubule) is responsible for the reabsorption of $70-80\%$ of electrolytes and water, and

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Henle's loop - Selective reabsorption in this segment is maximum

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(B) The correct answer is $B$. $1$. $PCT$ (Proximal Convoluted Tubule) is responsible for the reabsorption of $70-80\%$ of electrolytes and water, and it helps maintain the $pH$ and ionic balance of body fluids by selective secretion of $H^+$, $NH_3$ and $K^+$ ions. $2$. Henle's loop is primarily involved in the maintenance of high osmolarity in the medullary interstitial fluid. The statement that selective reabsorption is maximum in this segment is incorrect; reabsorption is maximum in the $PCT$. $3$. $DCT$ (Distal Convoluted Tubule) allows for conditional reabsorption of $Na^+$ and $H_2O$ under the influence of hormones like aldosterone and $ADH$. $4$. The Collecting duct extends from the cortex to the inner parts of the medulla and allows for the reabsorption of large amounts of water to produce concentrated urine.

$(a)$ Descending limb of Henle's loop	$(i)$ Reabsorption of salts only
$(b)$ Proximal Convoluted tubule	$(ii)$ Reabsorption of water only
$(c)$ Ascending limb of Henle's loop	$(iii)$ Conditional reabsorption of sodium ion and water
$(d)$ Distal convoluted tubule	$(iv)$ Reabsorption of ion,water and organic nutrients

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