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Read the following passage and answer the questions that follow :
Metabolic activities produce metabolic waste, which refers to by-products from the body's energy-producing processes that are unusable and potentially toxic. These wastes need removal from the body to maintain health. The wastes like urea, water, salts, ammonia, etc. are excreted via kidneys, sweat or urine. $\ce{CO2}$ is eliminated through the lungs.
(ii) Name two main toxic wastes that kidneys filter from the blood.
Metabolic activities produce metabolic waste, which refers to by-products from the body's energy-producing processes that are unusable and potentially toxic. These wastes need removal from the body to maintain health. The wastes like urea, water, salts, ammonia, etc. are excreted via kidneys, sweat or urine. $\ce{CO2}$ is eliminated through the lungs.
(ii) Name two main toxic wastes that kidneys filter from the blood.
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(i) The purpose of making urine is to filter out waste products from the blood. (1 Mark)
(ii) Urea and Uric acid. ($\frac{1}{2}$ + $\frac{1}{2}$ Mark)
(iii) (a) Amount of water reabsorbed by nephron depends on.
• Quantity of water in the body. (1 Mark)
• Quantity of dissolved waste to be excreted from the body (1 Mark)
OR
(b) The urine in summer is usually less in quantity because
• Lot of water is lost by sweating. (1 Mark)
• Water from kidney is reabsorbed to maintain the normal concentration of water in the blood. (1 Mark) (4 Marks)
(ii) Urea and Uric acid. ($\frac{1}{2}$ + $\frac{1}{2}$ Mark)
(iii) (a) Amount of water reabsorbed by nephron depends on.
• Quantity of water in the body. (1 Mark)
• Quantity of dissolved waste to be excreted from the body (1 Mark)
OR
(b) The urine in summer is usually less in quantity because
• Lot of water is lost by sweating. (1 Mark)
• Water from kidney is reabsorbed to maintain the normal concentration of water in the blood. (1 Mark) (4 Marks)