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(a) List any two factors on which the amount of water reabsorbed from the filtrate depends in the human kidneys.
(b) Write any two methods used by plants to get rid of excretory products.
(b) Write any two methods used by plants to get rid of excretory products.
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(a)
• Amount of water in the body (1)
• Amount of dissolved wastes that need to be excreted. (1)
(b) Plants use different methods for excretion
• Some of their wastes are stored in dead tissues
• Many plant waste products are stored in cellular vacuoles
• Waste products may be stored in leaves that fall off
• Other waste products like resins or gums are stored in old xylem (Any two points) (½+½)
• Amount of water in the body (1)
• Amount of dissolved wastes that need to be excreted. (1)
(b) Plants use different methods for excretion
• Some of their wastes are stored in dead tissues
• Many plant waste products are stored in cellular vacuoles
• Waste products may be stored in leaves that fall off
• Other waste products like resins or gums are stored in old xylem (Any two points) (½+½)