What this topic covers
Define and state the significance of excretion. Relate characteristics of excretory structures (contractile vacuole, flame cell, nephridium, Malpighian tubule, kidney, stoma, lenticel) with their functions. Relate kidney structure to excretory and osmo-regulatory functions. Identify functions and excretory products of lungs and skin. Deduce the economic importance of plant excretory products (e.g., carbon (IV) oxide, oxygen, tannins, resins, gums, mucilage, alkaloids).
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