Question

1(c)(i). In tabular form, state three differences between excretion in flowering plants and excretion in humans. (ii) List two organelles found in a plant cell that are responsible for the excretion of metabolic wastes.

Accepted Answer

(i) Differences:
• Humans have well-defined excretory organs (skin, lungs, liver and kidney), while flowering plants have no definite excretory organ.
• In humans, excretory products (e.g. urea, water and salt) are released at a fast rate; in plants, excretory products are released at a slow rate.
• Humans produce excretory products (urea, water, salt) in large quantities; plants produce excretory products (gums, alkaloids, resins and tannins) in small quantities.
(ii) The organelles linked to the excretion of metabolic waste in a plant cell are the mitochondria and the vacuoles.

WAEC Biology 2015 Theory — Question 3

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