Which of the following is an example of excretion in plants?
Correct answer: D. Carbon dioxide produced in respiration diffuses out of leaves by stomata
- A. Flowering plants release chemicals that attract pollinators
- B. A plant releases acid from its roots to destroy competing species
- C. Auxins produced in the apical cells diffuse into the zone of elongation
- D. Carbon dioxide produced in respiration diffuses out of leaves by stomata
Explanation
The correct answer is Option D. Excretion in plants involves the removal of waste products. Carbon dioxide is a by-product of respiration, and when it diffuses out of the leaves via the stomata, it is considered an excretory process. Option A is incorrect because attracting pollinators is a reproductive strategy, not excretion. Option B is incorrect because releasing acid to inhibit other plants is allelopathy, not excretion. Option C is incorrect because auxin movement is related to growth regulation, not the removal of waste.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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