Which of the following statement about conifers is correct?
Correct answer: D. Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
- A. Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
- B. Accumulate waste in leaves, which fall in autumn.
- C. Production of black wood in the center.
- D. Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
Explanation
Conifers can release certain chemical wastes into the soil through their roots, and some of these substances may inhibit competing plants, a form of chemical defence. The likely distractor is black wood at the centre, but that describes heartwood formation and is not the characteristic excretory process stated here.
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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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