🌱 Environment & EcologyUPSC 2011Sustainable Development

If a tropical rainforest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because

aThe soil of rainforest is deficient in nutrients
bPropagules of the trees in a rainforest have poor viability
cThe rain forest species are slow-growing
dExotic species invade the fertile soil of rainforest
✓ Correct answer: a) The soil of rainforest is deficient in nutrients
ExplanationTropical rainforests and tropical deciduous forests dif- fer in their nutrient cycles, soil composition, and regenera- tion capacity.When a tropical rainforest is removed, it does not regenerate quickly because of the nutrient-poor soil.In trop- ical rainforests, the warm and humid conditions promote rapid decomposition of organic matter by bacteria and fungi.But due to the high density of plant life the nutrients released are im- mediately absorbed by plants leaving the soil infertile.In contrast the tropical deciduous forests have richer soils be- cause the leaf litter decomposes and replenishes soil nutrients more effectively.Options (b), (c) and (d) are incorrect:Propagules (seeds, spores, or other reproductive structures) of rainforest trees generally have high viability.However, the regeneration of rainforests is hindered more by soil nutrient deficiencies than by the viability of propagules.Many rainforest species are fast-growing especially pioneer species that colonize disturbed areas.However, the lack of nutrients in the soil limits their growth and the overall

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