CBSE 2025, Set 1

Question

"Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of biodiversity." Justify by taking one example for each.

Edvaya · Accepted Answer

The correct answer is Subjective. **SOLUTION** * **Alien species invasion:** The introduction of the Nile perch into Lake Victoria in East Africa led to the extinction of over 200 species of native cichlid fish. Another widespread example is the severe threat posed to native species by invasive weeds like carrot grass (*Parthenium*) or water hyacinth (*Eichhornia*). * **Habitat loss and fragmentation:** When large, contiguous habitats are broken up into small fragments due to human activities, mammals and birds requiring large territories are heavily impacted, leading to population decline. For example, the Amazon rainforest, which harbours millions of species, is being systematically cut and cleared for the cultivation of soya beans or conversion into grasslands for raising beef cattle.

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Biology > Human Welfare Biotech And Ecology > Biodiversity And Conservation

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