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Biology · 2024 · 2 marks
CBSE 2024 · Region 1 · Set 2 · Q21
A specific plant species was introduced into Australia in 1920 and later it became invasive spreading over millions of hectares of rangeland. (a)…
A specific plant species was introduced into Australia in $\displaystyle 1920$ and later it became invasive spreading over millions of hectares of rangeland.
(a)
Name the plant that was introduced into Australia and mention the reason for its uncontrollable growth.
(b)
State how its spread was eventually brought under control.
Marking-scheme solution
(a)
-Prickly pear cactus / Opuntia
-Being exotic species it become invasive as it did not have any natural predators.
(b)
By introducing cactus feeding predator (a moth) from its natural habitat.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.