CBSE 2024 · Region 1 · Set 2 · Q21 · 2 marks
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.
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.
Organisms and PopulationsPopulationsUnderstandvery_short_answermedium
More from Organisms and Populations
- Study the given graphs (X) and (Y) depicting the annual variation in solar radiation on Earth from January to…2022 · asked 3×
- (i) Describe the population growth curve applicable in a population of any species in nature that has limited…2025 · asked 3×
- Read the following passage and answer the questions that follow: In nature, we rarely find isolated, single…2025 · asked 3×
- (i) Describe the Species-Area relationship as observed by Alexander von Humboldt, for a wide variety of taxa…2025 · asked 3×
- What is the carrying capacity of a species in a habitat? Explain the growth curve that takes this capacity…2026 · asked 3×
- (i) Write the observations made at the end of Connell's field experiment on barnacles on the rocky sea coasts…2022 · asked 3×
- The diagram below shows the distribution of two barnacle species, Chthamalus and Balanus on a rocky sea…2026 · asked 3×
- The graphs given below, A and B, represent population of elephants in two different National Parks (a…2022 · asked 3×
CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.