NCERT names several alien species. Say what each one harmed…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
NCERT names several alien species. Say what each one harmed.
- The Nile perch.
- The African catfish, Clarias gariepinus.
- Water hyacinth, carrot grass and Lantana.
- Which of the animals or plants above was brought for aquaculture?
Need a reminder? The key ideaShow
The evil quartet: habitat loss and fragmentation, over-exploitation, alien species invasions, co-extinctions. A piece of forest has an edge, which has the conditions of the open land, and a core. For a square piece of side with an edge of width , the core is a square of side (not in the NEET syllabus).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The Nile perch, introduced into Lake Victoria, led to the extinction of more than species of cichlid fish.
Step 2. (b) The African catfish is a threat to the native catfishes of our rivers.
Step 3. (c) The three weeds damaged the native plants and the environment.
Step 4. (d) The African catfish was brought for aquaculture.
Answer: (a) cichlids of Lake Victoria; (b) native catfishes; (c) native plants; (d) the African catfish.
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