For each case, name the cause of the loss of biodiversity: habitat loss and fragmentation…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
For each case, name the cause of the loss of biodiversity: habitat loss and fragmentation, over-exploitation, alien species invasion, or co-extinction.
- A fish is put into an African lake, and more than species of cichlids vanish.
- Rain forest is cleared for soya beans.
- The last passenger pigeons are shot.
- A fish becomes extinct, and the parasites that lived only on it vanish too.
- A highway cuts a forest in two, and animals that need large territories decline.
- Lantana spreads over the grassland and kills the native herbs.
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) Alien species invasion. The Nile perch is the invader.
Step 2. (b) Habitat loss.
Step 3. (c) Over-exploitation.
Step 4. (d) Co-extinction.
Step 5. (e) Fragmentation, which is part of the first cause.
Step 6. (f) Alien species invasion.
Answer: (a) alien species; (b) habitat loss; (c) over-exploitation; (d) co-extinction; (e) fragmentation; (f) alien species.
Watch out. Habitat loss and fragmentation are one of the four causes, not two.
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