MCQ
In $C_4$ plants, the bundle sheath cells
- AHave thin walls to facilitate gaseous exchange
- BHave large intercellular spaces
- CAre rich in $PEP$ carboxylase
- ✓Have a high density of chloroplasts
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Although all the biodiversity hot spots put together covers less than ...$C$... $\%$ of the earth's land area, the number of species they collectively harbour is extremely high and the strict protection of these hot spots could reduce the ongoing mass extinctions by almost ..$D$... $\%, A, B, C$ and $D$ in the paragraph refers to