MCQ
Keystone species are:
- AImportant for ecosystem.
- BImportant for plants.
- CEndangered species.
- DExtinct species.
Explanation:
Keystone species are plants or animals species that play a unique and crucial role in the way an ecosystem functions. They are very important for ecosystem to function properly.
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| Column $I$ | Column $II$ |
| $(a)$ Potato spindle | $(i)$ Virus |
| $(b)$ Cr-Jacob disease $(CJD)$ | $(ii)$ Viroid |
| $(c)$ Cholera | $(iii)$ Prion |
| $(d)$ Leaf rolling and curling | $(iv)$ Bacteria |