- 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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$A - B - C$
$(I)$. pre and postsynaptic neurons are in very close proximity
$(II)$. pre and postsynaptic neurons are separated by synaptic cleft
$(III)$. impulse transmission is very fast
$(IV)$. electrical synapses are common in our system
Select the correct option
| Column $I$ | Column $II$ |
| $(a)$ Apocarpous | $(i)$ Papaver |
| $(b)$ Syncarpous | $(ii)$ Michellia |
| $(c)$ Epiphyllous | $(iii)$ Cashew |
| $(d)$ Cotyledon | $(iv)$ Aloe |
