MCQ
On the basis of variation in form, structure, origin and development, sclerenchyma may be
- AFibres
- BSclereids
- ✓Either $(a)$ or $(b)$
- DBoth $(a)$ and $(b)$
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$(i)$ Grows from external surface by collecting substance on it.
$(ii)$ Grows from internal surface like living.
$(iii)$ Do not grow at all.
Which of the followings option is correct?
Assertion $(A)$:All vertebrates are chordates but all chordates are not vertebrates.
Reason $(R)$:Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below: