MCQ
Which phylum do not show radial symmetry?
- ACoelenterates
- BEchinoderms
- ✓Annelids
- DCtenophores
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$(i)$ It is a contractile tissue present only in the heart.
$(ii)$ Cell junctions fuse the plasma membranes of these cells and make them stick together.
$(iii)$ Communication juntions at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
Which of the following type of tissue is being described by the above statements?
$(a)$. Possess tissue level organistion
$(b)$. Has heterocyst
$(c)$. Can fix atmospheric Hydrogen
$(d)$. They are eubacteria