Identify X the from the figure.

$\begin{array}{|l|l|} \hline Column\,\,I & Column\,\,II \\ \hline a.\,\,Pennatula & 1.\,\,Brain\,\,coral \\ \hline b.\,\,Meandrina & 2.\,\,Sea-fan \\ \hline c.\,\,Gorgonia & 3.\,\,Sea-pen \\ \hline d.\,\,Adamsia & 4.\,\,Sea-anemonea \\ \hline \end{array}$

$a\ \ b\ \ c\ \ d$

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Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.

Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

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Two plants $A$ and $B$ are supplied with $CO_2$ with $H_2O^{18}$ and ${CO_2}^{18}$ with $H_2O$ respectively which of the following plant releases $O_{18}$ type oxygen in photosynthesis

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Cell division is initiated by

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In sclerenchyma, cell wall is:

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Most of the lichens consist of: