MCQ
The plant hormone which is essential for cell division is:
- AAuxin
- BCytokinin
- CEthylene
- DGibberellin
Explanation:
The cytokinins are plant growth substances that act primarily on cell division and little or no effect on extension growth.
The most important function of cytokinins is the promotion of cell division.
It is now well established that these are true cell division factors.
The varying amount of cytokinins, along with sufficient auxin is required for the growth of callus in the tissue culture experiments.
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$(i)$ Unicellular, colonial, filamentous, symbiotic or free living.
$(ii)$ The colonies are surrounded by a gelatinous sheath.
$(iii)$ Some can fix atmospheric nitrogen in specialized cells called heterocysts.
$(iv)$ They often form blooms in water bodies.
Choose the correct combination of $A$ and $B$
$\begin{array}{|l|l|} \hline Column\,\,-I & Column\,\,-II \\ \hline A.\,\,Natural\,\,auxin & 1.\,\,IAA \\ \hline B.\,\,Synthetic\,\,auxin & 2.\,\,NAA \\ \hline & 3.\,\,IBA \\ \hline & 4.\,\,2-4-D \\ \hline \end{array}$
$A - B$