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(A) $1$. The viability of pollen grains is highly dependent on the prevailing temperature and humidity of the environment.$2$. In some cereals like wh

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The viability of pollen grains depends on the prevailing temperature and humidity.

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(A) $1$. The viability of pollen grains is highly dependent on the prevailing temperature and humidity of the environment.$2$. In some cereals like wheat and rice,pollen grains lose viability within $30$ minutes of their release,whereas in some members of Rosaceae,Leguminosae,and Solanaceae,they maintain viability for months.$3$. Pollen grains can be stored for years in liquid nitrogen at $-196^{\circ}C$ (cryopreservation).$4$. The exine of the pollen grain is made of sporopollenin,which is one of the most resistant organic materials known,not cellulose.Therefore,option $A$ and $C$ are both factually correct statements. However,in standard textbook contexts,the dependence on environmental factors is a fundamental property. Given the options,$A$ is a correct statement.

Column-$I$	Column-$II$
$A$. Tapetum	$i$. Degenerate during development
$B$. Intine	$ii$. Resistant organic materials
$C$. Vegetative cell	$iii$. Pollen tube
$D$. Sporopollenin	$iv$. Provide nourishment to pollen grains

Select the option that represents the correct statement.

Similar Questions

$Statement\; 1$: Zygote is a single cell.
$Statement\; 2$: Two haploid cells fuse to form two diploid cells.

Make the correct pair:

Column-$I$ Column-$II$

$A$. Tapetum $i$. Degenerate during development

$B$. Intine $ii$. Resistant organic materials

$C$. Vegetative cell $iii$. Pollen tube

$D$. Sporopollenin $iv$. Provide nourishment to pollen grains

In which of the following plants are the flowers shown in the image found?

$A$: Restitutional nucleus can be observed in endothecium cells.
$R$: Endothecium cells are usually triploid.

Who worked on embryological aspects and popularized the use of embryological characters in taxonomy?

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