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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-$II$
$(A)$ Pistils fused together	$(i)$ Gametogenesis
$(B)$ Formation of gametes	$(ii)$ Pistillate
$(C)$ Hyphae of higher Ascomycetes	$(iii)$ Syncarpous
$(D)$ Unisexual female flower	$(iv)$ Dikaryotic

Select the option that represents the correct statement.

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