In some members of which of the following pai | vedclass

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(D) The period for which pollen grains remain viable is highly variable and depends on the prevailing temperature and humidity. In some cereals such a

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Rosaceae; Leguminosae

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(D) The period for which pollen grains remain viable is highly variable and depends on the prevailing temperature and humidity. In some cereals such as rice and wheat,pollen grains lose viability within $30$ minutes of their release. In contrast,in some members of the families $Solanaceae$,$Rosaceae$,and $Leguminosae$,pollen grains maintain their viability for several months. Therefore,among the given options,the pair $Rosaceae$ and $Leguminosae$ correctly represents families where pollen grains can remain viable for months.

Column-$I$	Column-$II$
$(A)$ Clone	$(1)$ Agamospermy
$(B)$ Plant apomixis	$(2)$ Scion
$(C)$ Grafting	$(3)$ Callus
$(D)$ Tissue culture	$(4)$ Flower
$(E)$ Inflorescence	$(5)$ Ramet

In some members of which of the following pairs of families,pollen grains retain their viability for months after release?

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External fertilization is mostly observed in organisms that.....

$A$: Formation of a mature male gametophyte requires one meiotic and two mitotic divisions in $60\%$ of angiosperms.
$R$: Pollination occurs in a two-celled condition in the majority of angiosperms.

In angiosperms,microsporogenesis and megasporogenesis

Give differences: Male gametophytic stage and Female gametophytic stage.

Match the following columns:

Column-$I$ Column-$II$

$(A)$ Clone $(1)$ Agamospermy

$(B)$ Plant apomixis $(2)$ Scion

$(C)$ Grafting $(3)$ Callus

$(D)$ Tissue culture $(4)$ Flower

$(E)$ Inflorescence $(5)$ Ramet

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