Choose the correct options for the following statements:
$1$. Autogamy is genetically xenogamy.
$2$. Pollination occurs by air in grass.
$3$. Placenta is arranged in the inner wall of the ovary.
$4$. It is possible to store pollen grains in liquid nitrogen at $-196^oC$.

Match the following columns:

Column-$I$	Column-$II$
$P$. Fungal diseases	$I$. Tobacco mosaic
$Q$. Bacterial diseases	$II$. Black rot of crucifers
$R$. Viral diseases	$III$. Brown rust of wheat
	$IV$. Turnip mosaic
	$V$. Red rot of sugarcane
	$VI$. Late blight of potato

Identify the haploid and diploid structures from the following list:
$I$ - Megaspore mother cell
$II$ - Microspore mother cell
$III$ - Egg cell
$IV$ - Male gamete
$V$ - Synergid
$VI$ - Embryo
$VII$ - Antipodal cell
$VIII$ - Zygote
$IX$ - Megaspore
$X$ - Microspore
Select the correct grouping for Haploid and Diploid structures.

Which one of the following statements is not true?

Pollen grains of many species cause severe allergies and bronchial afflictions in some people,often leading to chronic respiratory disorders such as .....

Long silky hairs on the cob of maize are: