What is a $Pollen-embryo$?

The condition in which male and female reproductive parts are present on different plants is called:

Which of the following is called 'Terror of Bengal'?

Match the following by using the codes provided:

$A$. Vernalization	$1$. Camerarius
$B$. Double fertilization	$2$. Hofmeister
$C$. Pollination	$3$. Lysenko
$D$. Alternation of Generations	$4$. Nawaschin

Given below are two statements:
Statement $I$: Cleistogamous flowers are invariably autogamous.
Statement $II$: Cleistogamy is disadvantageous as there is no chance for cross-pollination.
In the light of the above statements,choose the correct answer from the options given below:

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