Self-incompatibility is a device for
$I$. Ensuring cross-pollination
$II$. Preventing self-pollination
$III$. Ensuring self-fertilisation
$IV$. Genetic control for self-fertilisation
Choose the correct statements from those given above
$I, II \;and \;III$
$I, II \;and \;IV$
$I, III \;and\; IV$
$I, II, III \;and\; IV$
Which type of pollen grains are required for wind pollination ?
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 :
Aquatic plant like water-hyacinth and water lily are pollinated by
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?