Both autogamy and geitonogamy are prevented in

In which one of the following pollination is autogamous

Or
Pollination which occurs in closed flower is known as

The pollination of two flowers on different plants is known as

Or

The type of pollination in which genetically different pollen grains are brought to stigma is

The below figure shows $2$ plants of the same species. Identify the types of pollination indicated as $\mathrm{P}1, \mathrm{P}2$ and $\mathrm{P}3$