What is geitonogamy?

Both, autogamy and geitonogamy are prevented in

From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

Assertion : Although geitonogamy is functionally crosspollination involving a pollinating agent, genetically it is similar to autogamy. Reason : In geitonogamy, pollen grains from the anthers of one flower are transferred to the sigma of another flower borne on the same plant.

What is variation? What are its types?

What is myopia? What is its remedy?