Observe the diagram and answer the question.

Identify the correct statement from the following:

Pollen banks contain stored pollen in liquid nitrogen at -196°C

The correct answer is Option (3) → Pollen banks contain stored pollen in liquid nitrogen at -196°C

When once they are shed, pollen grains have to land on the stigma before they lose viability if they have to bring about fertilisation.  The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity. In some cereals such as rice and wheat, pollen grains lose viability within 30 minutes of their release, and in some members of Rosaceae, Leguminoseae and Solanaceae, they maintain viability for months. It is possible to store pollen grains of a large number of species for years in liquid nitrogen (-196^oC). Such stored pollen can be used as pollen banks, similar to seed banks, in crop breeding programmes.