Which one of the following pairs are fresh water carps?

What are three options to increase food production? Discuss each, giving the salient features, merits, and demerits.

Why do a large number of people in India suffer from 'hidden hunger'? Provide a scientific reason.

Which is the primary source for food and fodder?

Which of the following ways are suitable for increasing food production?
$I$. Agrochemical-based agriculture
$II$. Organic agriculture
$III$. Genetically engineered crop-based agriculture
Choose the correct option.

The superiority of a hybrid over its parents is known as: