Jaya, Padma and Krishna are improved varieties of which of the following cereals?

The correct answer is (a) Rice.

Jaya, Padma and Krishna are improved varieties of rice. They were developed by the Indian Council of Agricultural Research (ICAR) and are widely grown in India. Jaya is a high-yielding variety of rice that is resistant to pests and diseases. Padma is a medium-duration variety of rice that is tolerant to drought. Krishna is a late-maturing variety of rice that is resistant to floods.

Wheat, barley, and maize are also cereals, but Jaya, Padma, and Krishna are not improved varieties of these crops.