Which of the following crop was made resistant to yellow mosaic virus…

The correct answer is Option (3) → Mung bean

Option (1) Cowpea — Incorrect. The cowpea variety Pusa Komal resists bacterial blight; it came from conventional breeding.

Option (2) Flat bean — Incorrect. Flat bean has been bred for resistance to jassids, aphids and fruit borer.

Option (3) Mung bean — Correct. Of the options, only mung bean is the crop NCERT names for mutation breeding against yellow mosaic virus and powdery mildew.

Option (4) Brassica — Incorrect. Pusa Swarnim of Brassica resists white rust.

Note 1: A similar question was also asked in CUET (UG) 2023 on 13-06-2023 (Slot 3).

Note 2: This question is from Chapter 9, Strategies for Enhancement in Food Production, of the pre-rationalised NCERT book. This chapter is not in the present NCERT book (2026-27). The extract below is from the pre-rationalised edition.

NCERT Extract (Pre-rationalised edition, Chapter 9, Strategies for Enhancement in Food Production):
Plant Breeding for Disease Resistance – “… Mutation is the process by which genetic variations are created through changes in the base sequence within genes (see Chapter 5) resulting in the creation of a new character or trait not found in the parental type. It is possible to induce mutations artificially through use of chemicals or radiations (like gamma radiations), and selecting and using the plants that have the desirable character as a source in breeding – this process is called mutation breeding. In mung bean, resistance to yellow mosaic virus and powdery mildew were induced by mutations.”