Strategies for enhancement in food production practice · Mixed difficulty

Option A (Cellular totipotency) is correct because pollen grains developing into embryoids demonstrates the ability of a single cell to develop into a whole organism.

Option D (Stem sawfly) is correct because solid stem in wheat provides resistance against the stem sawfly.

Option B (Hybridization and mutation) is correct because improved wheat varieties for India have been developed through crossing different wheat lines (hybridization) and inducing genetic changes (mutation).

Option D (Crops - Chili, Varieties - PusaSadabahar, Disease Tobacco Mosaic virus and leaf curl) is correct because Pusa Sadabahar is a chili variety resistant to Tobacco Mosaic Virus and leaf curl.

Option A (To identify plants with desirable combination of characters) is correct because the main aim of germplasm evaluation is to find plants with the best traits for breeding.

Option B (Out crossing) is correct because outcrossing involves mating unrelated animals within the same breed, aiming to introduce new traits and improve genetic diversity.

Option C (Quantitative trait mutations) is correct because mutations in quantitative traits, such as plant height and flowering time, contributed significantly to the Green Revolution in wheat.

Option B (Inbreeding) is correct because inbreeding, the mating of closely related individuals, is used to develop pure lines in cattle by increasing homozygosity.

Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, protoplast fusion isn't the primary advantage of tissue culture.