Q. Which of these processes involve tissue culture?
I. Somatic hybridization to produce a hybrid between potato and tomato called pomato.
II. Mutation breeding to produce a mung bean resistant to yellow mosaic disease.
III. Cross hybridization to produce insect-resistant rapeseed mustard called Pusa Gaurav.
IV. Micropropagation to produce a virus-free potato plant.

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Solution:

Somatic hybridization is the process in which isolated protoplasts from two different varieties of plants are fused. Cross hybridization is combining desirable characteristics from two plants by the method of cross pollination. Mutation breeding is breeding of plants in which genetic variations are created by gene mutation. It involves cross hybridization. Micropropagation is the process of growing thousands of plants in nutrient medium using their shoot tips which are free from viruses.