The biggest constraint of plant breeding is :

Options

A. availability of desirable gene in the crop and its wild relatives
B. infrastructure
C. trained manpower
D. transfer of genes from unrelated sources

Answer

d

Explanation

Both option (a) and ((d), seem to be correct. But, NCERT has mentioned that, "Conventional breeding is often constrained by the availability of limited number of disease resistant genes that are present and identified in various crop varieties or wild relatives." Thus, option (a) seems to be the better answer