The deficient level of N (%) in plants suggested by various workers is________?

In low-rainfall areas, huge shifting sand dunes are commonly found, particularly near human habitations. Techniques of afforesting the shifting dunes needed to be implemented. These techniques consist of________?

Polytene chromosomes were first observed by________?

Germplasm gene banks for different crop plants in world are about________?

Maximum mutants varieties are evolved in________?

The most highly advanced division in plants kingdom is________?