Give reasons for the following:
Nitrogenous fertilisers are not applied in fields where leguminous crops grow.
Give reasons for the following:
At higher temperatures, green plants start evolving CO2 instead of O2.
State the best known contribution of:
(i) Alec Jeffery
(ii) P.K. Sethi
(iii) Hugo de Vries
(i) Alec Jeffery: DNA fingerprinting
(ii) P.K. Sethi : Prosthesis/Jaipur Foot
(iii) Hugo de Vries: Mutation/Saltation
(a) Name and define the three types of natural selection.
(b) State the following:
(i) Hardy Weinberg’s principle
(ii) Theory of recapitulation