Short Answer TypeGive reasons for the following:
Nitrogenous fertilisers are not applied in fields where leguminous crops grow.
Nitrogenous fertilisers are not applied in fields where leguminous crops grow as the roots of leguminous crops contain nitrogen-fixing bacteria such as Rhizobium or Azotobacter, which fix the free nitrogen of the atmosphere into nitrates. Thus nitrogen is already made available to the plants and there is no need to add nitrogenous fertilisers.
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
Long Answer Type(a) Name and define the three types of natural selection.
(b) State the following:
(i) Hardy Weinberg’s principle
(ii) Theory of recapitulation
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