Short Answer TypeGive reasons for the following: Â Â Â Â Â Â Â Â
Testes descend into the scrotum before birth.
Give reasons for the following: Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
Secondary growth does not occur in monocot stems.Give reasons for the following: Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
Nitrogenous fertilisers are not applied in fields where leguminous crops grow.
Give reasons for the following: Â
Genetic code is ‘universal’.
The genetic code is called a universal code because all known organisms use the same four nucleotide bases; organism differ according to the arrangement of the nucleotide bases. The four nucleotide bases are adenosine, thymidine, cytidine and guanosine. Three bases form an amino acid, also known as a codon.Â
ÂGive reasons for the following: Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
At higher temperatures, green plants start evolving CO2 instead of O2.                     Â
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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