Give reasons for the following:  Genetic code is ‘universal�

Subject

Biology

Class

ICSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

11.

Give reasons for the following:                

Testes descend into the scrotum before birth.

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12.

Give reasons for the following:                                                                                                

Secondary growth does not occur in monocot stems.
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13.

Give reasons for the following:                                                                      
Nitrogenous fertilisers are not applied in fields where leguminous crops grow.

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14.

Give reasons for the following:  

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. 

 
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15.

Give reasons for the following:                                                                          

At higher temperatures, green plants start evolving CO2 instead of O2.                                          

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16.

State the best known contribution of:
(i) Alec Jeffery
(ii) P.K. Sethi
(iii) Hugo de Vries

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17.

Expand the following :

(i) SCID

(ii) ZIFT

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18.

Describe the Miller and Urey experiment on the origin of life.

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19.

(b) Define the following:

(i) Frame shift mutations.
(ii) Genetic drift.

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 Multiple Choice QuestionsLong Answer Type

20.

(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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