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CBSE Biology 2016 Board Questions

Short Answer Type

1.

Mention two advantages for preferring CNG over diesel as an automobile fuel.


Two advantages for preferring CNG over diesel as an automobile fuel are:

(i) CNG is cheaper than diesel.
(ii) CNG burns efficiently as compared to diesel and causes less of air pollution. 


2.

What are transgenic animals? Given an example


Animals that have had their DNA manipulated to possess and express an extra (foreign) gene are known as transgenic animals.

For example - Transgenic cow like Rosie. 


3.

Write the probable differences in eating habits of Homo habilis and Homo erectus.


Homo habilis Homo erectus
Did not eat meat Ate meat
Brain comparatively smaller.  Larger brain. 

4.

Mention the role of 'genetic mother' in MOET.


The genetic mother helps in Superovulation. 


5.

A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.


Male honeybees are born from unfertilised eggs by the process known as parthenogenesis where as female honeybees are born from fertilised eggs. As unfertilised eggs carries only half number of chromosome as compared to fertilised eggs, therefore male honeybee has 16 chromosomes whereas female has 32 chromosomes.


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