Biology:2008:CBSE:[Delhi ]:Set-III

What causes speciation according to Hugo de Vries?

List any two economically important products for humans obtained from Apis indica.

Name the Indian variety of rice patented by an American company. 

Name the world’s most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?

What is the major difference you observe in the offspring’s produced by asexual reproduction and in the progeny produced by sexual reproduction?

What causes swelling of the lower limbs in patients suffering from filariasis?

6.  Name the types of synthesis ‘a’ and ‘b’ occurring in the replication fork of DNA as shown below:                                                                

List any two adaptive features evolved in parasites enabling them to live successfully on their hosts.

The flower of brinjal is referred to as chasmogamous while that of beans is cleistogamous. How are they different from each others?

A man with blood groups A married a woman with B group. They have a son with AB blood group and a daughter with blood group O. Work out the cross and show the possibility of such inheritance.