List of top Biology Questions

According to Darwin, the organic evolution is due to :

Product of sexual reproduction generally generates

What is the correct sequence of sperm formation?

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :

Down's syndrome in humans is due to

The term niche refers to

Formation of activation calyx in the egg takes place

A bivalent of meiosis I consists of:

Consider the following statements and select the correct one : Statement (A) : Pure water has maximum water potential. Statement (B) : The osmotic potential is zero in pure water.

During the transportation gases, to maintain the ionic balance chloride ions shifts from

Electrons from excited chlorophyll molecules of photosystem II are accepted first by

Match the following list of animals with their level of organization. 

Choose the correct match showing the division of labor with animal example.

The diagram given below denotes the various parts of a typical flower. Identify the labelled parts A, B, C and D and choose the correct option :

Eye of Octopus and eye of Cat show different patterns of structure. Yet they perform similar function. This is an example of

Golgi complex plays a major role in

In an inducible operon, the genes are

Which enzyme's will be produced in a cell in which there is a nonsense mutation in the lac Y gene ?

Which of the following is not a property of the genetic code?

Which is likely to be present in deep sea water ?

Which group of animals belong to the same phylum?

Read the statements (A) and (B). Choose the right one : Statement (A) : Atherosclerosis is a disease characterised by the thickening of arterial walls. Statement (B) : Deposition of cholesterol and triglycerides in the arterial walls causes atherosclerosis.

Nucleoid is

The thermal regulation centre of the body is located in ______ of brain.