List of top Biology Questions

Select the correct option.

Direction of RNA synthesis		Direction of reading of the template DNA strand
(1)	3' — 5'	5' — 3'
(2)	5' — 3'	5' — 3'
(3)	3' — 5'	3' — 5'
(4)	5' — 3'	3' — 5'

Anoxygenic photosynthesis is characteristic of:

Match the following and select the correct answer:

(a)	Centriole	(i)	Infoldings in mitochondria
(b)	Chlorophyll	(ii)	Thylakoids
(c)	Cristae	(iii)	Nucleic acids
(d)	Ribozymes	(iv)	Basal body cilia or flagella

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
Plant \(→\) Mice \(→\) Snake \(→\) Peacock

The osmotic expansion of a cell kept in water is chiefly regulated by:

A species facing extremely high risk of extinction in the immediate future is called:

The organization which publishes the Red List of species is:

Archaebacteria differ from eubacteria in:

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. What significance is this experiment of?

Which one of the following fungi contains hallucinogens?

Select the option which is not correct with respect to enzyme action:

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

Match the following and select the correct option:

(a)	Earthworm	(i)	Pioneer species
(b)	Succession	(ii)	Detritivore
(c)	Ecosystem service	(iii)	Natality
(d)	Population growth	(iv)	Pollination

Choose the correctly matched pair:

The zone of atmosphere in which the ozone layer is present is called:

Which of the following causes an increase in sodium reabsorption in the distal convoluted tubule?

Which is the particular type of drug that is obtained from the plant whose one flowering branch is shown below?

Select the correct matching of the type of the joint with the example in human skeletal system:

Deficiency symptoms of nitrogen and potassium are visible first in:

Identify the hormone with its correct matching of source and function: