List of top Biology Questions

What is the site of perception of photoperiod necessary for induction of flowering in plants?

A What map unit (Centimorgan) is adopted in the construction of genetic maps?

Purines found both in DNA and RNA are:

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

Which of the following glucose transporters is insulin-dependent?

Which of the following statements is not correct?

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is:

Match the following organisms with their respective characteristics:

List I		List II
A	Pila	I	Flame Cells
B	Bombyx	II	Comb Plates
C	Pleurobrachia	III	Radula
D	Taenia	IV	Malpighian tubules

Select the correct option from the following:

Match the following genes of the Lac operon with their respective products:

LIST I		LIST II
A	i gene	i	B-galactosidase
B	z gene	ii	Permease
C	a gene	iii	Repressor
D	y gene	iv	Transacetylase

Select the correct option from the following:

Variations caused by mutation, as proposed by Hugo de Vries, are:

Drug called 'Heroin' is synthesized by: (1) methylation of morphine (2) acetylation of morphine (3) glycosylation of morphine (4) nitration of morphine

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

Which of the following pairs of gases is mainly responsible for green house effect?

Consider the following statements:
(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group. 
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme. 
Select the correct option.

Which part of the brain is responsible for thermoregulation? (1) Cerebrum (2) Hypothalamus (3) Corpus callosum (4) Medulla oblongata

Under which of the following conditions will there be no change in the reading frame of following mRNA? 5' AACAGCGGUGCUAUU 3'

Which of the following factors is responsible for the formation of concentrated urine?

Which of the following contraceptive methods do involve a role of hormone?

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:

Match the following structures with their respective location in organs.

LIST I		LIST II
A	Crypts of Lieberkühn	i	Pancreas
B	Glisson's Capsule	ii	Duodenum
C	Islets of Langerhans	iii	Small intestine
D	Brunner's Glands	iv	Liver

Select the correct option from the following:

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus:

Which of the following statements is correct?

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as: