List of top Biology Questions

Placenta is formed at around______weeks of pregnancy.
Which cell organelle in a plant cell participates in photosynthesis
In which plants oxygen is absorbed through aerial roots?
Which vitamin is necessary for clotting of blood ?
Which of the following is sound producing organ in man ?
While swallowing, which part diverts food mass away from the opening of larynx ?
What is the energy currency of the cell called ?
DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as
Match Column - I with Column - II.
 Column - I Column - II
(a) Nitrococcus(i)Denitrification
(b)Rhizobium(ii)Conversion of ammonia to nitrite
(c)Thiobacillus(iii)Conversion of nitrite to nitrate
(d)Nitrobacter(iv)Conversion of atmospheric nitrogen to ammonia
Choose the correct answer from options given below.

Which of the following algae contains mannitol as reserve food material

Which of the following statements is not correct?

What is the role of RNA polymerase III in the process of transcription in eukaryotes
Which of the following statements wrongly represents the nature of smooth muscle?
Plasmid pBR322 has PstI restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain
Identify the correct statement.

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is

Select the correct pair

Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as

Match Column - I with Column - II.

Match Column - I with Column - II.
Select the correct answer from the options given below.

Plants follow different pathways in response to the environment or life phases to form different structures. This ability is called : 

In some members of which of the following pairs of families, pollen grains retain their viability for months after release

The production of gametes by the parents, the formation of zygotes, and the F1 and F2 plants, can be understood from a diagram called :

Now a days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complementary DNA in a clone of cells, followed by its detection using autoradiography because:

Match List - I with List - II. 

List - I

List - II

(a)Cohesion(i)More attraction in liquid phase
(b)Adhesion (ii)Mutual attraction among water molecules
(c) Surface tension(iii)Water loss in liquid phase 
(d)Guttation (iv)Attraction towards polar surfaces 

Choose the correct answer from the options given below.

 

Mutations in plant cells can be induced by