List of top Biology Questions

Assertion (A): Saheli is the World’s first non-steroidal oral contraceptive pill.
Reason (R): It has been developed by National Institute of Immunology, New Delhi.
Assertion (A): A bioreactor provides the optimal conditions for achieving the desired product by providing optimum growth conditions.
Reason (R): The most commonly used bioreactors are of stirring type.
RNA interference (RNAi) helps in making tobacco-plant resistant to a nematode (Meloidogyne incognita). Choose the correct option that shows how RNAi is achieved:
Amplification of gene of interest by using DNA polymerase may go up to:

Match the items in Column-A with that of Column-B:

Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.

Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in different stages of its development.

The process of mineralization by microorganisms helps in the release of:

Match the following items of Column-I with that of Column-II:

GEAC stands for
A man whose father was colour-blind marries a woman who had a colour-blind mother and normal father. What percentage of male children of this couple will be colour-blind?

The following question is based on pollination. Study the figures carefully and answer the questions that follow.

  • Give the scientific terms for the processes taking place in Figures A and B respectively.
  • Mention two conditions necessary for the process occurring in Figure B.
  •  
    • [(i)] State one advantage and one disadvantage of the process occurring in Figure B. 
      OR
    • [(ii)] Name one plant where, in some flowers only, the process in Figure B takes place and give the reason responsible for it.
Which one is not determined in the developing foetus by using amniocentesis?
Who proposed the competitive exclusion principle?
How many billion tons productivity of oceans?
How many number of biodiversity hotspots in the world right now?
Assertion (A): Apple is false fruit.
Reason (R): Thalamus also contributes to fruit formation in apple.
If a person is positive in Widal test, then that person is infected by which pathogen?
The first r-DNA was constructed in which microorganism?
Which chemical is obtained from microorganism Aspergillus niger}?
Genes which control $\alpha$-Thalassemia and $\beta$-Thalassemia are present on which number of chromosomes?
In a family tree of dinosaurs, which dinosaur was about 20 feet in height \& had huge fearsome dagger-like teeth?
Distance between two consecutive base pairs of DNA is \rule{2cm}{0.1mm}
What is the correct name of AI technique in assisted reproductive technologies?
They are useful to get rid of aphids.
Which scientist proposed that “embryo never pass through the adult stages of other animals”?