List of top Biology Questions

Stomatal transpiration takes place during day time in the following plants except
In karyokinesis of meiosis - I, which of the following separates?
Which of the following converting a testis originates from peritoneum?
Which is not a prime element?
Which of the following acts as hemoglobin (Hb) in the blood buffer system?
Which of the following is a commercial blood cholesterol lowering agent?
Identify linear polymer from following
What is an example of chiropterophily?
During which phase of karyokinesis does the disappearance of the nucleolus and nuclear envelope occur?
Which is an intensive property?

Which part of root absorb mineral?

How many dehydrogenation reactions in Krebs cycle?
How many time needed for PCR?

What is the primary function of Bowman’s capsule in nephron?

Disorder caused due to accumulation of amyloid proteins in CNS.
Immunity in our body is of two types: (i) Innate immunity and (ii) acquired immunity. Innate immunity is a non-specific defence mechanism, whereas acquired immunity is pathogen-specific; it is called specific immunity too. Acquired immunity is characterised by memory. Antibodies are specific to antigens and there are different types of antibodies produced in our body: they are IgA, IgE, IgG, IgC, and IgM. It shows primary response when it encounters the pathogen for the first time and secondary response during the subsequent encounters with the same antigen/pathogen.

(d) How is active immunity different from passive immunity?

Immunity in our body is of two types: (i) Innate immunity and (ii) acquired immunity. Innate immunity is a non-specific defence mechanism, whereas acquired immunity is pathogen-specific; it is called specific immunity too. Acquired immunity is characterised by memory. Antibodies are specific to antigens and there are different types of antibodies produced in our body: they are IgA, IgE, IgG, IgC, and IgM. It shows primary response when it encounters the pathogen for the first time and secondary response during the subsequent encounters with the same antigen/pathogen.

(c) The organ transplants are often rejected if not taken from suitable compatible persons. [(i)] Mention the characteristic of our immune system that is responsible for the graft rejection. [(ii)] Name the type of immune response and the cell involved in it.

The symptoms of malaria do not appear immediately after the entry of sporozoites into the human body when bitten by female Anopheles mosquito. Explain why it happens.
Mention any four strategies adopted by flowering plants to prevent self-pollination.
Assertion (A): Restriction endonuclease recognises palindromic sequence in DNA and cuts them. Reason (R): Palindromic sequence has two unique recognition sites PstI and PvuI recognised by restriction endonuclease.
Select the correct statement from the following biotechnological procedures:
Assertion (A): The number of white winged moths decreased after industrialisation in England. Reason (R): Effects of industrialisation were more marked in rural areas of England.
For commercial and industrial production of citric acid, which one of the following microbes is used?
The decrease in the T-Lymphocytes count in human blood will finally result in
Match List I with List II:

List I

List II

AP waveIHeart muscles are electrically silent.
BQRS complexIIDepolarisation of ventricles.
CT waveIIIDepolarisation of atria.
DT-P gapIVRepolarisation of ventricles.
Choose the correct answer from the options given below: