Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which type of lymphocytes are directly responsible for producing antibodies in response to pathogens?
The text mentions, 'The B-lymphocytes produce an army of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies.'
An antibody molecule is represented as $H_2L_2$. What do H and L stand for in this representation?
NCERT states, 'Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as $H_2L_2$.'
What is the name given to the acquired immune response that involves antibodies found in the blood?
The text explicitly states, 'Because these antibodies are found in the blood, the response is also called as humoral immune response.'
Which type of acquired immunity is responsible for graft rejection when organ transplantation occurs?
According to the NCERT text, 'The body is able to differentiate ‘self ’ and ‘nonself’ and the cell-mediated immune response is responsible for the graft rejection.'
Which of the following is an example of active immunity?
The text states, 'Injecting the microbes deliberately during immunisation or infectious organisms gaining access into body during natural infection induce active immunity.'
Passive immunity is characterized by:
NCERT clarifies, 'When ready-made antibodies are directly given to protect the body against foreign agents, it is called passive immunity.'
Which antibody type is abundantly present in colostrum, providing passive immunity to the newborn infant?
The text says, 'The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.'
The principle of vaccination is based on which property of the immune system?
NCERT states, 'The principle of immunisation or vaccination is based on the property of ‘memory’ of the immune system.'
What is introduced into the body during vaccination?
The text explains, 'In vaccination, a preparation of antigenic proteins of pathogen or inactivated/weakened pathogen (vaccine) are introduced into the body.'
Which cells are generated by vaccines to quickly recognize and overwhelm subsequent exposure to a pathogen?
According to NCERT, 'The vaccines also generate memory – B and T-cells that recognise the pathogen quickly on subsequent exposure and overwhelm the pathogenic agents.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.