Question
Name and explain the two types of immune responses in humans.

Answer

There are two immune response.
i. The primary immune response occurs when an antigen comes in contact with the immune system for the first time. During this time the immune system has to learn to recognize the antigen and how to make an antibody against it and eventually produce memory lymphocytes.
ii. The secondary immune response occurs when the second time (3rd, 4th, etc.) the person is exposed to the same antigen. At this point, immunological memory has been established and the immune system can start making antibodies immediately.
Image

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A farmer harvests his crop and expresses his harvest in three different ways.
  1. I have harvested 10 quintals of wheat.
  2. I have harvested 10 quintals of wheat today in one acre of land.
  3. I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing.
Do the above statements mean one and the same thing. If your answer is yes, give reasons. And if your answer is ‘no’ explain the meaning of each expression.
Where is an 'operator' located in a prokaryote DNA? How does an operator regulate gene expression at transcriptional level in a prokaryote? Explain.
Discuss briefly about seed viability.
Answer the following questions:
Explain sex determination in humans.
Name the hormone that maintains the functions of male accessory ducts and glands.
When someone buys packets of cigarettes, cannot miss the statutory warning that is present on the packing which warns against smoking and says how it is injurious to health. Yet, smoking is very prevalent in our society, both among young and old. Advise the adolescents about the importance of avoiding smoking. (Mention any six points.)
Discuss briefly the following:
  1. Radioactive wastes.
  2. Defunct ships and e-wastes.
  3. Municipal solid wastes.
Enlist the probable causes of infertility.
By the end of 2002 the public transport of Delhi switched over to a new fuel. Name the fuel. Why is this fuel considered better? Explain.
How does Agrobacterium tumefaciens act as a suitable vector in biotechnology experiments? Cite an example, where it has been successfully used as a vector.