Strategies for Enhancement in Food Reproduction — BIOLOGY STD 12 Science — Question

With the help of a suitable example, explain the concept of 'commensalism'.

Can we call human evolution as adaptive radiation?

1. Highlight the role of thymus as a lymphoid organ.
2. Name the cells that are released from the above mentioned gland. Mention how they help in immunity.

Why does corpus luteum secrete large amount of progesterone during luteal/ secretory phase of the menstrual cycle?

What would happen when you grow a recombinant in a bioreactor but forget to add antibiotic to the medium in which the recombinant is growing?

State the role of T lymphocytes and B lymphocytes in developing acquired immunity against certain diseases.
OR
Name the different types of cells that are responsible for producing the acquired immune response in a human body. How do these cells respond when a pathogen enters the body?

OR
Name the two special types of lymphocytes in humans. How do they differ in their roles in immune response?

Write the objections to Mutation theory of Hugo de Vries.

Name the scientists who were credited for showing the role of Penicillin as an antibiotic?

Give reasons : High BOD indicates intense level of microbial pollution.

How do bioactive molecules of fungal origin help in restoring good health of humans?