Reproductive Health — BIOLOGY STD 12 Science — Question

Define biodiversity.

Under what conditions would a particular stage in the process of succession revert back to an earlier stage?

What type of antibodies present in colostrums protect the newborn from certain diseases?

Name the organism commercially used for the production of single cell protein.
OR
Which of the following produces single cell proteins?
Sonalika, Spirulina, Saccharomyces.

What do you call the kind of mutation in which a single base is added to a base strand?

Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

Write the names of two main groups of cells required to achieve specific immunity.

What are barr bodies?

Name the cry genes that control cotton bollworm and cotton borer, respectively.

Why is sewage water treated until the BOD is reduced? Give a reason.