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

How many types of immunity are there? Write name

Explain (in one or two lines) the function of the following:
tRNA.

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

The trigger for activation of toxin of Bacillus thuringiensis is:

Write the role of histone protein in packaging of DNA in eukaryotes.

In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 per cent. Judge, which kind of ART is suited in this situation to form an embryo in the laboratory, without involving a donor?

How many sperms will be produced from 50 primary spermatocytes?

Define evolutionary biology.

In genetics engineering which is used for transfer of genes from one cell to another.

What do you understand by mangrove vegetation?