Reproductive Health — BIOLOGY STD 12 Science — Question

Name the interaction in the following:
Ascaris worms living in the intestine of humans.

Write the names of the enzymes that are used for isolation of DNA from bacterial and fungal cells respectively for recombinant DNA technique.

If the sequence of the coding strand in a transcription unit is written as follows:
5'-ATGCATGCATGCATGCATGCATGCATGC-3'
Write down the sequence of mRNA.

What types of tissue form mons pubis?

Why is a food web formed in nature?

Define the term health. Mention any two ways of maintaining it.

Name the mechanism responsible for the formation of seed without fertilization in angiosperms. Give an example of a species of flowering plants with such seed formation.

Suggest any two contraceptive methods which are very effective to avoid emergency pregnancy.

Spermatids possess haploid chromosome number. Explain.

What per cent of the earth's surface was covered by tropical rain forests at:

1. The beginning of 20th century.
2. Now, respectively?