Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

How are ‘sticky ends’ formed on a DNA strand? Why are they so called?

Why does Plasmodium require a host?

Explain giving three reasons why tropics show, greatest level of species diversity.

Give a scientific term for the following sentences:

1. Total number of individuals of a species in an area.
2. A surgical procedure performed on males in which the vas deferens are cut and tied is known as:
3. A contraceptive device consisting of a small thimble-shaped cup that is placed over the uterus to prevent the entrance of spermatozoa.
4. Removal of gonads, often referring to the removal of male testes is called.

Differentiate between monoecious and dioecious plants. Give one example of each.

Explain Biopiracy with any suitable example.

Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

Retroviruses do not follow central Dogma. Comment.

Aman with blood group AB and his wife with blood group o claim a child with blood group O as their son. Justify with the help of Punnett square whether it is possible or not.