Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

What are the characteristic features of a true-breeding line?

List the symptoms of Ascariasis. How does a healthy person acquire this infection?

1. State the difference between meiocyte and gamete with respect to chromosome number.
2. Why is a whiptail lizard referred to as parthenogenetic.

How is a mature, functional insulin hormone different from its prohormone form?

Mention any one significance of fruit formation.

DNA is unzipped twice in a cell. Mention the two events and the enzymes responsible for it.

Which chromosome carries the mutated gene causing β–thalassemia? What are the problems caused by the mutation?

What advantage does the sea anemone get in the sea anemone-hermit crab interaction as facultative mutualism? Give an alternative term for this kind of mutualism.

1. Name the source plant of heroin drug. How is it obtained from the plant?
2. Write the effects of heroin on the human body.

Mention the usefulness of somatic hybridisation.