Biodiversity, Conservation and Environmental Issues — BIOLOGY STD 12 Science — Question

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

How does colostrum provide initial protection against diseases to new born infants? Give one reason.

Name the parts of pistil which develop into fruit and seeds.

The accessibility of promoter region of prokaryotic DNA is often regulated by the interaction of a protein with a certain sequence of DNA. What name is given to such a DNA sequence?

Which bacteria converts organic acids into methane?

Pick out the ancestral line of cycads from the list given below-
Ferns, herbaceous lycopods, seed ferns and horsetails.

What is a choroid plexus? State its locations.

1. Give two examples of Indian endangered species.
2. Name the region of biosphere reserve which is legally protected and where no human activity is allowed.

Give definitions: Relative growth rate (RGR)

Which among the following is true for BT toxin?

1. It kills the lepidopterans.
2. It is coded by 'cry' gene.
3. It exists in bacteria as prototoxin.
4. All are true.