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

How many primary follicles are left in each ovary in a human female at puberty?

Shark is eurythermal, while polar bear is stenothermal. What is the advantage the former has and what is the constraint the latter has?

What are sacred groves? How are they important for conservation ?###Explain: Sacred groves.

State the measures to prevent AIDS. ### Explain prevention of AIDS.

How and why is the bacterium Thermus aquaticus employed in DNA technology? Explain.

Or

Name the source of the DNA polymerase used in PCR technique. Mention why it is used?

Or

Give the name of the organism from where the thermostable DNA polymerase is isolated. State its role in genetic engineering.

Give information about the theories of Hugo-de-Vries.

Name the following:

1. The vector of dengue fever.
2. A vaccine produced by recombinant DNA technology.
3. The type of immunity that is present at the time of birth.
4. A fish that helps in eradication of mosquito larvae.

Why is pedigree analysis done in the study of human genetics? State the conclusions that can be drawn from it.

Short note: Common cold

Mention the mode of transmission of HIV. ### What are the various routes by which transmission of human immunodeficiency virus takes place.