Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Write the normal body temperature of humans. How is it maintained during summers?

What does amniocentesis test? On what basis does it work? Is it justified to put a statutory ban on this process? Give reason.

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.

How does animal classification prove biological evolution?

Why Saccharomyces Cerevisiae is known as baker's & Brewer's yeast- Explain

Gene flow occurs through generations. Gene flow can occur across language barriers in humans. If we have a technique of measuring specific allele frequencies in different population of the world, can we not predict human migratory patterns in pre-history and history? Do you agree or disagree? Provide explanation to your answer.

Why should a bisexual flower be emasculated and bagged prior to artificial pollination?

How many sperms and ova will be produced by 25 primary spermatocyte and 100 primary oocyte? Explain.

"Genes contain the information that is required to express a particular trait." Explain.

Describe the cellular and cytokine barrier of innate immunity.