Reproductive Health — BIOLOGY STD 12 Science — Question

Three microbes are listed below. Name the product produced by each one of them and mention their use:

1. Aspergillus niger.
2. Trichoderma polysporum.
3. Monascus purpureus.

What is natural selection? How is artificial selection different from natural selection? Give one example each from plants and animals where artificial selection has operated.

How is corpus luteum formed and what is its important function?

Differentiate between:
Genetic diversity and species diversity.

Using a Punnett Square, workout the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

How many sperms will be produced from 50 primary spermatocytes?

On a visit to a Hill station, one of your friends suddenly became unwell and felt uneasy.

1. List two symptoms, you would look for, to term it to be due to allergy.
2. Explain the response of the body to an allergen.
3. Name two drugs that can be recommended for immediate relief.

A person has been diagnosed to be HIV⁺.

1. Name the disease and the test which the person has to undergo.
2. Write the full name of the pathogen involved and describe its structure.
3. Which particular cells of this person are likely to get destroyed?

OR

The immune system of a person is suppressed. In the ELISA test, he was found positive to a pathogen.

1. Name the disease the patient is suffering from.
2. What is the causative organism?
3. Which cells of the body are affected by the pathogen?

Explain the reason for population growth explosion.

Differentiate betweynated and insect pollinated flowers.