Respiration and Circulation — BIOLOGY STD 12 Science — Question

Name the type of immunity the colostrum provides to a newborn baby. Write giving an example where this type of immunity should be provided to a person.

Mention one application for the following:

1. Passive immunisation
2. Antihistamine
3. Colostrum
4. Cytokinin barrier

A cross between a red flower bearing plant and a white flower bearing plant of Antirrhinum produced all plants having pink flowers. Work out a cross to explain how this is possible.

Represent diagrammatically the global biodiversity of major taxa of invertebrates.

What are induced mutation? Give one example each of physical and chemical mutagen.

Draw a diagram of a human sperm. Label only those parts along with their functions, that assist the sperm to reach and gain entry into the female gamete.

Distinguish between
Upright and inverted pyramid.

Name any four mammals that lived in South America before continental drift.

Explain metastasis. Why is it fatal?

A set of terms are given below (box) followed by few statements in a box.

Outbreeding, Inbreeding, Out-crossing, Cross-breeding, Interspecific hybridisation.

Pick the correct term and write it against the appropriate statement.

1. Male and female animals of two different related species are mated.
2. Superior males of one breed are mated with superior females of another breed.
3. Mating of animals within the same breed, but having no common ancestors on the either side of their pedigree up to 4-6 generations.
4. Mating of more closely related individuals within the same breed for 4-6 generations.