Question Bank [2022] — BIOLOGY STD 12 Science — Question

Why is the introduction of genetically engineered lymphocytes into an ADA deficiency patient not a permanent cure? Suggest a possible permanent cure.

Name the relationship between the first two words an suggest a suitable word:
Endogamy : Self-fertilisation : : Exogamy : …………

Motor vehicles equipped with catalytic converter should use unleaded petrol.

For production of edible vaccines plants are used. Explain this any one example.

Explain how did von Helmont supported the theory of spontaneous generation?

Sometimes a gene which carries a major disadvantage in homozygous state confers an advantage in heterozygous condition. Explain by giving suitable example.

Differentiate between benign and malignant tumours.

It is often observed that the chances of a person suffering from measles in his or her lifetime are low if he or she has suffered from the disease in their early childhood. Justify the statement.

How is the first law of thermodynamics satisfied in the functioning of an ecosystem?

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.