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

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.

Explain the effects of alcohol on the:

1. kidney
2. Brain
3. Heart
4. Liver
5. Immunity

For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.

Flow of energy through various trophic levels in an ecosystem is unidirectional and non-cyclic. Explain.

Name the glandular layer of human uterus.

Differentiate the following and give examples:
Active and passive immunity.

A homozygous tall pea plant with green seeds is crossed with a dwarf pea plant with yellow seeds.

1. What would be the phenotype and genotype of F, generation?
2. Work out the phenotypic ratio of F, generation with the help of a punnett square.

Write two contrivances found in selfpollinated flower.

1. What are two types of desirable approaches to conserve biodiversity? Explain with examples bringing out the difference between two types.
2. What is the association between the bumble bee and its favourite orchid Ophrys? How could extinction or change of one would affect the other?