Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Suggest some important steps that you would recommend to be taken to improve the reproductive health standards in India.

Describe the role of Agrobacterium tumefaciens in transforming a plant cell.

Explain the effects of alcohol on the:

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

How many primary follicles are left in each ovary in a human female at puberty?

The following is the flow chart highlighting the steps in DNA fingerprinting technique. Identify a, b, c, d, e and f.

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

Refer to the diagram given below and answer the questions that follow.

1. The parasite reproduces in human host by which method?
2. The sexual stages of parasite are referred to as?
3. Where does the fertilisation and development of parasite takes place in mosquito body?
4. What are sporozoites?
5. What is the cause of cycles of fever during malaria?

Study the graph given below and answer the questions that follows.

1. Write the status of food and space in the curves A and B.
2. In the absence of predators, which one of the two curves would appropriately depict the prey population?
3. Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.

Differentiate between the following:

Template strand and Coding strand.

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.

1. Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.
2. Write the conclusion you draw of the inheritance pattern of this disease.