Human Reproduction — BIOLOGY STD 12 Science — Question

Reptiles and frogs are oviparous animals; yet they differ in certain aspects of reproduction. Bring out the differences and mention which of the two animals has more survival advantage.

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 body are affected by the pathogen?

State the views of Oparin and Haldane on evolution. How does S.L. Miller's experiment support their views?
OR

1. Explain the theory of abiogenesis.
2. How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago?

In an E. coli cloning vector pBR 322, state the role of the following genes:

1. Ori gene.
2. Antibiotic resistance gene.
3. Rop gene.

Where does fertilization take place in human female?

Diagrammatically represent the asexual reproduction in yeast.

Why is molecular diagnosis preferred over conventional methods? Name any two techniques giving one use of each.

Your school has been selected by the Department of Education to organise and host an interschool seminar on 'Reproductive Health-Problems and Practices'. However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is 'too embarrassing'. Put forth four arguments with appropriate reasons and explanations to justify the topic to be very essential and timely.

What is artificial hybridisation? How it can be achieved?

1. Which insects are killed by Bacillus thuringiensis?
2. The Bt binds to which cells?
3. In which plants Bt toxin is used?