Evolution — BIOLOGY STD 12 Science — Question

1. Why are transgenic animals so called?
2. Explain the role of transgenic animals in (i) Vaccine safety and (ii) Biological products with the help of an example each.

Since the origin of life on the earth, there were five episodes of mass extinction of species.

1. How is the 'Sixth Extinction', presently in progress, different from the previous episodes?
2. Who is mainly responsible for the 'Sixth Extinction'?
3. List any four points that can help to overcome this disaster.

List all the wastes that you generate, at home, school or during your trips to other places, could you very easily reduce? Which would be difficult or rather impossible to reduce?

What are the duties of a veterinary doctor in management of a poultry farm?

Explain Parasitism and co-evolution with the help of one example of each.

What is the natural ageing of a lake called? How is it caused? Write the impact of uncontrolled human activities on it?

How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?
Or
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognita?

Answer the following questions:
Describe the endosperm development in coconut.

Explain with an example, how molecular diagnostic techniques are helpful in early diagnosis of the diseases.

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