Human Reproduction — BIOLOGY STD 12 Science — Question

(a) Differentiate between sympathetic and parasympathetic nervous system with reference to the following:
(i) Pre and post ganglionic nerve fibres.
(ii) Effect on heart beat..
(b) Give reason- All spinal nerves are of mixed type

Shubham was taught in the biotechnology class about the production of recombinant protein with the help of bioreactor. He was surprised by this new information. In the evening he discussed it with his elder brother, who is a biotechnologist. He smiled and explained him in detail.

1. What is recombinant protein?
2. Why is bioreactors useful in industries?
3. What are the values shown by Shubham?

Describe pyramid of energy with the help of diagram.

Write any two scientific and commercial values of transgenic animals in favour of human beings.

Ornithologists observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area. Explain the cause responsible for the decline observed.

Give scientific Reson
Human heart is called as myogenic and autorhythmic?

Explain out-breeding, out-crossing and cross-breeding practices in animal husbandry.

What is the effect of UV-B radiation on body?

Why is HGP important?

What is aneuploidy? Differentiate between trisomic and triploid condition? Name any one trisomic condition found in human.