Human Reproduction — BIOLOGY STD 12 Science — Question

Can you think of a scientific explanation, besides analogy used by Paul Ehrlich, for the direct relationship between diversity and stability of an ecosystem?

What is central dogma. Explain the process of translation with the help of suitable diagram.

Which element is responsible for causing soil salinity? At what concentration does the soil become saline?

Which statement among the following are true and which are false :

diagram.###What is transcription? Explain the transcription process in bacteria by making a labelled diagram.###Explain the transcription process in bacteria and make a diagram.

Anukool is a big businessman in Delhi, but belongs to a small village. He went to his village during Christmas holiday. He was very disturbed to see women still using cowdung's cakes to prepare food there. He decided to set up a biogas plant so that people can use gas obtained from it for cooking. The villagers were very thankful to Anukool for his valuable help.

1. What is biogas?
2. What are the uses of biogas?
3. Name some microorganisms involved in biogas production.
4. What are the values shown by Anukool?

Define transgenic animals. Explain in detail any four areas where they can be utilised.

Describe the evidence of evolution from comparative anatomy and morphology?

State the law of independent assortment.