Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

What are transgenic plants? Give some example.

1. Write the palindromic nucleotide sequence for the following DNA segment:

5' - GAATTC - 3'

2. Name the restriction endonuclease that recognises this sequence.
3. How are 'sticky ends' produced? Mention their role.

Give information about pills & Explain How it is useful as a contraceptive ?

Differentiate between primary and secondary succession. Provide one example of each.

What is necessary to maintain good health? Write any four benefits of good health.

Both a wine maker and a molecular biologist who had developed a recombinant vaccine claim to be biotechnologists. Who in your opinion is correct?

Explain the post-transcriptional modifications, the hnRNA undergoes in eukaryotic cells.

Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.

Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.

On world population day, Rohit and his friends arranged an awareness campaign on population explosion programme in their locality. Some elderly people tried to stop the children and asked them not to talk on such things in public. The children convinced the elders about the need for the programme and on understanding their point of view, the elders also joined the campaign.

1. Why is such awareness programme necessary?
2. What role has the government played in controlling population explosion?
3. When were reproductive health programmes initiated in India?
4. What values did Rohit and his friends show on the occasion?