Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Cranial nerves and Spinal nerves

Sakshi's father announced that the children are going to spend this weekend with their grandparents. During the journey, Sakshi saw some farmers who were spraying agrochemicals in their field. She requested her father to stop them. Her father praised her and contacted the farmers. He explained the side effects of such agrochemicals. He also suggested them to use biopesticides and biofertilisers instead of such chemicals. The farmers gave up spraying agrochemicals.

1. What did Sakshi's father explain to the farmers?
2. What are agrochemicals?
3. Why are biofertilisers or biopesticides preferred to chemical fertilisers or pesticides?
4. What values did Sakshi promote?

Explain sigmoid growth curve with the help of diagram.

Why do some adolescents start taking drugs. How can this be avoided?

Prashant's mother is suffering from a disorder for which doctor suggests her to take insulin injections. But his mother declines as she presumes injections are prepared by slaughtering of animals. Doctor smiled and explained him about the genetically engineered human insulin produced these days. He also convinced her to take injections.

1. Name the bacterium that is used to produce human insulin.
2. Name the company that first produced human insulin.
3. Name the disease that is treated by using human insulin.
4. What values are shown by the doctor?

Alien species invasion.

Processing of hnRNA.

Recognition sequences or restriction sites.

What is biodiversity? Explain genetic diversity with suitable example.

Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?