Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
Suggest a technique that can help the couple to have a child where the problem is with the male partner.

Write a short note on
Adaptations of plants to water scarcity:

Name the place in human ovary where the first meiotic division is completed during oogenesis. What are the products of this division? Give the chromosome number of each type of cells involved in the process.

How did Louis Pasteur successfully demolish the popular theory of spontaneous generation?

Write the physiological reason, why a woman generally cannot conceive a child after 50 years of age.

During an excursion to a botanical garden, the teacher shows an old tree, which was on the verge of extinction. As soon as the teacher advanced with the students, some enthusiastic students climbed up the tree and started cutting the branches, collecting its leaves as precious collection. Rajesh instead took photographs of the tree from various angles. The boys mocked at Rajesh while the teacher appreciated him.

1. How can biodiversity be conserved?
2. What international initiatives were taken to conserve biodiversity?
3. What values did Rajesh possess?

How is diapause different from hibernation?

1. Why does DNA replication occur in small replication forks and not in its entire length?
2. Why is DNA replication continuous and discontinuous in a replication fork?
3. Explain the importance of origin of replication' in a replication fork.

Explain innate immunity

List any three important characteristics of a population and explain.