Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

DNA is the genetic material in most of the organisms, while RNA is the genetic material in a few viruses. What are the four general/ common functions performed by RNA in other organisms?

Name the glandular layer of human uterus.

Put these statements in the proper order, by rearranging the letters, to describe Darwin's theory of natural selection-

1. The end result of organic evolution is many different species, each adapted to specific environments.
2. Many more individuals are produced each generation that can survive and reproduce.
3. Gradually, over long periods of time, a population can become well adapted to a particular environment.
4. There are inheritable variation among the members of a population.
5. Individuals with adaptive characteristics are more likely to be selected to reproduce by the environment.

How are restriction endonuclease enzymes named?

What is a broad spectrum antibiotic? Name one such antibiotic.

With the help of a Punnett square, find the percentage of homozygous talls in a F₂ population involving a true breeding tall and a true breeding dwarf pea plant.

Write the causative agent of filariasis in humans. Mention its mode of transmission and symptoms of the disease.

OR

1. Write the scientific names of the two species of filarial worms causing filariasis.
2. How do they affect the body of infected persons?

What are the major causes of species losses in a geographical region ?

Cervix contains the largest and the strongest sphincter in its wall. Give reason.

Write about the ancestry and evolution of bat, horse and human on the basis of a comparative study of their forelimbs. What are these limbs categorized as?

OR

What is divergent evolution? Explain taking an example of plants.

OR

Divergent evolution leads to homologous structures. Explain with the help of an example.