Ecosystems — BIOLOGY STD 12 Science — Question

Differentiate between Repetitive DNA and Satellite DNA.

Explain Brood parasitism in birds.

In Snapdragon, A cross between true breeding red flower (RR) plants and true breeding white flower (rr) plants showed a Progeny of plants with all pink flowers.

1. The appearance of pink flowers is not known as blending. Why?
2. What is the phenomenon known as?

Name the product of fertilisation that forms the kernel of coconut. How does the kernel differ from coconut water?

State the stage at which oogonia reach their maximum number.

Name two commonly used bioreactors. State the importance of using a bioreactor.

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.

A single pea plant in your kitchen garden produces pods with viable seeds, but the individual papaya plant does not. Explain.

What is meant by abiotic synthesis? Who proposed the idea and who supported it experimentally?

Do eukaryotic cells have restriction endonucleases? Justify your answer.