Organisms and Populations — BIOLOGY STD 12 Science — Question

A couple is eager to know the sex of their unborn child. What diagnostic technique will you suggest? What social abuse is associated with the application of this technique?

Write a short note on adaptations of animal pollinated flowers.

In angiosperms, zygote is diploid while primary endosperm cell is triploid. Explain.

How and why is the bacterium Thermus aquaticus employed in DNA technology? Explain.

Or

Name the source of the DNA polymerase used in PCR technique. Mention why it is used?

Or

Give the name of the organism from where the thermostable DNA polymerase is isolated. State its role in genetic engineering.

Name a naturally occurring source which can transfer useful pathogen genes into plant cells. Similarly, name another source which is used for transfer of disease causing genes into animal cells for the benefit of humans. How are biologists using these natural resources for the benefit of mankind?

Does our blood contains proteases and nucleases?

Name the type of fruit, apple is categorised under and why? Mention two other examples, which belong to the same category as apple.

What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.

At the time of Independence, the population of India was 350 million, which exploded to over 1 billion by May 2000. List any two reasons for this rise in population and any two steps taken by the government to check this population explosion.