Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Write the steps you would suggest to be undertaken to obtain a foreign-gene-product.

Explain pyramid of numbers with the help of an example.

In which food would you find lactic acid bacteria? Mention some of their useful applications.

Microbes are used for industrial production on a large scale. Explain with examples.

Answer the following questions:
Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain?

Study the given pedigree chart and answer the questions that follow:

Is the trait recessive or dominant?

Answer the following questions:
How does a farmer use the dormancy of seeds to his advantage?

Questions 1-3 are based on the following diagram. Read the questions and fill the blank spaces:

1. Each level of a pyramid represents a trophic level. With reference to the grazing food web, name an organism at the first trophic level. ______ (a) ______. Two organisms at the second trophic level ______(b)______ Two organisms at the third trophic level ______ (c) ______.
2. With reference to a pyramid of energy, why is each trophic level reduced in size?
3. Why is there a limited number of trophic levels?

Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.

Biodiversity plays a key role in many ecosystem services provided by nature.
(a) Present any two widely useful arguments to prove the validity of the statement.
(b) Write any one moral reason for protecting biodiversity.