Reproductive Health — BIOLOGY STD 12 Science — Question

In our society a woman is often blamed for not bearing male child. Do you think it is right? Justify.

Describe the different classes of consumers.

A team of students are preparing to participate in the interschool sports meet. During a practice session, you find some vials with labels of certain cannabinoids.

1. Will you report to the authorities? Why?
2. Name a plant from which such chemicals are obtained.
3. Write the effect of these chemicals on human body.

The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?

Explain three basic steps to be followed during genetic modification of an organism.

What are called pathogens? Give information about it? (with example).

Explain adaptive radiation with the help of a suitable example.

GM Plants are useful in many ways. How would you convince the farmers to grow GM plants in their fields? Explain giving three reasons.

OR

People are quite apprehensive to use GM crops. Give three arguments in support of GM crops so as to convince the people in favour of such crops.

What is artificial selection? Explain with examples?

Eco RI is used to cut a segment of foreign DNA and that of a vector DNA to form a recombinant DNA. Show with the help of schematic diagrams.

1. The set of palindronic nucleotide sequence of base pairs the Eco RI will recognise in both the DNA segments. Mark the site at which Eco RI will act and cut both the segments.
2. Sticky ends formed on both the segments where the two DNA segments will join later to form a recombinant DNA.