Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.

1. Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
2. By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?

Give scientific reasons: Pollination is prerequisite for fertilization in plants.

Explain with the help of two examples, how certain plants have evolved morphological and chemical defenses against primary consumers such as cows and goats.

In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?

Differentiate between a template strand and coding strand of DNA.

1. Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
2. Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination.

What is superovulation and embryo trasnfer? How are they related?

Explain two ways of 'improper resource utilization' that can cause degradation of natural resources.

Describe the inter-relationship between productivity, gross primary productivity and net productivity.

Sketch and label – T.S. of ovary.