Control and Co-ordination — BIOLOGY STD 12 Science — Question

According to the 10% law given by Lindeman, only 10% of the energy is transferred to the next trophic level.

1. Name the process by which an organism produces energy.
2. What is the most common substrate used in this pathway?
3. Which biomolecule is also known as energy currency of the cell?

The traits are inherited through generations. This fact is based on the principles proposed by Gregor Mendel in 1865. However, Mendel did not discover these principles of inheritance by studying human beings, then how his principles are applied in case of humans.

Differentiate between the action of LH in males and females.

Explain how do they act as effective contraceptives in human females

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.

A group of youth were having a 'rave party' in an isolated area and was raided by police. Packets of ‘smack’ and syringes with needles were found littered around.

1. Why is taking ‘smack’ considered an abuse?
2. Write the chemical name of ‘smack’ and the name of its source plant.
3. Syringes and needles used by the youth for taking the drug could prove to be very fatal. Why?

Describe characteristics of genetic code.

1. How has the development of bioreactor helped in biotechnology?
2. Name the most commonly used bioreactor and describe its working.

How does a restriction endonuclease help in DNA recombinant technology?

1. ‘‘India has greater ecosystem diversity than Norway.’’ Do you agree with the statement? Give reasons in support of your answer.
2. Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.