Ecosystem — BIOLOGY STD 12 Science — Question

Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.

"Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies." Explain.

List the attributes that populations but not individuals possess.

Describe the human female reproductive system.

A garden pea plant bearing terminal, violet flowers, when crossed with another pea plant bearing axial, violet flowers, produced axial, violet flower and axial, white flowers in the ratio of 3 : 1. Work out the cross showing the genotypes of the parent pea plants and their progeny.

List any two major causes other than anthropogenic causes of the loss of biodiversity.

1. How does a chromosomal disorder differ from a Mendelian disorder?
2. Name any two chromosomal aberration associated disorders.
3. List the characteristics of the disorders mentioned above that help in their diagnosis.

Discuss the following:
Scrubber.

Write short notes on the followings : (a) Predation (b) Competition

Give the technical terms for the following:

1. Molecular Scissors.
2. Molecular Sieve.
3. Molecular Glue.
4. Autonomous replicating circular DNA.
5. First isolated restriction endonuclease.
6. Extraction of DNA fragments from gel.