Reproduction in organisms — BIOLOGY STD 12 Science — Question

Emigration, Immigration, More mortality, Unlimited resources, More natality, Continuous reproduction.

Column A	Column B
(1) Decrease in population density	————–
(2) Increase in population density	—————
(3) Exponential growth	————–

Mention a product of human welfare obtained with the help of each one of the following microbes:

1. LAB.
2. Saccharomyces cerevisiae.
3. Propionibacterium shermanii.
4. Aspergillus niger.

Which of the following are monoecious and dioecious organisms:
Chawra.

List any two molecular diagnostic techniques and write one application of each of them.

Justify the need for signing of Montreal Protocol by the participating nations.

Give the flow chart of central dogma.

A teacher wants his/ her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible.

Explain co–dominance with the help of one example.

How and why is the bacterium Thermus aquaticus employed in DNA technology? Explain.
Or
Name the source of the DNA polymerase used in PCR technique. Mention why it is used?

Or
Give the name of the organism from where the thermostable DNA polymerase is isolated. State its role in genetic engineering.

Is there a relationship between the size of an organism and its life span? Give two examples in support of your answer.