Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Bioreactors are the inclusion carriers in any biotechnology based production process. The ultimate success of any biotechnological technique depends on the efficiency of the bioreactor due to large scale production and economy.
In the context of the above passage, answer the following questions :
(i) For optimization of a bioreactor system, list possible operating instructions (rules). Make a list of any four.
(ii) "Optimal growth and metabolic activities of cells." Mention the stages of growth mentioned in.
(iii) Is the bioproduct formed in the bioreactor completely ready for immediate use as desired? Write the appropriate reasons also to support your answer.

Write briefly the changes in the following organs in the different phases of the menstrual cycle:

1. Ovaries.
2. Uterus.
3. Fallopian tube.

Describe the disease 'AIDS' under the following headings :
(i) Name of the pathogen
(ii) Name of the test to confirm the disease
(iii) Four main symptoms of the disease
(iv) Four measures of prevention
(v) Picture of viral replication.

Describe Miller and Urey’s experiment, along with the product obtained. What is the significance of this experiment?

Why are sedimentary cycles slower than gaseous cycles? Explain giving resons.

Show that Darwin’s natural selection is based on natural observation, with an example for each.

For question 1-4, use this key:

Key-

1. Ecology.
2. Population.
3. Community.
4. Ecosystem.

1. A community plus its physical environment.
2. Study of the interactions of organisms with each other and with the physical environment.
3. All populations that are found in a particular area.
4. All members of the same species that inhabit a particular area.

List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.

Write a detail notes on the conservation of biodiversity.