Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Expand the following and explain any one of them:

1. IVF
2. ZIFT
3. MTP

Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?

Answer the following questions:
Still it is observed that it does not form a continuous layer around the pollen grain. Give reason.

Study the graph given below and answer the questions that follows.

1. Write the status of food and space in the curves A and B.
2. In the absence of predators, which one of the two curves would appropriately depict the prey population?
3. Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.

Construct an ideal pyramid of energy, where 1,000,000 joules of sunlight is available. Label all its trophic level.

Why should we conserve biodiversity? How can we do it?OR
Why should we conserve biodiversity? Why is it a moral as well as social duty to contribute towards its protection?

1. Sickle celled anaemia in humans is a result of point mutation. Explain.
2. Write the genotypes of both the parents who have produced a sickle celled anaemic offspring.

Differentiate between pollination and fertilization is angiosperms.

Name the embryonic stage that gets implanted in the uterine wall of a human female.

The study of:

1. Fossils of dinosaurs.
2. Forelimbs of Cheeta, bat and human.
3. Thorns of Bougainvillea and tendril of Cucurbita shows that evolution of life forms has indeed taken place on earth. Explain.