Human Reproduction — BIOLOGY STD 12 Science — Question

Explain the following in context of cancer:
Benign tumour.

“It is possible that a species may occupy more than one trophic level in the same ecosystem at the same time.” Explain with the help of one example.

Why are proteins synthesized by spirulina called single cell proteins?

Why is the frequency of red-green colour blindness is many times higher in males than that in the females?

Find out the role of microbes in the following and discuss it with your teacher.
Soil

a. A patient had suffered myocardial infarction and clots were found in his blood vessels. Name a clot buster that can be used to dissolve the clots and the micro-organism from which it is obtained.
b. A woman had just undergone a kidney transplant. A bioactive molecular drug is administered to oppose kidney rejection by the body. What is the bioactive molecule? Name the microbe from which this is extracted.
c. What do doctors prescribe to lower the blood cholesterol level in patients with high blood cholesterol? Name the source organism from which this drug can be obtained.

Write the name of the bioactive molecules produced by the microbes listed below, and their role in the field of medical sciences.
a. Monascus purpureus
b. Trichoderma polysporum

Name two drugs obtained from poppy plant. "These drugs are medically useful, but are often abused". Taking the mentioned examples justify by giving reasons.

List the two steps that are essential for carrying out artificial hybridisation in crop plants and why.

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?