Ecosystems — BIOLOGY STD 12 Science — Question

Name the plant source of the drug popularly called “smack”. How does it affect the body of the abuser?OR
Name an opioid drug and its source plant. How does the drug affect the human body?

What is genetic material?

How do air pollutants harm the living beings?

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.

Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species.

Give difference: RNA and DNA

A crane had DDT level as 5 ppm in its body. What would happen to the population of such birds? Explain giving reasons.

What are introns and exons? What process removes the unwanted RNA region and joins those that code for amino acids?

Who proposed the famous double stranded helical structure of DNA?

Define population and community.