Reproductive Health — BIOLOGY STD 12 Science — Question

List the disadvantages of insulin obtained from the pancreas of slaughtered cow and pigs.

Distinguish between
Cerebrum and Cerebellum.

A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.

1. Write what did the doctor inject into the patient's body.
2. How do you think this injection would protect the patient against the disease?
3. Name the disease against which this injection was given and the kind of immunity it provides.

What is the difference between biological oxygen demand and chemical oxygen demand? What is the effect of a higher biological oxygen demand on the level of dissolved oxygen and sensitive organisms in a water body?

In the diagram given below, show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of egg apparatus.

What is blood? What is the normal quantity of blood in an adult human being?

Give reasons : Biogas plants are more often built in rural areas.

Name the specific enzyme responsible for nucleotide polymerisation in DNA replication. Write two characteristic features of this enzyme. Name the region on E.coli DNA, where this enzyme can initiate replication.

1. Why is RNA called an 'adapter'?
2. Draw and label a secondary structure of RNA. How does the actual structure of RNA look like?

Give reason:

1. Population of different species are not capable of breeding with each other.
2. Intraspecific competition is more intense than interspecific competition.
3. Parasites tend to loose certain organs.