Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Describe the mammary gland by drawing well labelled diagram of sectional view and explain the mechanism of lactation.

Explain by taking three different examples, how certain organisms pull through the adverse conditions, when unable to migrate under stressful period.

Why is pedigree analysis done in the study of human genetics? State the conclusions that can be drawn from it.

Explain with the help of an example, each of the three population interactions, where the organisms live closely together.

What are the functions of-

1. Methylated guanosine cap?
2. Poly-A 'tail' in a mature RNA?

Seeing a crowd of students in one corner of the school, the principal rushed to see the matter and found some children beating and chasing a small lizard. On seeing the principal, all the children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the injured animal. The principal rewarded Alok for his attitude to save guard our biodiversity.

1. Mention the factors resulting in loss of biodiversity
2. Was Alok an indisciplined boy, who did not run to the class on seeing the principal? What values does the act promote?

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

Give the name and character of the disease caused by Antamoeba histolytica, Trichophyton and wucheria in human.

Draw a schematic labelled sketch of a scrubber and mention its use to remove pollutants.

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