Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Draw a schematic diagram of the E.coli vector PBR 322 and mark the following in it:

1. Ori
2. Rop
3. Ampicillin-resistant gene
4. Tetracycline-resistant gene
5. Restriction site BamHI
6. Restriction site EcoRI

1. A DNA segment has a total of 1,500 nucleotides, out of which 410 are Guanine containing nucleotides. How many pyrimidine bases this segment possesses?
2. Draw a diagrammatic sketch of a portion of DNA segment to support your answer.

What does the term genetic diversity refer to? What is the significance of large genetic diversity in a population?

What is microsporogenesis? Where does it occur in angiosperms? What is its significance?

To maintain the continuity of its life, Plasmodium protozoa requires both mosquito and human hosts.” Explain.

State the significance of pollination. List any four differences between wind pollinated and animal pollinated flowers.

Village women were confused as to how a thin metallic copper loop can provide protection against pregnancy. Justify the use, explaining the mode of action of IUDs.

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.

Answer the questions based on the facts given above:

1. Name the organisms depicting the patterns A and B.
2. State the reason for the growth pattern seen in
3. Write the effects of the growth patterns seen above.

List any three important characteristics of a population and explain.

Name the major enzymes involved in DNA replication.