Evolution — BIOLOGY STD 12 Science — Question

Most commonly used host in transformation experiments.

Name the biological process that enables continuity of species.

Define reforestration.

Condition where plant exhibits different types of leaves on same plant.

Give one example of complete linkage.

The following statements (i), (ii) and (iii) seem to describe the waterpollinated submerged plants. Which one of these statements is incorrect?

1. The flowers do not produce nectar.
2. The pollen grains have mucilaginous covering.
3. The brightly coloured female flowers have long stalk to reach the surface.

High fever, loss of appetite, stomach pain and constipation are some of the symptoms seen in a patient. How would the doctor confirm that the patient is suffering from typhoid and not amoebiasis?

Which molecule does act as inducer molecule in lac operon?

Hugo de Vries gave the mutation theory. Name the plant he worked on.

A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be:

1. Can be ss DNA but not ss RNA.
2. Either RNA or DNA.
3. A single stranded DNA.
4. A single stranded RNA.