Evolution — 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

Arrange the following parts of mammary gland in correct order in which milk secreted from the cells of alveoli of lobes reaches the nipple. Lactiferous duct, mammary duct, mammary tubules, mammary ampulla.

1.How and at what stage does Plasmodium enter into a human body?

2.With the help of a flow-chart only show the stages of asexual reproduction in the life-cycle of the parasite in the infected an.

3.Why does the victim show symptoms of high fever?

1. Write your observations on the variations seen in the Darwin’s finches shown above.
2. How did Darwin explain the existence of different varieties of finches on Galapagos Islands?

Where are the main centres of biodiversity in Western Ghats? Mention two significance of conservation of biodiversity.

Study the figure (a) and (b) given below and answer the questions given after the graphs.

1. Under the influence of which type of Natural Selection would graph (a) become like graph.
2. What could be the likely reasons of new variations arising in the population?
3. Who suggested Natural Selection as a mechanism of evolution?

What is detritus food chain?

By which technique are the gene defects identified in a child or fetus treated? Explain with example.

Give an example of micro organisms that have transforming ability.

In relation to energy transfer in ecosystem, explain the statement "10kg of deer's meat is equivalent to 1kg of lion's flesh".