Human Reproduction — BIOLOGY STD 12 Science — Question

How do Darwin’s finches illustrate adaptive radiation?

1. On seeing bad state of roads in your locality, as a student, you have recommended to the Municipal corporation to use polyblend.

1. What is poly blend? Point out its raw material.
2. How will it be advantageous?

2. What are e-wastes? Explain the method of their disposal.

Name an allergen and write the response of the human body when exposed to it.

What are the major effects of deforestation ?

Is it true that if the dissolved oxygen level drops to zero the water will become septic? Given example which could lower the dissolved oxygen content of an aquatic body.

In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term?

Mention one application for the following:

1. Passive immunisation
2. Antihistamine
3. Colostrum
4. Cytokinin barrier

1. What is a vaccine? Give an example of a vaccine produced by recombinant DNA technology.
2. Name the disease against which DPT vaccine develops immunity?

Name the gases that covered the early/ primitive earth surface.

What is hybrid vehicle technology?. Explain its advantages with a suitable example?