Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

Name the five key tools for accomplishing the tasks of recombinant DNA technology. Also mention the functions of each tool.

Which of the following countries has the highest biodiversity?

Which one of the following is not a major characteristic feature of biodiversity hot spots?

Amongst the animal groups given below, which one appears to be more vulnerable to extinction?

What does the term ‘Frugivorous’ mean?

A species-area curve is drawn by plotting the number of species against the area. How is it that when a very large area is considered the slope is steeper than that for smaller areas?

Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?

There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.

Is it true that there is more solar energy available in the tropics? Explain briefly.

Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?

The relation between species richness and area for a wide variety of taxa turns out to be a rectangular hyperbola. Give a brief explanation.

Compressed Natural Gas (CNG) is ______.

The major source of noise pollution world wide is due to ______.

Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into ______.

Why is it necessary to remove sulphur from petroleum products?

Use of lead-free petrol or diesel is recommended to reduce the pollutants emitted by automobiles. What role does lead play?

Name the city in our country where the entire public road transport runs on CNG.

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

Given below are four contraceptive methods and their modes of action. Select the correct match:

Which of the following amino acid residues will constitute the histone core?