Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:

Fish

Label the three tiers 1, 2, 3 given in the above age pyramid.

What type of population growth is represented by the above age pyramid?

Draw an age pyramid for the ‘zero population growth rate’.

List any four characters that are employed in human population census.

Comment on the following figures: 1, 2 and 3:

A, B, C. D, G, P, Q, R, S are species

An individual and a population has certain characteristics. Name these attributes with definitions.

The following diagrams are the age pyramids of different populations. Comment on the status of these populations.

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 ______.