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

Practise drawing various animals and plants.

When and why does a plant breeder employ the emasculation technique?

Write the probable differences in eating habits of Homo habilis and Homo erectus.

Explain the relationship between CFC’s and Ozone in the stratosphere.

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.).

Why ozone hole forms over Antarctica? How will enhanced ultraviolet Radiations affect us?

Discuss briefly about Ultraviolet B.

Write the names of the following:

A 15 mya primate that was ape-like

Write the names of the following:

A 2 mya primate that lived in East African grasslands

Name the pollutant attributed to be the cause of ‘ozone-hole’ over the Antarctica region.

Answer the following question.
Name the layer of the atmosphere that is associated with ‘good ozone’.

Answer the following question.
Write two differences between Homo erectus and Homo habilis.

Answer the following question.
Name the layer of the atmosphere that is associated with 'good ozone'.

Write two differences between Homo erectus and Homo habilis

Answer the following question.
Write the characteristics of Ramapithecus, Dryopithecus, and Neanderthal man.

Justify the need for the signing of the 'Montreal Protocol' by the participating nations in 1987.

The most accepted line of descent in human evolution is ______.

Which of the following is an example for link species?

Who among the Dryopithecus and Ramapithecus was more man-like?