unit 4 evolution

Question 1

what is fossil.

Answer 1

Fossils are the traces and preserved remnants of living organisms.

Question 2

What is meant by evolution

Answer 2

Evolution is the orderly and gradual change of organisms from one form to another.

Question 3

What are analogous organs?

Answer 3

Those organs of animals which have same function but different anatomy is called analogous organs.

Question 4

advantage of study of fossils

Answer 4

It helps for study of past or extinct organisms and also give evidence for evolution.

Question 5

Any one cause of mutation

Answer 5

cause of mutation: It occurs because of the effects of radiation and chemicals on chromosomes.

Question 6

An example of analogous organ

Answer 6

birds and insect have different anatomy but same function

Question 7

What is organic evolution

Answer 7

Organic evolution is the gradual and orderly change of organisms from one form to another.