Q1 of 26 Page 284

If the fossil of an organism is found in the deeper layers of earth, then we can predict that:

A fossil refers to any preserved remains, impressions or trace of any once-living organism from a past age. Due to some environmental conditions, the bodies of dead plants and animals do not decompose completely, and such body parts become fossil and are available on digging the earth. The position of fossil in the layer of earth helps to predict the time of extinction of the organism. Deeper the fossil in the earth layers, the older it is.

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1

The Human Species have genetic roots in:

 1

The organs which perform different functions but have the same basic structure are known as:

 1

New species may be formed if:

i. DNA undergoes significant changes in germ cells


ii. There is no change in the genetic material


iii. Change in number of chromosomes


iv. Mating does not take place

 1

The presence of which of the following types of organs in two animals indicates that they are not derived from a common ancestor?