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Evolution

Question

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Using internet and discussing with your teacher, trace the evolutionary stages of any one animal say horse.

Solution

The major evolutionary trend of horses:
(i) General increase (with occasional decrease) in size.
(ii) Progressive loss of toes.
(iii) Lengthening of toes that are retained.
(iv) Lengthening of limbs in general.
(v) Enlargement of brain (especially cerebral hemisphere).
(vi) Increase in the height.
(vii) Increase in the complexity of molar teeth and an enlargement of the last two and, eventually, the last three premolars until they came to resemble molars.

Fig. Evolution of horse.
Evolution of horse. Top row shows change in form and size of the body.
Second row show reduction in lateral toes of hind and forelimbs.
The right figure in each set of two is of the forefoot, the left of the hindfoot.
Third row shows change in form and size of skull.

Some More Questions From Evolution Chapter

Give another name for origin of life from non living matter.

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

What is the phenomenon called when the original drifted population becomes founders?

What are the two key concepts of Darwinian Theory of Evolution

What were the units of life according to the early Greek thinkers ?

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

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