Show that Darwin's natural selection is based on theoretical factual observations, with an example for each.

What are natural and synthetic polymers? Give one example of each

Classify crystalline solids on the basis of nature of intermolecular forces existing between the molecules, Give suitable examples for each category.

Discuss theory of natural selection proposed by darwin.

What are natural and synthetic polymers? Give two examples of each type.

State basic postulates of Darwin.s theory of natural selection and compare it with Lamarck.s theory of evolution.

Answer any three of the following (restrict each answer to two or three important sentences) Explain mechanism of natural selection by taking example of industrial melanism.

Read the given statements and select the correct option. (i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass. (ii) IA A is universal natural auxin, discovered by Kogl et al. (iii) IBA is both natural and synthetic auxin. (iv) Auxins promote the growth of lateral shoots.

Nature plays a decisive role in selecting the fit organisms'. Explain the above statement with the help of two examples.

Given : 1 = Natural selection , 2 = Variations and their inheritance , 3 = Survival of the fittest , 4 = struggle for existence According the Darwinism, which of the following represents the correct squence of events in the origin of new species ? (a) 3,4,1,2 (b) 2,3,1,4 (c) 1,2,3,4 (d) 4,2,3,1