Darwin is considered the first scientist who correctly explained the theory of

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In man, the ability to roll the tongue is a variation classified as

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A tall plants crossed with a dwarf one produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents?

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Which of the following is likely to encourage inbreeding in plants?

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Which of the following statements is true of blood groups and blood transfusion?

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The probability of a baby being a boy or a girl depends on the contribution of the

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Both recessive and dominant characters are found

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The distribution of plants in a rain forest is governed mainly by

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The hygrometer is used for measuring

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A freshwater pond may contain

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The physical space occupied by an organism together with its functional role in community can be described as

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The greatest influence on a stable ecosystem in nature is exerted by

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