Q29 of 60 Page 1

Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

Homologous organs are those which have same basic structure but different functions. Forelimbs of cow, a duck and a lizard have same basic structure but different functions.

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27

Hard water is not available for an experiment. Some salts are given below:

(I) Sodium chloride


(II) Sodium sulphate


(Ill) Calcium chloride


(IV) Calcium sulphate


(V) Potassium chloride


(VI) Magnesium sulphate


Select from the following a group of these salts, each member of which may be dissolved in water to make it hard.

 28

A student identified the various parts of an embryo of a gram seed and listed them as given below:

(I) Testa


(II) Plumule


(III) Radicle


(IV) Cotyledon


(V) Tegmen


Out of these the actual parts of the embryo are:

 30

Study the given diagram and select the correct statement about the device 'X':

 31

A student has obtained a point image of a distant object using the given convex lens.

To find the focal length of the lens he should measure the distance between the: