Q28 of 60 Page 1

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:

Plumule, radical, cotyledon are the actual parts of the embryo of gram seed. Testa and tegmen are the parts of seed coat.

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26

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue


(II) Sodium hydroxide readily dissolves in water


(III) The beaker containing solution appears cold when touched from outside


(IV) The blue litmus paper turns red when dipped into the solution


The correct observations are:

 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.

 29

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

 30

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