Q. 174.6( 28 Votes )
Apart from carbon dioxide and water, name four other raw materials which are needed by the plants.
Apart from carbon dioxide and water, nitrogen, magnesium, iron and phosphorus are needed by the plants. Plants take these raw materials from the soil.
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The inner lining of stomach is protected by one of the following from the harmful effect of hydrochloric acid. This is:Lakhmir Singh & Manjit Kaur- Biology
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When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.
(a) What are (i) organisms A, and (ii) substance B?
(b) What are (i) part C, and (ii) part D, of tooth known as?
(c) By what name are the holes E in the tooth known?
(d) Name the part F of the tooth.
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X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.
(a) What are animals like X known as?
(b) What are animals like Y known as ?
(c) Which animal, X or Y, has a longer small intestine? Why?
(d) Name one animal which is like X.
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(c) Name (i) chemicalS, and (ii) process T.
(d) Name (i) organelle U, and (ii) process V.Lakhmir Singh & Manjit Kaur- Biology