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प्रश्न
Put a tick (✓) against the most appropriate alternative in the following statement.
The hardest substance in your body?
पर्याय
Dentine
Bone
Cement
Enamel
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उत्तर
Enamel
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संबंधित प्रश्न
Which of the following is the correct sequence of parts as they occur in the human alimentary canal?
(a) Mouth → Stomach → Small intestine → Oesophagus → Large intestine
(b) Mouth → Oesophagus → Stomach → Large intestine → Small intestine
(c) Mouth → Stomach → Oesophagus → Small intestine → Large intestine
(d) Mouth → Oesophagus → Stomach → Small intestine → Large intestine
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.
(e) What will happen if organisms A reach part F of the tooth known?
Differentiate between.
Mechanical digestion and Chemical digestion
Define with examples: Heterotrophs
Identify the option that indicates the correct enzyme that is secreted in location A, B and C.
Why do we eat?
What are the functions of gastric glands present in the wall of the stomach?
What is chyme?
Urea is a main excretory product in humans. How is it formed?
