Question

21. Tooth decay happens when the bacteria present
in mouth turn the sugar present in our food into ----
22. The rearing of silkworms for silk is called
23. On cooling, the temperature of an object
24. Most substances on heating and _on
cooling.
25. In liquid and gases heat is transferred by the
process of
MCQS
26. The amino acids present in digestive food in our
body are used to make.
(a) fats. (b) proteins. (c) minerals (d) carbohydrates
27. Excessive use of sugar containing foods is a major
cause of
(a) indigestion (b) stomach pain (c) headache (d)
tooth decay.
28. The most common variety of silk is.
(a) Tassar silk (b) mooga silk (c) mulberry silk (d)
kosa silk.​

Answer 1

Answer:

27.... (d)tooth decay