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(b) How teeth present in infants differ from adult teeth?

Q9. When we eat food, some particles remain stuck in between or on the teeth.
These particles, if not removed, form ‘X’ and the organisms found in ‘X’ are ‘Y’.
Thousands of ‘Y’ convert the sugar into acid. This acid attacks the ‘Z’ which is
the hardest substance and covers the outer portion of the teeth and leads to
tooth decay.

(a) Identify X, Y, Z
(b) How can you prevent yourself from tooth decay?
(c) Write one importance of teeth in our body?

Q10. The five steps of nutrition are given below. Write them in correct order along
with organs where the steps take place.

Assimilation Ingestion Egestion Digestion Absorption

Correct order Organ