Define the following: enzyme, digestion, assimilation, constipation.

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Solution

Enzyme is a biological catalyst that helps reactions to take place. It remains unchanged after the reaction.
Digestion is the breaking down of complex molecules to simple soluble forms.
Assimilation is the use of absorbed food by the body to make new cells, repair the old ones and obtain energy.
Constipation is the drying and hardening of faeces.

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Q. The correct order of steps occurring in nutrition in animals is:
(a) Ingestion → Absorption → Digestion → Assimilation → Egestion
(b) Ingestion → Digestion → Assimilation → Absorption → Egestion
(c) Ingestion → Digestion → Absorption → Assimilation → Egestion
(d) Ingestion → Assimilation → Digestion → Absorption → Egestion

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(a)Ingestion $\to$ Absorption $\to$ Digestion $\to$ Assimilation $\to$ Egestion
(b)Ingestion $\to$ Digestion $\to$ Assimilation $\to$ Absorption $\to$ Egestion

(c)Ingestion $\to$ Digestion $\to$ Absorption $\to$ Assimilation $\to$ Egestion
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Assimilation Excretion Absorption e.t.c.

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