Question

The correct order of steps occurring in nutrition in animals is :

(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
(d) Ingestion $\to$ Assimilation $\to$ Digestion $\to$ Absorption $\to$ Egestion

Answer 1

The correct option is (c)

Explanation of the correct answer:

Steps of Nutrition in Animals:

1. Ingestion: The first step of nutrition is ingestion or the intake of food. The ingestion of food takes place through the mouth.
2. Digestion: Ingested food is digested with the help of digestive enzymes present in the alimentary canal.
3. Absorption: After digestion occurs in the system, the smaller molecules that are produced get absorbed by the system. This process is called absorption.
4. Assimilation: Assimilation is the accumulation of nutrients in the cell. The absorbed nutrients are accumulated in the specific cells.
5. Egestion: The removal of remaining waste materials after absorption is called egestion. Feces is removed in the process of egestion.

Explanation of the incorrect answers:

Option (a):

1. Absorption of the digested food occurs after the digestion.
2. Hence, this option is incorrect.

Option (b):

1. Assimilation is the accumulation of nutrients in the cell. The absorbed nutrients are accumulated in the specific cells.

2. It occurs after absorption of nutrients from the small intestine.

3. Hence, this option is incorrect.

Option (d):

1. Assimilation occurs after digestion and absorption.

2. Hence, this option is incorrect.

Final answer:​ The correct order of steps occurring in nutrition in animals is- Ingestion $\to$ Digestion $\to$ Absorption $\to$ Assimilation $\to$ Egestion