Question

Differentiate the following terms:

a. Excretion and Secretion 

b. Absorption and Assimilation 

c. Ingestion and Egestion 

d. Diphyodont and Heterodont 

e. Incisors and Canines

Answer 1

a.

Excretion	Secretion
The process of eliminating or expelling waste matter.	a process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion.

b.

Absorption	Assimilation
Absorption is the process by which nutrients obtained after digestion are absorbed by villi and circulated throughout the body by blood and lymph and supplied to all body cells according to their requirements.	Assimilation means the incorporation of the absorbed food materials into the tissue cells as their internal and homogenous components.

c.

Ingestion	Egestion
The process of nutrition begins with intake of food, called ingestion.	The undigested or unassimilated portion of the ingested food material is thrown out from the body through the anal aperture as faecal matter. This is known as egestion.

d.

Diphyodont	Heterodont
In human beings two sets of teeth (Diphyodont) are developed in their life time.	Permanent teeth are of four types (Heterodont).

e.

Incisors	Canines
Type of teeth used for cutting and biting foods.	Type of teeth used for tearing and piercing of food.