Nutrition in Plants And Animals Test - 5

Stomach is a large J-shaped organ of alimentary canal, which is the widest part of the digestive tract. Large intestine, oesophagus and rectum are narrower and tube-like structures.

The hard shell of sea animals is made of a chemical compound called calcium carbonate that protects them from mechanical injury.

Steps involved in the digestive system are - Ingestion, Digestion, Absorption, Assimilation, and Egestion. Excretion is not a process of the digestive system, rather it is a process of the excretory system.

The inner lining of the stomach secretes mucus, which protects the inner membrane from the action of HCl.

In birds, jaws are modified into beak and teeth are absent.

Tongue can move in all directions.
The back of the tongue is attached to the floor of the buccal cavity.
It is a fleshy muscular organ.
It mixes saliva with food.

The finger-like projections in amoeba are called pseudopodia, which help it to engulf food.

Humans and amoebae have similar process of ingestion, i.e. they engulf the whole food. Both of them have holozoic mode of nutrition.

Maximum absorption of water takes place in the large intestine. Its function is to absorb water and some salts from the undigested food material.

The passing of watery stools from the body is known as diarrhoea, which leads to dehydration, i.e. excess loss of water from the body.