Answer: Option D. -> Amino acids 
:
D
Amino acids are the building blocks of proteins. Proteins are large molecules made up of one or more chains of amino acids. So the breakdown of proteins will ultimately resultin the formation of the same smaller units, i.e.,amino acids.

Answer: Option C. -> large intestine
:
C
Large intestine is the last part of the digestive system in vertebrates. Water is absorbed here and the remaining waste material is stored as faeces before being removed by egestion or defecation.

Answer: Option A. -> gall bladder
:
A
Bile juice,produced by the liver,is stored in a small organ called thegall bladder. Here the bile isconcentrated, before it isreleased into the small intestine where it helps in the digestion of fats/lipids.

Answer: Option D. -> mucous
:
D
Mucous is a thick fluid secreted by the inner lining of the stomach which is mixed with digestive juices. Mucous protects the inner lining of the stomach from the acids present in the gastric or digestive juices.

Answer: Option B. -> small intestine
:
B
The small intestine is a part of the gastrointestinal tractbetween the stomach and the large intestine.Mostof the digestion and absorption occurs in the small intestine. The primary function of a small intestine is absorption of nutrients and minerals from the food.

:
Functions: 1 Mark each
1 - Salivary Glands
The function of the salivary glands is to produce saliva that start digestion offood in the mouth and also to lubricate the food while swallowing.
2 - Liver
The liver is the gland that secretes bile.Bile provides an alkaline environment for many enzymes to get activatedand plays an important role in the emulsificationof fats.
3 - Duodenum
The duodenum is the first part of the small intestine. It receivesthe pancreatic juice and the bile juice and also secretes intestinal juice and is the main site for chemical digestion.
4 - Stomach
The stomach secretes digestive fluids that break down the food. It also churns the food into a milky acidic paste called chyme.
5 - Pancreas
The pancreas secretes the pancreatic juice that helps to digest carbohydrates, proteins, and fats. The pancreatic juice converts carbohydrates into simple sugars and glucose, proteins into amino acids, and the lipids into fatty acids and glycerol.

:
Full form: 1 Mark
Use: 1 Mark
The full form of ORS is Oral Rehydration Solution.
This solution is usedto prevent ortreat dehydration as a part of oral rehydration therapy(ORT).

:
Types: 1 Mark
Use: 1 Mark
Types of teeth:
(Any two)
1. Incisors
2. Canines
3. Premolars
4. Molars
Use:
Teeth help in mastication. Mastication is when food is broken into small pieces by biting, grinding and crushing with the teeth while being mixed with saliva. This is done so that digestion becomes easier.

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Differences: 1 Mark each
The dentition of ruminants or grass-eating animals is different from humans in the following ways:
1. Incisors are absent on the upper jaw of ruminants, while humans have incisors.
2. Ruminants do not have canines, while humans have canines in both the jaws.
3. Ruminant molars are much stronger than human molars as these animals chew the cud.

:
Structure: 1 Mark
Location: 1 Mark
Function: 1 Mark
Stomach is a muscular J shaped thick walled bag. It receives food from the oesophagus and opens into the small intestine. It is the widest part of the alimentary canal. It churns the food to mix the digestive juices. Mainly protein is digested in the stomach. It also secretes HCl that kills microbes and activates the enzymes.