Tag: digestion

Questions Related to digestion

Common passage for swallowing food and breathing is

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. Gullet

  2. Pharynx

  3. Glottis

  4. Larynx

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Correct Option: B

Length of human alimentary canal is

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. 100 cm

  2. 3-4 m

  3. 4-6 m

  4. 6-9 m

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Correct Option: D
Explanation:

The alimentary canal is a long tube through which food is taken into the body and digested. In human beings, this passage is about 30 ft (9 m) long." The alimentary canal, or the digestive tract as it is most commonly known, is 9 meters from the oesophagus to the anus.


So, the correct option is '6-9 m'.

In man even though both air and food go through the pharynx, food does not normally enter the wind pipe because during swallowing of food

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. The epiglottis covers the glottis

  2. Sphincter of Oddi closes the hepato-pancreatic duct

  3. Pyloric sphincter covers the opening of stomach into the duodenum

  4. None of these

Show answer
Correct Option: A

A complete digestive tract consists of an oral and an anal opening.

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. True

  2. False

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Correct Option: A
Explanation:

In humans, the alimentary canal begins with an anterior opening, called mouth and it opens out posteriorly through another opening, anus. Such an alimentary canal is called complete. In some animals like coelenterates only single opening is present, such an alimentary canal is called incomplete. 

In humans, protein digestion is completed in the mouth.

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. The pancreas produces a juice containing several enzymes that break down carbohydrates, fats, and proteins in food. Hence, partial digestion occurs in the mouth.

Soidum potassium pumps in the axonal membrane ionic gradients across the resting membrane by 

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. Passive transport of $Na^+$ outwards and $K^+$ inwards

  2. Active transport of $Na^+$ inwards amd $K^+$ outwards

  3. Transport of $Na^+$ and $K^+$ ions along their concentration gradients.

  4. Active transport of $Na^+$ outwards and $K^+$ inwards

Show answer
Correct Option: D
Explanation:

Sodium-potassium pumps in the axonal membrane ionic gradients across the membrane by active transport of Na${+}$ outwards and K${+}$ inwards.

So, the correct option is 'Active transport of Na+ outwards and K+ inwards'.

Match the items in Column I with Column II.

Column I Column II
A. Mouth a. Protein
B. Stomach b. Water
C. Small Intestine c. Starch
D. Large Intestine d. Fat

Select the alternative which shows the correct matching.

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. A - d, B - c, C - a, D - b

  2. A - c, B - d, C - b, D - a

  3. A - c, B - a, C - d, D - b

  4. A - b, B - a, C - d, D - c

Show answer
Correct Option: C
Explanation:

Amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion in mouth. Protein digestion begins in the stomach with the action of an enzyme called pepsin. Lipids are digested mainly in the small intestine by bile salts through the process of emulsification, which allows lipases to divide lipids into fatty acids and glycerol. The large intestine is the final section of the gastrointestinal tract that performs the vital task of absorbing water and vitamins while converting digested food into faeces. 

Digestion of starch starts from

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. Stomach

  2. Intestine

  3. Oesophagus

  4. Buccal cavity

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Correct Option: D
Explanation:

Carbohydrate digestion begins in the mouth or buccal cavity. The salivary glands in the mouth secrete saliva, which helps to moisten the food. The food is then chewed while the salivary glands also release the enzyme salivary amylase, which begins the process of breaking down the carbohydrate food.

Chewing is an example of

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. Chemical digestion

  2. Mechanical digestion

  3. Involuntary action

  4. Hydrolysis

Show answer
Correct Option: B
Explanation:

There are two kinds of digestion: mechanical and chemical. In mechanical digestion, food particles are physically broken down into smaller pieces. It begins in the mouth where the food is chewed. 

Therefore, the correct answer is option B.

The accessory organs in the digestive system are

bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

  1. Tongue, Pancreas, Liver, Gallbladder and Salivary glands

  2. Tongue, Pancreas, Small intestine, Gallbladder and Salivary glands

  3. Tongue, Small intestine , Large intestine, Gallbladder and Salivary glands

  4. None of the above

Show answer
Correct Option: A
Explanation:

An organ that helps with digestion but is not part of the digestive tract. The accessory digestive organs are the tongue, salivary glands, pancreas, liver, and gallbladder. Chemical digestion in the small intestine relies on the activities of three accessory digestive organs the liver, pancreas, and gallbladder. The digestive role of the liver is to produce bile and export it to the duodenum. The gallbladder primarily stores, concentrates, and releases bile. The pancreas produces pancreatic juice, which contains digestive enzymes and bicarbonate ions, and delivers it to the duodenum.