Tag: bio-chemistry

Questions Related to bio-chemistry

Which statements are wrong here ?

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

  1. Peristaltic movements do not occur all along the oesophagus

  2. There are no platelets in blood

  3. Rings of cartilage are not present in the trachea

  4. All of above

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Correct Option: A,D

The tongue helps in mixing food with saliva.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Digestion starts from the mouth. The salivary gland in the mouth secretes saliva, with the help of tongue saliva mixes with the food when is chewed. The tongue is a muscle with glands, sensory cells, and fatty tissue that helps to moisten food with saliva.

So, the correct answer is option A.

Partially digested food in ruminants is

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

  1. Chyme

  2. Cud

  3. Bolus

  4. All of the above

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Correct Option: B
Explanation:

Ruminants are mammals that are able to acquire nutrients from plant-based food by fermenting it in a specialized stomach prior to digestion, principally through bacterial actions. The process typically requires the fermented cud to be regurgitated and chewed again. The process of re chewing the cud to further break down plant matter and stimulate digestion is called rumination. Thus, option B is correct. Chyme is the semifluid mass of partly digested food that is expelled by the stomach into the duodenum and moves through the intestines during digestion. Bolus is a small rounded mass of a substance, especially of chewed food at the moment of swallowing. 

The opening of the stomach in duodenum is regulated by  

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

  1. Sphineter of Oddi

  2. Pyloric sphincter

  3. Gastro-oesophageal

  4. Ileo-caeeal valve

Show answer
Correct Option: B
Explanation:

A. Sphincter of Oddi is the opening of the hepatopancreatic duct into duodenum.

B. Pyloric sphincter is found between the duodenum and posterior stomach. It regulates the opening of duodenum into stomach.
C. Gastro-oesophageal sphincter is found between the oesophagus and stomach.
D. Ileo-caecal valve is present between ileum of small intestine and caecum of large intestine.
So, the correct answer is 'Pyloric sphincter'.

Food is taken into the body through the 

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

  1. Tongue

  2. Mouth

  3. Teeth

  4. None of the above

Show answer
Correct Option: B
Explanation:
In the human digestive system, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of saliva.

Which animal out of the following has the longest food-pipe?

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

  1. Girraffe

  2. Camel

  3. Whale

  4. Yak

Show answer
Correct Option: A
Explanation:
The esophagus commonly known as the food pipe or gullet (gut), is an organ in vertebrates through which food passes, aided by peristaltic contractions, from the pharynx to the stomach.The giraffe has the longest neck of any land mammal, due to which the food pipe Measures about 6.5 feet in length, making it an animal with the longest food pipe as well.
So, the correct answer is 'Giraffe'.

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. Mouth

Show answer
Correct Option: D
Explanation:

Digestion starts in mouth and starch is the biomolecule whose digestion is first carried out by Ptyalin enzyme present in saliva.
No digestion occurs in oesophagus. It functions to transport semi solid bolus of food from mouth to stomach.
Intestine comes after stomach. Stomach is important for digestion of proteins.

Digestion of food in human starts from

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

  1. Duodenum

  2. Small intestine

  3. Mouth

  4. Large intestine

Show answer
Correct Option: C
Explanation:

Digestion of food starts in mouth. It is carried out in following two ways

  • Mechanical digestion which is breaking of food into smaller chunks with the help of teeth and aided by muscular tongue.
  • Chemical digestion due to ptyalin (salivary amylase) in saliva
  • So, the correct answer is 'Mouth'

Which of the following forms the inner lining of the mouth?

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

  1. Pleura

  2. Mucous membrane

  3. Pericardium

  4. Meninges

Show answer
Correct Option: B
Explanation:

The alimentary canal begins with an anterior opening the mouth, and it opens out posteriorly through the anus. The mouth leads to the buccal cavity or oral cavity. The oral cavity has 32 teeth and a muscular tongue. The buccal cavity is lined with mucous membrane, whose secretions keep mouth moist.

The structure, which prevents entry of food into wind pipe during swallowing in mammals is

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

  1. Larynx

  2. Glottis

  3. Epiglottis

  4. Pharynx

Show answer
Correct Option: C
Explanation:

The oral cavity leads into a short pharynx, which serves as a common passage for food and air. The oesophagus and the trachea (wind pipe) open into the pharynx. A cartilaginous flap, called as epiglottis, prevents the entry of food into the glottis opening of the wind pipe during swallowing.