Tag: experiments on digestive enzymes

Questions Related to experiments on digestive enzymes

Teeth that are different in shape, size and function are called as

evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Acrodont

  2. Pleurodont

  3. Homodont

  4. Heterodont

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Correct Option: D
Explanation:

Heterodont is an animal which possesses more than a single tooth morphology. For example, humans possess incisors, canines (eyeteeth), premolars and molars.

Homodont is an animals whose teeth are all of the same type. Most vertebrates except mammals are homodont. 
Pleurodont is a formation of the teeth that are fused  by their sides to the inner surface of the jaw bones.
Acrodont is a formation of the teeth whereby the teeth are consolidated with the summit of the alveolar ridge of the jaw without sockets. The term also refers to species of reptiles that have such a formation.

Grinding and chewing teeth are called as

evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Premolars

  2. Canines

  3. Incisors

  4. Molars

Show answer
Correct Option: D
Explanation:

Adult human teeth have 12 molars. They are biggest and strongest teeth. The large surface are o molars helps in grinding and chewing the food. They break up the food into pieces small enough for making it easy to swallow.

So, the correct answer is "Molars".

Layer of cells that secrete enamel of tooth is 

evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Osteoblast

  2. Ameloblast

  3. Odontoblast

  4. Dentoblast

Show answer
Correct Option: B
Explanation:

Osteoblast-bone forming cell. Ameloblast-enamel elaborating cell. Odontoblast- dentine elaborating cell. Dentoblast- tooth cell.

The teeth placed at the end of the buccal cavity and help in chewing food are which of the following?

evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Incisors

  2. Molars

  3. Canines

  4. Premolars

Show answer
Correct Option: B
Explanation:
The most posterior teeth in the mouth are the molars. They have broader and flatter surfaces with 4-5 cusps. They help in chewing and grinding the food.
So the correct answer is 'Molars'.

Saliva contains .......... enzyme which hydrolyses starch into 

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. Hydrolase, maltase

  2. Amylase, maltose

  3. Amylose, kinase

  4. None of the above

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Correct Option: B
Explanation:

The digestion of food begins at the mouth where the saliva is secreted by the salivary gland that contains an enzyme called as salivary amylase enzyme which hydrolyzes starch into maltose but the complete digestion of starch occurs only in the small intestine by the action of pancreatic amylase. 

Ptyalin is an enzyme present in

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. Gastric juice

  2. Pancreatic juice

  3. Intestinal juice

  4. Saliva

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Correct Option: D

Starch is changed to maltose by

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. Diastase/amylase

  2. Invertase

  3. Lipase

  4. Zymase

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Correct Option: A

Substrate for amylase enzyme is

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. Nucleic acid

  2. Protein

  3. Starch

  4. Fat

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Correct Option: C

If you chew on a piece of bread long enough, it will begin to taste sweet because

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. maltase is breaking down maltose

  2. lipases are forming fatty acids

  3. amylase is breaking down starches to disaccharides

  4. disaccharides are forming glucose.

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Correct Option: C
Explanation:

When you chew a piece of bread long enough, it will begin to taste sweet because amylase breaks down the starch to disaccharides.  

So the correct option is C.

Emulsification of facts is done by-

biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

  1. Saliva

  2. bile

  3. gastric juices

  4. intestinal juices

Show answer
Correct Option: A
Explanation:

Chemical digestion takes place as lingual lipase, an enzyme in your saliva, begins to emulsify fat and saliva moistens the food to make it easier to swallow. When the food reaches your stomach, the muscles there begin to churn and move to further break it down. So the correct option is 'Saliva'.