What is the Role of the Acid in Our Stomach? - Science


What is the role of the acid in our stomach?



Following are the roles of acid in our stomach:→ The hydrochloric acid present in our stomach dissolves bits of food and creates an acidic medium. In this acidic medium, enzyme pepsinogen is converted to pepsin, which is a protein-digesting enzyme.
→ It also kills many bacteria and other microorganisms that enter alongwith the food.

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Chapter 6: Life Processes - Intext Questions [Page 101]


NCERT Science Class 10
Chapter 6 Life Processes
Intext Questions | Q 3 | Page 101

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Fill in the blank and rewrite the completed statement: 
.................... is the largest gland in the body.

Draw neat labelled diagram of the pancreas with their associated structures

Pancreas, Gall bladder, Glomerulus, Liver

Write names of different parts of human digestive system and explain functions of any three parts.

Fill in the blanks:

The inner wall of the small intestine has many finger-like outgrowths called __________.

Mark ‘T’ if the statement is true and ‘F’ if it is false:

Digestion of starch starts in the stomach. (T/F)

Why do we get instant energy from glucose?

Which part of the digestive canal is involved in chewing of food ____

Which part of the digestive canal is involved in: killing of bacteria ____.

Which part of the digestive canal is involved in: formation of faeces ____.

Name any four life processes in living things.

Carbohydrates are bodybuilding nutrients.

In which part of the digestive system is water absorbed?

Define holozoic nutrition. Give one example

What are the functions of liver and pancreas in the human digestive system ?

What is meant by dental caries? How are they caused?

The length of small intestine in a human adult is about:
(a) 4.5 m
(b) 1.5 m
(c) 3.5 m
(d) 6.5 m

Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.

Define the terms 'nutrients'.

List in tabular form two differences between pepsin and trypsin. 

The stomach secretes gastric juice, which contains hydrochloric acid. What is its function?

Give any four reasons why water is necessary in our body.

Draw a labelled diagram to show the internal structure of a mammalian tooth with two roots.

Complete the following table by filling in the blanks 1 to 8.



Food acted upon

Find product





Mouth 4 5 Disaccharide





________ is the largest gland in the body.

Draw a well-labelled diagram of the ‘Liver’.

Give Scientific reasons:  
Consuming iodized salt in day to day diet is essential. 

List two different functions performed by the pancreas in our body.

Write one function each of the following enzymes:


State whether the following statement is True or False.

Saliva changes starch into maltose.

Fill in the blanks in the table (1-5) by selecting the suitable names of substances from the list given below:
(steapsin, peptones, fatty acids, proteoses, protein).

Digestive Enzymes Acts on To convert into
(i) Pepsin _________(2) ________(3) and
(ii) _______(1) Fats



What is the role of the liver and the pancreas respectively in the digestion of food?

Define the term ‘digestion’.

State the four ways in which saliva is useful to us.

Fill in the blank.

Steapsin is also called _________

Fill in the blank.

Saliva contains salivary amylase which changes starch to _____.

Fill in the blank.

Peristalsis is caused by _____________________________.

Fill in the blanks.

______ and ______ help in digestion but food does not pass through them.

Write short answers

Define homodont dentition.

Name the types of teeth in human with functions.

Observe the diagram given alongside and answer the following:

  1. Name the parts numbered 1-8.
  2. Which parts shown in the diagram are non-living?
  3. Is the tooth suited for cutting, tearing or grinding?
  4. What is the function of parts 8 and 7?
  5. What is the total number of teeth present in adult human beings?
  6. Write the dental formula of human beings.

Describe the human alimentary canal.

Correct the spellings: Disegion

Correct the spellings: Bilirubin

The question has four options. Choose the correct answer:

Uvula can close the opening of

Fill in the blanks with the right word from those given below.

The process of digestion starts from the ............. . 

Fill in the blanks with the right word from those given below.

Pushing forward the food that has been chewed is the function of the ............. .

Who is telling a lie?

Tongue: My taste-buds can tell only a sweet taste.

Who is telling a lie?

Liver: I am the largest gland in the body.

Who is telling a lie?

Large intestine: I am 7.5 meter long.

Who is telling a lie?

Appendix: Digestion is impossible without me.

Who is telling a lie?

Lung: I play an important role in excretion.

Give reasons.

Food becomes acidic in the stomach.

Sketch and label a diagram of the digestive system and describe it in your own words.

What bodily needs or sensations do you become aware of even though you are reading a book?

Name the organs of the digestive system

How do we know that we are hungry and that we should now eat?

How do the salivary glands come to know that there is food in the mouth and it is time to secrete saliva?

What makes respiration and blood circulation go on all the time, and the processes of digestion happen at the right time?

Which systems work together to provide the body with energy?

What’s the solution?

A person has fainted and a crowd of people has surrounded him.

Why do we sometimes choke suddenly while eating?

Answer the following question.

Small Intestine is very long and coiled. Even if we jump and run, why it does not get twisted? What can happen if it gets twisted?

Write down the explanation.

Explain the structure of tooth.

Write down the explanation.

Explain why human dentition is considered as thecodont, diphydont and heterodont.

Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.

A group of organs together make up an ______ system.

List out the functions of the digestive system.

Circle the odd one.

Circle the odd one.

Circle the odd one.

Breakdown of food into smaller molecules in our body is known as

The other name of food pipe is alimentary canal.


Enzymes: Digestive glands:: _______: Endocrine glands.

Write any two functions of digestive system.

Bile helps in the digestion of ______.

State whether true or false. If false, correct the statement.

During digestion, proteins are broken down into amino acids.

Describe the alimentary canal of man

A calcified connective tissue from which the basic shape of the tooth is derived is known as ______.

______ is the common passage of air and food.

Which option represents the CORRECT sequence of digestive organs between the mouth and the anus?

Identify the correct human dental formula.

(i)______ and (ii)______ form the common bile duct.

Which sphincter guards the opening of the hepato-pancreatic duct?

Identify the salivary gland lying below the tongue.

In the given histology of the alimentary canal, identify i, ii, and iii.

Select the correct pair of peptide hormones secreted by the alimentary canal.

Name the organism which lives in the digestive system of human ______.

Liver transports nutrients, oxygen, wastes, and hormones.

Choose the odd one:

Choose the odd one:

Match the following:

1. Pancreatic juice a. Breaking starch
2. Salivary enzymes b. Digestive enzymes
3. Salivary gland c. Alimentary canal
4. Digestive tract d. Parotid

What is digestion?

______ is a major organ for the digestion of food materials.

The digestive glands associated with the alimentary canal are ______.

List the parts of the digestive system.

List the glands associated with digestion.

How do carbohydrates, proteins and fats get digested in human beings?

Choose the correct order of terms that describes the process of nutrition in ruminants.

Digestion of food starts in ______ and gets completed in ______.

The following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describe each process.

Breaking of complex food substances into simpler and soluble substances.

Solve the crossword given in Figure 2.3.

Across Down
1 Cream-coloured digestive gland 2 Feeds with the help of pseudopodia
3 Undigested excretory solid residues 6 Total number of molars in one jaw of an adult
4 Organ that mixes saliva with the food 8 Largest gland
5 Point of defecation 9 Watery secretion in the mouth
7 Stored in gall bladder 11 A ruminant
10 Finger-like outgrowth in the small intestine 12 Form of food chewed by ruminants
13 Kind of taste buds    
14 Kills bacteria in the stomach    

Curdling of milk protein is done by ______.

______ is the vestigeal organ in human.

What is chyme?

What is a vermiform appendix?

What are the end products of digestion of starch, proteins, and fats respectively?

Rearrange the jumbled sequence of the different parts of the alimentary canal in proper sequence, (esophagus, small intestine, stomach, large intestine, anus, mouth, rectum)

The complete digestion and absorption of nutrients is done by the small intestine. Which of the following greatly enhances the process of absorbtion?


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