NCERT Solutions For Class 7 Science Chapter 2 : Nutrition in Animals

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Access NCERT Solutions for Class 7 Science  Chapter 2 – Nutrition in Animals. part-1

Access NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals.

  1. Fill in the blanks:

  1. The Main Steps of Digestion in Humans are _______, _______, _______, _______ and _______.

            Ans: ingestion, digestion, absorption, assimilation and egestion.

  1. The Largest Gland in the Human Body Is _______.

            Ans: Liver.

  1. The Stomach Releases Hydrochloric Acid and _______ Juice Which Acts on Food.

            Ans: Gastric.

  1. The Inner Wall of the Small Intestine Has Many Finger-Like Outgrowths Called_______.

             Ans: Villi. 

  1. Amoeba Digests Its Food in the _______.

            Ans: Food vacuole.


  1. Mark ‘T’ if the Statement Is True and “F” if It Is False.

    1. Digestion of Starch Starts in the Stomach.

    Ans:

           Digestion of starch starts from the mouth.

  1. The Tongue Helps in Mixing Food With Saliva.

Ans: T

  1. The Gallbladder Temporarily Stores Bile.

            Ans: T

  1. The Ruminants Bring Back Swallowed Grass Into Their Mouth and Chew It for Some Time.

            Ans: T


  1. Tick () Mark the Correct Answers in Each of the Following:

    1. Fat is Completely Digested in the 

      1. Stomach 

      2. mouth

      3. Small intestine

      4. large intestine.

       Ans: (iii) Small intestine.

Fats are completely digested in the small intestine because it gets bile from the liver through the gallbladder which is responsible for fat digestion.

  1. Water From the Undigested Food Is Absorbed Mainly in The

    1. Stomach

    2. mouth

    3. Small intestine 

    4. large intestine.

 Ans: (iv) Large intestine.

As it takes several hours for the food to travel to enter the large intestine through the digestive tract, the water from the undigested food should be cleaned, this process takes place in the large intestine.


  1. Match the Item of Column I With Those Given in Column II.

Column I

Column II

Food Components

Products of digestion

Carbohydrates

Fatty acids and glycerol

Proteins

Sugar

Fats

Amino acids

Ans:

Column I

Column II

Food Components

Products of digestion

Carbohydrates

Sugar

Proteins

Amino acids

Fats

Fatty acids and glycerol.

The food components we take contain carbohydrates, proteins and fats, which are then broken down by the digestive system into digestible ones such as sugar, amino acids and fatty acids, glycerol respectively.


  1. What are Villi? What is Their Location and Function?

 Ans:

a. The finger-like projections present in the inner wall of the small intestine are called villi.

b. Villi serves the function of increasing the surface area of the small intestine for absorption of digested food. 


  1. Where is the Bile Produced? Which Component of the Food Does It Digest?

 Ans:

a. Bile is produced by the liver. The gallbladder is where it is stored     temporarily.

b. Fat is the component of food that is digested by bile juices.


  1. Name the Carbohydrate That Can Be Digested by Ruminants but Not the Human Beings. Give the Reason Also.

Ans: Cellulose can be digested by ruminants but not by human beings. Because ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans.


  1. Name the Type of Carbohydrate That Can Be Digested by Ruminants but Not by Humans. Give the Reason Also.

Ans: Cellulose is a carbohydrate that can be digested by ruminants but not by humans as humans do not have a rumen. The cellulose of the food is digested by the action of bacteria which is present in the rumen by the rumination process.


  1. Why Do We Get Instant Energy From Glucose?

Ans: Glucose is the simplest carbohydrate that undergoes oxidation and   can be broken easily to give a high energy molecule that provides energy for cells and the bloodstream by which we get instant energy 


  1. Which Part of the Digestive Canal is Involved In:

  1. Absorption of food ------------. 

  2. Chewing of food -------------. 

  3. Killing of Bacteria ---------- 

  4. Complete digestion of food -----------. 

  5. Formation of faeces -----------. 

 Ans: 

  1. small intestine 

  2. buccal cavity 

  3. stomach 

  4. small intestine 

  5. large intestine 


  1. Write One Similarity and One Difference Between the Nutrition in Amoeba and Human Beings.

Ans: Similarity: Both humans and amoeba require food for the cellular processes. Difference: Amoeba takes food by pseudopodia and digests it in there while humans eat food which gets digested at different  parts of the digestive tract. 


  1. Match the Items of Column I With Suitable Items in Column II.

  1. Salivary gland

(i) Bile juice secretion 

  1. Stomach

(ii) Storage of undigested food

  1. Liver

(iii) Saliva secretion 

  1. Rectum

(iv) Acid release 

  1. Small intestine

(v) Digestion is complete

  1. Large intestine

(vi) Absorption of water

(vii) Release of faeces 

Ans:

  1. Salivary gland

(iii) Saliva secretion 

  1. Stomach

(iv) Acid release 

  1. Liver

(i) Bile juice secretion 

  1. Rectum

(vii)Release of faeces

  1. Small intestine

(v) Digestion is complete

  1. Large intestine

(vi) Absorption of water and (iv) Acid release 

13.  Label fig. 2.2 of the Digestive System. 

(Image will be uploaded soon)

Ans:

(Image will be uploaded soon)


  1.  Can we survive only on raw, leafy vegetables/grass? Discuss.

 Ans:

a. No, we cannot survive only on raw, leafy vegetables/grass, because to live a healthy life we should have a balanced diet with all the nutrients.

b. Raw vegetables and grasses only provide fibres which are not enough for the body. So, these green leafy vegetables will not serve the purpose.


Class 7 Science Chapter 2 Nutrition in Animals – Free PDF Download

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Chapter 2 – Nutrition in Animals

2.1 Different Ways of Taking Food

NCERT Science Class 7 Chapter 2 PDF download for Nutrition in Animals Class 7 will allow students to focus on how food is consumed. Different organisms have specific ways of consuming food. When it comes to bees and hummingbirds, they prefer sucking the nectar of plants. In terms of humans and other mammals, the infants feed on mother’s milk. Snakes find their prey and swallow them entirely. Among the aquatic animals, some of them find out little food particles freely floating in the water and feed on them.


2.2 Digestion in Humans

Human beings consume their food through the help of the mouth. The food particles are then digested and utilized for various bodily functions. The ingested food that remains undigested gets defecated. What exactly happens after the food is chewed and swallowed? 

The food enters the stomach through a continuous canal that starts at the buccal cavity and ends at the anus. This canal is divided into several parts which include:

  • The buccal cavity

  • Food pipe or Oesophagus

  • Stomach

  • Small intestine

  • Large intestine ending in the rectum

  • The anus

These parts together make the alimentary canal or the digestive tract. When the food travels through the different compartments of the canal, it gradually gets digested and reaches our system. The digestion process is done through secretion of digestive juices from the inner walls of the stomach, small intestine and other glands that are associated with the digestion process including salivary glands, pancreas and the liver. The digestive juice makes the digestion process easier by breaking the food particles into simpler forms. Now, let’s find out what happens to the food in the various parts of the digestive tract?


The Mouth and Buccal Cavity

Whatever food we eat, it is taken into the body through our mouth. This process of taking the food into the body is known to be ingestion. The teeth in our mouth help in chewing and further break down mechanically to form tiny particles. Each root of a tooth has a separate socket that goes right into the gums. Even teeth are categorized based on their functionalities and appearance. These functionalities are:

  • Cutting and biting

  • Piercing and tearing

  • Chewing and grinding


Milk Teeth and Permanent Teeth

The first set of teeth that grow during infancy are known as milk teeth. They fall off between the age of six to eight years. Each tooth comes off from the root randomly to replace it with a permanent tooth. These sets of teeth may last the entire life or fall off when an adult becomes old enough. Permanent teeth may also come off due to dental diseases.


Sweets and Tooth Decay

Usually, bacteria can be found in our mouth, but they are not always harmful. However, if we do not take care of our teeth and gums, these bacteria can start creating ill effects. They tend to find a good place and grow between the gaps and crevices of your teeth. Therefore, it is crucial to thoroughly clean and floss your mouth after every meal. The bacteria harm our teeth by releasing acids, which is used for breaking down sugar from the leftover food particles inside the mouth. This process is called tooth decay. If it’s overlooked, over time, tooth decay can cause severe toothache or loss of the tooth. Chocolates, candies, soft drinks and other sugar products are the sources of causing tooth decay. Therefore, it is pivotal to clean your teeth with a brush and also use a tongue scraper for cleaning accumulated bacteria from the pores of the tongue. Using dental floss is also a good consideration to extract trapped food particles between two teeth. Make sure not to put unwashed or dirty fingers inside your mouth.


The Food Pipe/Oesophagus

After the food is swallowed, it passes through a food pipe or oesophagus. The food pipe starts from the neck to the ends of the chest. Basically, it connects our stomach with the neck. In the food pipe, through the movement in the wall, food is pushed down to the stomach. Actually, this movement is very common in the entire alimentary canal as the system continuously tends to push the food downwards. Sometimes, based on specific situations and types of food, our stomach does not accept the ingested food particles and this causes vomiting.


The Stomach

The stomach is known to be a large compartment in the alimentary canal. It is a thick-walled bag that looks like a flattened U. This part is the broadest in the entire canal. Our stomach receives food from one end (food pipe) and releases it to the other. The other opening leads the food particles to the small intestine. There is the inner lining of the wall inside the stomach and secretes mucous, hydrochloric acid and digestive juices to extract the contents from the food, for example, protein, carbohydrate, minerals, water, and others. The internal lining of the stomach is protected by the mucous, and the acid released is responsible for killing different types of bacteria which enter along with the food. The digestive juice naturally digests the core contents of the food. It further helps to break proteins in a simpler version of substances.


Small Intestine

The small intestine is known to be the tube that is extremely coiled and measures around 7.5 meters long. The secretion from the liver and pancreas reaches into the small intestine. Also, the inner wall of the intestine secretes juice to digest the remaining part of the food. The liver secretes bile, which is stored in a large sac known as the gallbladder. The bile is an important part of digestion, especially when it comes to fats. The half-digested food then reaches to the lower part of the intestine to complete the last stage of digestion.


Absorption in the Small Intestine

All digested food passes through the wall of the intestine to enter our blood vessels. This is known as absorption. The inner wall of the intestine is filled with finger-like outgrowths called villi. They are responsible for increasing the surface area to absorb the digested food.


Large Intestine

The large instance is a bit wider and shorter when compared with the small intestine. It measures about 1.5 meters long. It is responsible for absorbing water and salts from the undigested food particles. The undigested food, in the form of waste, passes to the rectum. They are stored like semi-solid faeces. Faecal matters are then removed out of the body through the anus. The procedure is called egestion.


Diarrhoea

Sometimes when our digestive system fails, it leads to diarrhoea. This may trigger an infection, indigestion or food poisoning. This is a very common case in children, and under severe conditions, it may turn to be fatal. The excessive loss of salt and water from the body can be harmful to us.

Class 7 Science Chapter 2 solution is easily available now.


Exercise 2.4 total Solutions: 13 Questions (13 short questions).

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  • NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals has been explained illustratively.

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  • Some questions of the Class 7 Science Chapter 2 Solution comes with practical experiments that any student can perform at home for a better understanding of the topic.

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