NCERT Class VII Science Solutions: Chapter 2-Nutrition in Animals Part 3

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SHORT ANSWER QUESTIONS

Question 13:

Name the parts of the alimentary canal where

  1. Water gets absorbed from undigested food.

  2. Digested food gets absorbed.

  3. Taste of the food is perceived.

  4. Bile juice is produced.

Answer:

  1. Large Intestine

  2. Small intestine

  3. Tongue

  4. Liver

Image of alimentary canal

Image of Alimentary Canal

Image of alimentary canal

Question 14:

Mark the following statements as True or False. If false, write the correct statements.

  1. Tongue is attached to the roof of the mouth cavity at the back.

  2. The large intestine is longer and wider than the small intestine of the human alimentary canal.

  3. Mucus protects the stomach lining from damage.

  4. All heterotrophs have a similar basic process of nutrition.

Answer:

Organs in digestive system

Organs in Digestive System

Organs in digestive system

  1. False - Tongue is attached to the floor of the mouth cavity at the back.

  2. False - The large intestine is shorter and wider than the small Intestine of the human alimentary canal.

  3. True

  4. True

Question 15:

Choose the odd one out from each group and give reasons

  1. Liver, salivary gland, starch, gall bladder

  2. Stomach, liver, pancreas, salivary gland

  3. Tongue, absorption, taste, swallow

  4. Esophagus, small Intestine, large intestine, rectum

Answer:

  1. Starch: It is a type of carbohydrate. All other are parts of digestive system of human.

  2. Stomach: others are digestive glands.

  3. Absorption: others are parts of the mouth.

  4. Small Intestine: no juices are released by other parts/no digestion in other parts.

Question 16:

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime Juice and B as bitter gourd juice. How could you do it in spite of being blindfolded?

Answer:

Inspite of being blindfolded, one could identify tastes of different drinks with the help of different types of taste buds present in the tongue.

Taste buds are sensory taste receptors that help to or perception of taste.

There are four kinds of taste buds which detect sweet, salty, sour and bitter taste. These are located in different part of the tongue.

Image of stucture of tongue showing position of taste buds

Stucture of Tongue Showing Position of Taste Buds

Image of stucture of tongue showing position of taste buds

Question 17:

Fill in the blanks with suitable words:

  1. The alimentary canal stretches from ________to____________.

  2. Teeth are rooted in separate ___________in between the _____________.

  3. Digestion of food starts in ________________ and gets completed in _______________

  4. ____________ is the largest gland in the human body.

Answer:

  1. The alimentary canal stretches from mouth to anus.

  2. Teeth are rooted in separate sockets in between the gums.

  3. Digestion of food starts in buckle cavity and gets completed in small intestine.

  4. Liver is the largest gland in the human body.