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Practice Class 7 Science Chapter 2 Nutrition in Animals MCQ Questions with Answers and Useful Details based on the NCERT syllabus. Learn about the tongue, saliva, teeth, digestion of food, digestive glands, and the role of different organs in nutrition.
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Chapter Information
Subject: Science
Class: 7
Chapter: Nutrition in Animals
Question Type: Multiple Choice Questions (MCQs)
Practice Set: 11
Difficulty Level: Moderate to Difficult
Based On: NCERT Syllabus
Introduction
The process of digestion begins as soon as food enters the mouth. The mouth contains teeth and a tongue, while saliva released by the salivary glands begins the digestion of starch.
Teeth perform different functions such as cutting, tearing, and grinding food. The tongue helps in mixing food with saliva, tasting food, and swallowing it.
In this Practice Set 11, students will practise fresh MCQs related to teeth, tongue, saliva, chewing, digestive glands, and the beginning of digestion.
What You Will Learn
✔ Functions of different types of teeth
✔ Role of the tongue in digestion
✔ Importance of saliva
✔ Role of salivary glands
✔ Beginning of starch digestion
✔ Importance of chewing
✔ Functions of digestive organs and glands
Why This Topic Is Important
Digestion does not begin only after food reaches the stomach. The first stage of digestion starts in the mouth.
Understanding the functions of teeth, tongue, and saliva helps students understand how food is mechanically and chemically processed before it reaches the stomach.
Exam Relevance
These questions are useful for:
✔ CBSE School Exams
✔ State Board Exams
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ NCERT-Based Practice
✔ Science Revision
Q1. Which type of teeth is mainly used for cutting and biting food?
A) Canines
B) Incisors
C) Molars
D) Premolars
Answer:
B) Incisors
Useful Detail
Incisors are the front teeth. They have sharp edges and are mainly used for cutting and biting food.
Humans have different types of teeth because food needs to be processed in different ways. Incisors cut food, canines tear food, while premolars and molars help crush and grind it.
Therefore, incisors are especially suited for cutting and biting.
Correct Answer: B) Incisors
Q2. Which type of teeth is mainly used for tearing food?
A) Incisors
B) Canines
C) Molars
D) Premolars
Answer:
B) Canines
Useful Detail
Canines are pointed teeth located next to the incisors.
Their shape makes them suitable for tearing food. They are particularly useful for tearing tougher pieces of food.
The different shapes of teeth allow food to be cut, torn, crushed, and ground efficiently during chewing.
Correct Answer: B) Canines
Q3. Which function of the tongue is especially important during swallowing?
A) Producing bile
B) Pushing the chewed food towards the throat
C) Producing hydrochloric acid
D) Absorbing nutrients into the blood
Answer:
B) Pushing the chewed food towards the throat
Useful Detail
The tongue is a muscular organ that performs several functions during eating.
It helps mix food with saliva and moves the chewed food around the mouth. During swallowing, the tongue pushes the food towards the throat so that it can enter the oesophagus.
The tongue also helps us taste food because it contains taste receptors.
Correct Answer: B) Pushing the chewed food towards the throat
Q4. Why is chewing food properly important for digestion?
A) It increases the size of food particles.
B) It reduces the surface area of food.
C) It breaks food into smaller pieces and mixes it with saliva.
D) It stops digestion in the mouth.
Answer:
C) It breaks food into smaller pieces and mixes it with saliva.
Useful Detail
Chewing is a form of mechanical digestion. Teeth break food into smaller pieces, making it easier to swallow.
During chewing, food also mixes with saliva. Saliva contains salivary amylase, which begins the digestion of starch.
Therefore, thorough chewing supports both mechanical and chemical digestion.
Correct Answer: C) It breaks food into smaller pieces and mixes it with saliva.
Q5. Which statement about saliva is correct?
A) Saliva is produced by the liver.
B) Saliva begins the digestion of starch.
C) Saliva is stored in the gall bladder.
D) Saliva mainly digests proteins in the stomach.
Answer:
B) Saliva begins the digestion of starch.
Useful Detail
Saliva is produced by the salivary glands and released into the mouth.
It moistens food and makes it easier to chew and swallow. It also contains salivary amylase, which begins the digestion of starch.
Thus, saliva plays an important role at the very beginning of digestion.
Correct Answer: B) Saliva begins the digestion of starch.
Important Formulas & Concepts
Science Chapter 2 does not contain mathematical formulas. Important scientific concepts are given below.
1. Incisors
Incisors are front teeth mainly used for cutting and biting food.
2. Canines
Canines are pointed teeth mainly used for tearing food.
3. Premolars
Premolars help in crushing and grinding food.
4. Molars
Molars are broad teeth that are mainly used for grinding food.
5. Tongue
The tongue helps in tasting, mixing food with saliva, and moving food during swallowing.
6. Salivary Glands
Salivary glands produce saliva, which moistens food and contains salivary amylase.
7. Salivary Amylase
Salivary amylase begins the digestion of starch in the mouth.
8. Mechanical Digestion
Chewing breaks food into smaller pieces, making it easier to swallow and digest.
Related Practice Questions
Q1. What is the function of incisors?
Q2. Which teeth are used for tearing food?
Q3. What is the role of the tongue during digestion?
Q4. Which glands produce saliva?
Q5. Why should food be chewed properly?
Mini Quiz Challenge
Try answering these questions within 60 seconds.
Q1. Which teeth are located at the front of the mouth?
A) Molars
B) Canines
C) Incisors
D) Premolars
Q2. Canines are mainly used for:
A) Cutting
B) Tearing
C) Grinding
D) Absorbing nutrients
Q3. Salivary amylase acts mainly on:
A) Proteins
B) Fats
C) Starch
D) Vitamins
Q4. Which organ helps move food during swallowing?
A) Liver
B) Tongue
C) Pancreas
D) Small intestine
Q5. Saliva is produced by:
A) Salivary glands
B) Liver
C) Pancreas
D) Gall bladder
Exam Tips
✔ Remember the functions of the four main types of teeth.
✔ Incisors are mainly used for cutting.
✔ Canines are mainly used for tearing.
✔ Premolars and molars help crush and grind food.
✔ The tongue helps mix and move food.
✔ Salivary glands produce saliva.
✔ Salivary amylase begins starch digestion.
✔ Chewing is an important part of mechanical digestion.
Quick Revision Notes
✔ Incisors: Cut and bite food.
✔ Canines: Tear food.
✔ Premolars: Crush and grind food.
✔ Molars: Grind food.
✔ Tongue: Helps in tasting, mixing, and swallowing.
✔ Saliva: Moistens food and begins starch digestion.
✔ Salivary glands: Produce saliva.
✔ Salivary amylase: Begins digestion of starch.
Common Mistakes Students Make
❌ Thinking that canines are used mainly for grinding.
❌ Confusing the functions of incisors and molars.
❌ Thinking that saliva is produced by the tongue.
❌ Forgetting that salivary amylase acts on starch.
❌ Thinking digestion starts only in the stomach.
❌ Ignoring the role of chewing in mechanical digestion.
Key Takeaways
✔ Different teeth perform different functions.
✔ Incisors cut food.
✔ Canines tear food.
✔ Premolars and molars crush and grind food.
✔ The tongue helps mix and move food.
✔ Saliva moistens food and helps begin starch digestion.
✔ Salivary amylase is an important enzyme present in saliva.
✔ Digestion begins in the mouth.
FAQs
Q. What are incisors?
Answer:
Incisors are the front teeth that are mainly used for cutting and biting food.
Q. What is the function of canines?
Answer:
Canines are pointed teeth mainly used for tearing food.
Q. What is the role of the tongue in digestion?
Answer:
The tongue helps mix food with saliva, taste food, and move chewed food towards the throat during swallowing.
Q. Which enzyme is present in saliva?
Answer:
Saliva contains salivary amylase, which begins the digestion of starch.
Q. Why should we chew food properly?
Answer:
Chewing breaks food into smaller pieces and mixes it with saliva, making swallowing and digestion easier.
Conclusion
These Class 7 Science Chapter 2 Nutrition in Animals MCQ Questions with Answers and Useful Details – focus on the important functions of teeth, tongue, saliva, salivary glands, and chewing.
Understanding what happens inside the mouth helps students recognise that digestion begins before food reaches the stomach. Proper chewing and mixing with saliva prepare food for the next stages of digestion.
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