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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. Test your knowledge of digestion in humans, the role of enzymes, absorption, assimilation, and the functions of digestive organs.
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Chapter Information
Subject: Science
Class: 7
Chapter: Nutrition in Animals
Question Type: Multiple Choice Questions (MCQs)
Practice Set: 5
Difficulty Level: Moderate
Based On: NCERT Syllabus
Introduction
The human digestive system is a complex system in which different organs work together to process food. Digestion changes complex food substances into simpler substances that can be absorbed and used by the body.
The mouth, stomach, small intestine, and large intestine each have important roles. Digestive glands such as the liver and pancreas also contribute important substances required for digestion.
This Practice Set 5 focuses on enzymes, digestion of different nutrients, absorption, assimilation, and the functions of digestive organs.
What You Will Learn
✔ Role of digestive enzymes
✔ Digestion of carbohydrates
✔ Digestion of proteins
✔ Digestion of fats
✔ Absorption and assimilation
✔ Functions of the small intestine
✔ Role of the large intestine
Why This Topic Is Important
Different nutrients require different digestive enzymes and processes. Understanding these differences helps students explain how the body obtains useful nutrients from food.
These concepts are important for conceptual questions, MCQs, diagrams, and short-answer questions in school examinations.
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 enzyme present in saliva begins the digestion of starch?
A) Pepsin
B) Salivary amylase
C) Lipase
D) Trypsin
Answer:
B) Salivary amylase
Useful Detail
Saliva is secreted by the salivary glands and mixes with food during chewing.
It contains an enzyme called salivary amylase, which begins the digestion of starch into simpler substances.
This is why proper chewing is important: it allows food to mix thoroughly with saliva.
Correct Answer: B) Salivary amylase
Q2. Which nutrient is mainly digested by the enzyme pepsin in the stomach?
A) Carbohydrates
B) Proteins
C) Fats
D) Vitamins
Answer:
B) Proteins
Useful Detail
Pepsin is a digestive enzyme present in the stomach.
It helps break down proteins into simpler substances. The acidic environment of the stomach, created by hydrochloric acid, supports the action of pepsin.
Protein digestion therefore begins significantly in the stomach.
Correct Answer: B) Proteins
Q3. What is the main role of absorption in nutrition?
A) Taking food into the mouth
B) Breaking food into smaller pieces by chewing
C) Passing digested nutrients into the blood
D) Removing undigested food
Answer:
C) Passing digested nutrients into the blood
Useful Detail
After digestion, food has been converted into simpler substances that the body can use.
These digested nutrients pass through the walls of the small intestine and enter the blood. This process is called absorption.
The blood then transports the nutrients to different parts of the body.
Correct Answer: C) Passing digested nutrients into the blood
Q4. What does assimilation mean?
A) Taking food into the body
B) Breaking food into simpler substances
C) Using absorbed nutrients for body functions
D) Removing undigested food
Answer:
C) Using absorbed nutrients for body functions
Useful Detail
After nutrients are absorbed into the blood, they are transported to different parts of the body.
The body uses these nutrients for energy, growth, repair, and other functions. This utilisation of absorbed nutrients is called assimilation.
Thus, absorption and assimilation are different processes.
Correct Answer: C) Using absorbed nutrients for body functions
Q5. Which pair is correctly matched?
A) Liver — Produces saliva
B) Pancreas — Produces pancreatic juice
C) Stomach — Stores bile
D) Gall bladder — Produces bile
Answer:
B) Pancreas — Produces pancreatic juice
Useful Detail
The pancreas produces pancreatic juice, which contains digestive enzymes that help digest carbohydrates, proteins, and fats.
The liver produces bile, while the gall bladder stores bile.
Saliva is produced by the salivary glands, and the stomach does not store bile.
Therefore, the correctly matched pair is pancreas and pancreatic juice.
Correct Answer: B) Pancreas — Produces pancreatic juice
Important Formulas & Concepts
Science Chapter 2 does not contain mathematical formulas. Important scientific concepts are given below.
1. Salivary Amylase
Salivary amylase is an enzyme in saliva that begins the digestion of starch.
2. Pepsin
Pepsin is a stomach enzyme that helps digest proteins.
3. Absorption
Absorption is the process by which digested nutrients pass into the blood, mainly through the small intestine.
4. Assimilation
Assimilation is the utilisation of absorbed nutrients by the body.
5. Pancreatic Juice
Pancreatic juice is produced by the pancreas and contains enzymes that help digest carbohydrates, proteins, and fats.
6. Bile
Bile is produced by the liver and helps in the digestion of fats.
7. Digestive Enzymes
Digestive enzymes help break complex food substances into simpler substances that can be absorbed by the body.
Related Practice Questions
Q1. What is the function of salivary amylase?
Q2. Which nutrient is digested by pepsin?
Q3. What is absorption?
Q4. What is assimilation?
Q5. Which organ produces pancreatic juice?
Mini Quiz Challenge
Try answering these questions within 60 seconds.
Q1. Which enzyme begins starch digestion?
A) Pepsin
B) Salivary amylase
C) Lipase
D) Trypsin
Q2. Pepsin helps digest:
A) Proteins
B) Fats
C) Minerals
D) Water
Q3. Absorption mainly takes place in the:
A) Stomach
B) Oesophagus
C) Small intestine
D) Mouth
Q4. The utilisation of absorbed nutrients is called:
A) Ingestion
B) Digestion
C) Assimilation
D) Egestion
Q5. Pancreatic juice is produced by:
A) Liver
B) Pancreas
C) Stomach
D) Gall bladder
Exam Tips
✔ Remember the functions of important digestive enzymes.
✔ Salivary amylase begins starch digestion.
✔ Pepsin helps in protein digestion.
✔ Absorption mainly occurs in the small intestine.
✔ Assimilation means utilisation of absorbed nutrients.
✔ The pancreas produces pancreatic juice.
✔ The liver produces bile.
✔ Do not confuse digestion, absorption, and assimilation.
Quick Revision Notes
✔ Salivary amylase: Begins starch digestion.
✔ Pepsin: Helps digest proteins in the stomach.
✔ Bile: Produced by the liver and helps in fat digestion.
✔ Pancreatic juice: Produced by the pancreas.
✔ Absorption: Digested nutrients enter the blood.
✔ Assimilation: Absorbed nutrients are used by the body.
✔ Small intestine: Major site of digestion and absorption.
✔ Egestion: Removal of undigested food.
Common Mistakes Students Make
❌ Thinking that pepsin digests carbohydrates.
❌ Confusing absorption with assimilation.
❌ Saying that pancreatic juice is produced by the liver.
❌ Thinking that bile is produced by the gall bladder.
❌ Assuming that digestion and absorption are the same process.
❌ Forgetting that salivary amylase begins starch digestion.
Key Takeaways
✔ Digestive enzymes help break down complex food.
✔ Salivary amylase begins starch digestion.
✔ Pepsin helps digest proteins in the stomach.
✔ Pancreatic juice contains enzymes that act on different nutrients.
✔ Absorption transfers digested nutrients into the blood.
✔ Assimilation involves the utilisation of absorbed nutrients.
✔ The small intestine is a major site of digestion and absorption.
FAQs
Q. Which enzyme is present in saliva?
Answer:
Saliva contains the enzyme salivary amylase, which begins the digestion of starch.
Q. What does pepsin digest?
Answer:
Pepsin helps in the digestion of proteins in the stomach.
Q. What is absorption?
Answer:
Absorption is the process by which digested nutrients pass through the intestinal wall into the blood.
Q. What is assimilation?
Answer:
Assimilation is the utilisation of absorbed nutrients by the body for energy, growth, repair, and other functions.
Q. Which organ produces pancreatic juice?
Answer:
The pancreas produces pancreatic juice.
Conclusion
These Class 7 Science Chapter 2 Nutrition in Animals MCQ Questions with Answers and Useful Details – cover important concepts related to digestive enzymes, starch and protein digestion, absorption, assimilation, pancreatic juice, and digestive organs.
The questions are designed to strengthen students’ understanding of how food is digested and how useful nutrients are absorbed and utilised by the body.
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