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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 the human digestive system, peristalsis, stomach digestion, digestive juices, small intestine, and nutrient absorption.
Do You Know
Chapter Information
Subject: Science
Class: 7
Chapter: Nutrition in Animals
Question Type: Multiple Choice Questions (MCQs)
Practice Set: 10
Difficulty Level: Moderate to Difficult
Based On: NCERT Syllabus
Introduction
The human digestive system consists of several organs that work together to process food. Food is first taken into the mouth, where it is chewed and mixed with saliva. It then passes through the oesophagus and reaches the stomach.
The movement of food through the alimentary canal is supported by muscular contractions. Different digestive juices act on food at different stages, helping convert complex nutrients into simpler substances.
This Practice Set 10 focuses on the movement of food, stomach digestion, digestive juices, the role of the small intestine, and absorption of nutrients.
What You Will Learn
✔ Movement of food through the alimentary canal
✔ Role of muscular contractions
✔ Functions of the stomach
✔ Role of hydrochloric acid
✔ Importance of digestive juices
✔ Functions of the small intestine
✔ Absorption of nutrients
Why This Topic Is Important
The digestive system is not simply a tube through which food passes. Each organ performs a specific function, and the coordinated movement of food allows digestion and absorption to take place properly.
Understanding these processes helps students answer conceptual and application-based questions about human nutrition.
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. What causes food to move through the oesophagus towards the stomach?
A) Gravity alone
B) Muscular contractions of the oesophagus
C) Bile
D) Saliva pushing the food
Answer:
B) Muscular contractions of the oesophagus
Useful Detail
The walls of the alimentary canal contain muscles that contract and relax to push food forward.
The rhythmic muscular movement that helps propel food through the alimentary canal is called peristalsis.
Therefore, food does not depend only on gravity to travel from the mouth to the stomach.
Correct Answer: B) Muscular contractions of the oesophagus
Q2. Which combination of substances is secreted by the stomach and helps in digestion?
A) Hydrochloric acid and digestive juices
B) Bile and saliva
C) Pancreatic juice and bile
D) Only water
Answer:
A) Hydrochloric acid and digestive juices
Useful Detail
The stomach releases hydrochloric acid and digestive juices.
Hydrochloric acid creates an acidic environment that supports the action of the enzyme pepsin and also helps destroy many harmful microorganisms that may enter with food.
The stomach also churns food, mixing it with digestive secretions.
Correct Answer: A) Hydrochloric acid and digestive juices
Q3. Which organ receives bile and pancreatic juice for digestion?
A) Mouth
B) Oesophagus
C) Small intestine
D) Large intestine
Answer:
C) Small intestine
Useful Detail
The small intestine receives bile from the liver and pancreatic juice from the pancreas.
These secretions help digest carbohydrates, proteins, and fats. Digestive juices from the intestinal wall also contribute to the completion of digestion.
The small intestine is therefore an important site where digestion is completed and nutrients are absorbed.
Correct Answer: C) Small intestine
Q4. What is the main purpose of muscular movement in the alimentary canal?
A) To produce bile
B) To move and mix food
C) To produce blood
D) To absorb oxygen
Answer:
B) To move and mix food
Useful Detail
Muscular contractions in the walls of the alimentary canal help move food from one organ to another.
These contractions also help mix food with digestive juices, allowing enzymes to act more effectively.
The coordinated movement of food is an important part of digestion.
Correct Answer: B) To move and mix food
Q5. Why is the small intestine well suited for absorption of digested food?
A) It contains teeth.
B) It has numerous villi that increase the surface area.
C) It stores food for several days.
D) It produces saliva.
Answer:
B) It has numerous villi that increase the surface area.
Useful Detail
The inner lining of the small intestine contains numerous tiny finger-like projections called villi.
Villi greatly increase the surface area available for absorption. They also contain blood vessels that help carry absorbed nutrients to different parts of the body.
This structure makes the small intestine highly efficient at absorbing digested nutrients.
Correct Answer: B) It has numerous villi that increase the surface area.
Important Formulas & Concepts
Science Chapter 2 does not contain mathematical formulas. Important scientific concepts are given below.
1. Peristalsis
Peristalsis is the rhythmic contraction and relaxation of muscles in the alimentary canal that helps move food forward.
2. Stomach
The stomach stores and churns food and mixes it with gastric juices.
3. Hydrochloric Acid
Hydrochloric acid provides an acidic medium in the stomach and supports the action of pepsin.
4. Pepsin
Pepsin is a digestive enzyme that helps break down proteins.
5. Small Intestine
The small intestine receives bile and pancreatic juice, completes much of digestion, and absorbs nutrients.
6. Villi
Villi are finger-like projections that increase the surface area for absorption.
7. Digestive Juices
Digestive juices contain substances and enzymes that help break down complex food into simpler substances.
Related Practice Questions
Q1. What is peristalsis?
Q2. Why does the stomach contain hydrochloric acid?
Q3. What is the role of pepsin?
Q4. Why does the small intestine contain villi?
Q5. Which digestive juices enter the small intestine?
Mini Quiz Challenge
Try answering these questions within 60 seconds.
Q1. The movement of food through the oesophagus is mainly due to:
A) Peristalsis
B) Respiration
C) Photosynthesis
D) Diffusion
Q2. Which organ churns food and mixes it with gastric juices?
A) Mouth
B) Stomach
C) Large intestine
D) Rectum
Q3. Hydrochloric acid is present in the:
A) Mouth
B) Stomach
C) Large intestine
D) Oesophagus
Q4. Bile enters the:
A) Small intestine
B) Oesophagus
C) Mouth
D) Rectum
Q5. Villi mainly help in:
A) Chewing
B) Absorption
C) Swallowing
D) Egestion
Exam Tips
✔ Remember the meaning of peristalsis.
✔ Food is moved through the oesophagus by muscular contractions.
✔ The stomach churns food and mixes it with gastric juices.
✔ Hydrochloric acid creates an acidic environment in the stomach.
✔ Pepsin helps in protein digestion.
✔ Bile and pancreatic juice enter the small intestine.
✔ Villi increase the surface area for absorption.
Quick Revision Notes
✔ Peristalsis: Muscular movement that pushes food through the alimentary canal.
✔ Stomach: Stores and churns food.
✔ Hydrochloric acid: Creates an acidic medium in the stomach.
✔ Pepsin: Helps digest proteins.
✔ Small intestine: Major site of digestion and absorption.
✔ Bile: Produced by liver and helps in fat digestion.
✔ Pancreatic juice: Produced by pancreas.
✔ Villi: Increase surface area for nutrient absorption.
Common Mistakes Students Make
❌ Thinking that food moves through the oesophagus only because of gravity.
❌ Confusing peristalsis with digestion.
❌ Thinking that hydrochloric acid is produced by the liver.
❌ Forgetting that bile enters the small intestine.
❌ Thinking that villi digest food instead of helping in absorption.
❌ Assuming that the stomach is the main site of nutrient absorption.
Key Takeaways
✔ Food moves through the alimentary canal by muscular contractions.
✔ Peristalsis helps push food forward.
✔ The stomach churns food and mixes it with digestive juices.
✔ Hydrochloric acid creates an acidic environment in the stomach.
✔ Pepsin helps digest proteins.
✔ Bile and pancreatic juice act in the small intestine.
✔ Villi make the small intestine efficient at absorbing nutrients.
FAQs
Q. What is peristalsis?
Answer:
Peristalsis is the rhythmic contraction and relaxation of muscles in the alimentary canal that helps move food forward.
Q. Why is hydrochloric acid present in the stomach?
Answer:
Hydrochloric acid creates an acidic medium that supports the action of pepsin and helps kill many harmful microorganisms.
Q. What is the function of the stomach?
Answer:
The stomach temporarily stores food, churns it, and mixes it with gastric juices to begin important stages of digestion.
Q. Why are villi present in the small intestine?
Answer:
Villi increase the surface area of the small intestine, allowing digested nutrients to be absorbed efficiently.
Q. Where do bile and pancreatic juice act?
Answer:
Bile and pancreatic juice enter and act in the small intestine.
Conclusion
These Class 7 Science Chapter 2 Nutrition in Animals MCQ Questions with Answers and Useful Details – cover important concepts related to peristalsis, stomach functions, hydrochloric acid, pepsin, bile, pancreatic juice, the small intestine, and villi.
Understanding the movement of food and the functions of digestive organs helps students develop a clear understanding of human nutrition and digestion.
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