Quiz Class 7th Science 25-04-2026

Chapter Information

• Class: 7
• Subject: Science
• Chapter: Nutrition in Plants & Nutrition in Animals (Mixed MCQs)
• Topic: Digestion, Photosynthesis, Parasitic Plants & Human Body
• Difficulty Level: Easy
• Based On: Latest NCERT
• Total Questions: 5
• Suitable For: School Exams, Unit Test, Half-Yearly, Annual Exam & Olympiad Preparation

Introduction

Nutrition is one of the most important topics in Class 7 Science. Plants prepare their own food through photosynthesis, while animals and humans depend on digestion to obtain nutrients. Understanding the digestive system, body functions, and different types of plants helps students build a strong foundation in biology.

This MCQ set is designed according to the latest NCERT syllabus with detailed explanations to improve conceptual understanding.

What You Will Learn

After completing these MCQs, you will learn:

• The acid present in the human stomach.
• The meaning of digestion.
• Normal human body temperature.
• Identification of parasitic plants.
• The plant part where photosynthesis takes place.

Why This Topic Is Important

This topic is important because:

• It is frequently asked in school examinations.
• It forms the foundation for higher biology concepts.
• It helps students understand how food is prepared and digested.
• Questions from digestion and photosynthesis often appear in competitive exams and Olympiads.
• Strong concepts improve overall science performance.

5 MCQs with Detailed Solutions

Question 1

Which acid is present in our stomach to kill bacteria?

1. Sulphuric acid
2. Citric acid
3. Hydrochloric acid
4. Acetic acid

Correct Answer: Hydrochloric acid (HCl)

Detailed Solution

Hydrochloric acid (HCl) is secreted by the stomach lining. It creates an acidic environment that kills harmful bacteria present in food and also activates digestive enzymes like pepsin for protein digestion.

Exam Fact: Hydrochloric acid does not digest the stomach because the stomach is protected by a mucus lining.

Question 2

The process of breakdown of food into simpler substances is called:

1. Respiration
2. Excretion
3. Circulation
4. Digestion

Correct Answer: Digestion

Detailed Solution

Digestion is the process of breaking complex food into simpler substances that the body can absorb and use for energy, growth, and repair.

• Mouth → Chewing begins digestion.
• Stomach → Food mixes with digestive juices.
• Small intestine → Most digestion and absorption occur.

Question 3

Normal body temperature of a healthy human is:

1. 30°C
2. 45°C
3. 98°C
4. 37°C

Correct Answer: 37°C

Detailed Solution

The normal body temperature of a healthy human is 37°C, which is also equal to 98.6°F. The human body maintains this temperature through a process called thermoregulation.

Remember: 37°C = 98.6°F

Question 4

Which of the following is a parasite plant?

1. Mango
2. Cuscuta (Amarbel)
3. Pitcher plant
4. Rose

Correct Answer: Cuscuta (Amarbel)

Detailed Solution

Cuscuta (Amarbel) is a parasitic plant because it cannot prepare enough food on its own. It absorbs water and nutrients from another plant using special structures called haustoria.

Interesting Fact: Cuscuta usually appears as yellow thread-like stems wrapped around host plants.

Question 5

Photosynthesis occurs in which part of the plant?

1. Stem
2. Root
3. Leaf
4. Flower

Correct Answer: Leaf

Detailed Solution

Photosynthesis mainly takes place in the leaves because they contain chlorophyll inside chloroplasts. During this process, plants prepare food using sunlight, carbon dioxide, and water.

Photosynthesis produces:

• Glucose (Food)
• Oxygen

Leaves are therefore called the food factories of plants.

Important Formulas & Concepts

Hydrochloric Acid (HCl)

• Present in the stomach.
• Kills harmful bacteria.
• Helps in protein digestion.

Digestion

• Conversion of complex food into simple absorbable substances.

Normal Body Temperature

• 37°C (98.6°F)

Photosynthesis

Word Equation

Carbon Dioxide + Water → Glucose + Oxygen (in the presence of sunlight and chlorophyll)

Cuscuta

• Parasitic plant
• Depends on host plants for nutrition.

Related Practice Questions

1. Which enzyme begins digestion in the mouth?
2. Which organ absorbs digested food?
3. Why are leaves green?
4. Which gas is released during photosynthesis?
5. Name one insectivorous plant.
6. Which pigment is necessary for photosynthesis?
7. Which organ stores food temporarily after swallowing?
8. Why do parasites depend on host plants?

Mini Quiz Challenge

Try answering these without looking at the solutions.

Q1. Which organ secretes hydrochloric acid?

1. Liver
2. Stomach
3. Kidney
4. Pancreas

Q2. Which gas is taken in during photosynthesis?

1. Oxygen
2. Carbon dioxide
3. Nitrogen
4. Hydrogen

Answers:

1. 2
2. 2

Exam Tips

• Remember that Hydrochloric acid is found only in the stomach, not in the mouth.
• Never confuse Digestion with Respiration.
• Learn the normal body temperature as 37°C (98.6°F).
• Cuscuta is a parasitic plant, while the pitcher plant is an insectivorous plant.
• Photosynthesis mainly occurs in the leaves because they contain chlorophyll.

Quick Revision Notes

• Hydrochloric acid kills harmful bacteria in the stomach.
• Digestion converts food into simpler substances.
• Normal human body temperature is 37°C.
• Cuscuta is a parasitic plant.
• Leaves are the primary site of photosynthesis.
• Chlorophyll is essential for photosynthesis.
• Photosynthesis produces glucose and oxygen.

Common Mistakes Students Make

• Confusing hydrochloric acid with sulphuric acid.
• Thinking respiration and digestion are the same process.
• Writing 98°C instead of 98.6°F or 37°C.
• Confusing parasitic plants with insectivorous plants.
• Believing photosynthesis occurs in roots or flowers instead of leaves.

Key Takeaways

• Hydrochloric acid protects the stomach by killing harmful bacteria.
• Digestion helps the body absorb nutrients from food.
• The normal body temperature of a healthy person is 37°C.
• Cuscuta depends on another plant for nutrition.
• Leaves are the main organs where photosynthesis takes place.

FAQs

1. Which acid is present in the human stomach?

Hydrochloric acid (HCl) is present in the human stomach.

2. What is digestion?

Digestion is the process of breaking complex food into simpler substances for absorption.

3. What is the normal body temperature of a healthy human?

The normal body temperature is 37°C (98.6°F).

4. Why is Cuscuta called a parasitic plant?

Because it depends on another plant for food and nutrients.

5. Where does photosynthesis occur?

Photosynthesis mainly occurs in the leaves because they contain chlorophyll.

Conclusion

These NCERT-based Class 7 Science MCQs cover important concepts related to nutrition in plants and animals. Regular practice of such objective questions helps improve conceptual understanding, boosts confidence, and prepares students for school examinations and competitive tests. Revise these concepts regularly for better performance.

NCERT Reference

Source: NCERT Class 7 Science

• Chapter 1 – Nutrition in Plants
• Chapter 2 – Nutrition in Animals

Difficulty Level: Easy