Class 7 Science Chapter 1 Nutrition in Plants

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Practice Class 7 Science Chapter 1 Nutrition in Plants MCQ Questions with Answers based on the latest NCERT syllabus. Solve important MCQs on stomata, autotrophs, nutrients, symbiotic relationships, and lichens with detailed solutions for school exams and Olympiad preparation.

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Chapter Information

Subject: Science

Class: 7

Chapter: Nutrition in Plants

Question Type: Multiple Choice Questions (MCQs)

Difficulty Level: Easy to Moderate

Based On: NCERT Latest Syllabus (2026)

Introduction

Plants are called producers because they prepare their own food through photosynthesis. However, not all plants obtain nutrition in the same way. Some plants depend on other organisms, while others live in partnership with fungi or bacteria. This practice set helps students strengthen their understanding of important concepts from the chapter through carefully selected NCERT-based MCQs.

What You Will Learn

✔ Meaning of autotrophs

✔ Function of stomata

✔ Raw materials for photosynthesis

✔ Symbiotic relationships

✔ Lichens and Rhizobium bacteria

✔ Importance of nutrients for plants

✔ NCERT-based concepts for exams

Why This Topic Is Important

This chapter introduces students to the different ways plants obtain nutrition and explains how nature maintains balance through various relationships among organisms. These concepts are frequently tested in school exams, Olympiads, scholarship tests, and other competitive examinations.

1. MCQ Questions with Detailed Solutions

Q1. Plants that prepare their own food are called:

A) Parasites

B) Saprotrophs

C) Autotrophs

D) Consumers

Answer

C) Autotrophs

Concept Behind This Question

Autotrophs are organisms that can manufacture their own food using simple substances.

Step-by-Step Solution

Green plants use carbon dioxide, water, sunlight, and chlorophyll to prepare food through photosynthesis.

Therefore, plants that make their own food are known as autotrophs.

Hence, the correct answer is C.

Exam Tip

Auto = Self
Autotroph = Self-feeding organism

Q2. Tiny pores present on the surface of leaves are called:

A) Roots

B) Veins

C) Stomata

D) Petals

Answer

C) Stomata

Concept Behind This Question

Stomata help in the exchange of gases during photosynthesis and respiration.

Step-by-Step Solution

Leaves contain tiny openings called stomata.

They allow carbon dioxide to enter and oxygen and water vapour to leave.

Thus, the correct answer is C.

Exam Tip

Stomata = Gas exchange in leaves

Q3. Which nutrient is supplied naturally to plants by Rhizobium bacteria?

A) Phosphorus

B) Potassium

C) Nitrogen

D) Calcium

Answer

C) Nitrogen

Concept Behind This Question

Rhizobium bacteria fix atmospheric nitrogen into a usable form for plants.

Step-by-Step Solution

Rhizobium lives in the root nodules of leguminous plants.

It converts atmospheric nitrogen into nitrogen compounds that plants can absorb.

Therefore, the correct answer is C.

Exam Tip

Rhizobium → Nitrogen Fixation

Q4. Lichens are an example of:

A) Parasitic relationship

B) Symbiotic relationship

C) Predator-prey relationship

D) Competition

Answer

B) Symbiotic Relationship

Concept Behind This Question

In symbiosis, two different organisms live together and both benefit.

Step-by-Step Solution

A lichen consists of:

• An alga
• A fungus

The alga prepares food by photosynthesis.

The fungus provides water, minerals, and shelter.

Both benefit from the relationship.

Hence, the correct answer is B.

Exam Tip

Lichen = Alga + Fungus = Symbiosis

Q5. Which of the following is NOT required for photosynthesis?

A) Sunlight

B) Carbon dioxide

C) Water

D) Oxygen

Answer

D) Oxygen

Concept Behind This Question

Oxygen is released during photosynthesis but is not a raw material.

Step-by-Step Solution

Plants require:

• Sunlight
• Carbon dioxide
• Water
• Chlorophyll

Oxygen is produced as a by-product.

Therefore, the correct answer is D.

Exam Tip

Remember the formula:

Carbon Dioxide + Water + Sunlight + Chlorophyll → Food + Oxygen

Important Formulas & Concepts

1. Autotrophs

Organisms that prepare their own food through photosynthesis.

2. Stomata

Tiny pores on leaf surfaces that help in gaseous exchange.

3. Rhizobium

Nitrogen-fixing bacteria found in the root nodules of leguminous plants.

4. Symbiosis

A relationship in which both organisms benefit from living together.

Example: Lichen

5. Photosynthesis Requirements

• Sunlight
• Carbon Dioxide
• Water
• Chlorophyll

Related Practice Questions

1. What are autotrophs?
2. What is the function of stomata?
3. Explain nitrogen fixation.
4. What is a symbiotic relationship?
5. Why are lichens considered examples of symbiosis?

Mini Quiz Challenge

Fill in the blanks

1. Tiny pores on leaves are called __________.
2. Rhizobium bacteria help in fixing __________.
3. Lichens are an example of __________.

Answers

1. Stomata
2. Nitrogen
3. Symbiosis

Exam Tips

✔ Learn the function of stomata.

✔ Remember the role of Rhizobium bacteria.

✔ Understand the meaning of autotrophs and heterotrophs.

✔ Revise examples of symbiotic relationships.

✔ Read NCERT diagrams carefully.

Quick Revision Notes

✔ Green plants are autotrophs.

✔ Stomata help in gas exchange.

✔ Rhizobium fixes atmospheric nitrogen.

✔ Lichens show symbiosis.

✔ Oxygen is released during photosynthesis.

✔ Chlorophyll is essential for photosynthesis.

✔ Leguminous plants contain root nodules.

Common Mistakes Students Make

❌ Thinking oxygen is required for photosynthesis.

❌ Confusing stomata with roots.

❌ Forgetting the function of Rhizobium.

❌ Mixing parasitic and symbiotic relationships.

❌ Assuming lichens are single organisms.

Key Takeaways

✔ Autotrophs prepare their own food.

✔ Stomata allow gaseous exchange.

✔ Rhizobium helps plants obtain nitrogen.

✔ Lichens are formed by algae and fungi.

✔ Oxygen is a product of photosynthesis.

✔ Symbiosis benefits both organisms.

FAQs

1. What are stomata?

Stomata are tiny pores on the surface of leaves that help in the exchange of gases.

2. What is the role of Rhizobium bacteria?

Rhizobium fixes atmospheric nitrogen into a form that plants can use.

3. What is symbiosis?

Symbiosis is a relationship in which two different organisms live together and both benefit.

4. What are lichens?

Lichens are made up of an alga and a fungus living together in a symbiotic relationship.

5. Is oxygen needed for photosynthesis?

No. Oxygen is produced during photosynthesis; it is not a raw material.

Conclusion

Understanding concepts such as autotrophs, stomata, nitrogen fixation, and symbiosis helps students develop a deeper understanding of plant nutrition. Regular practice of NCERT-based MCQs improves conceptual clarity and prepares students for school exams, Olympiads, and scholarship tests.

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