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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 application-based MCQs on photosynthesis, stomata, chlorophyll, symbiosis, and nitrogen fixation with detailed solutions for CBSE, State Board, Olympiad, and scholarship exam preparation.
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Chapter Information
Subject: Science
Class: 7
Chapter: Nutrition in Plants
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Moderate to Difficult
Based On: NCERT Latest Syllabus (2026)
Introduction
Plants are unique because they prepare their own food through photosynthesis. However, the process depends on several plant parts and environmental factors working together. This practice set focuses on application-based and reasoning-based questions to help students develop a deeper understanding of plant nutrition according to the latest NCERT syllabus.
What You Will Learn
✔ Conditions necessary for photosynthesis
✔ Importance of roots and stomata
✔ Nitrogen fixation
✔ Symbiotic relationships
✔ Plant nutrition concepts
✔ Application-based learning
✔ Exam-oriented practice
Why This Topic Is Important
The concepts of photosynthesis and plant nutrition form the basis for understanding advanced Biology. Questions based on reasoning and practical situations are frequently asked in school examinations, Olympiads, and scholarship tests.
1. MCQ Questions with Detailed Solutions
Q1. A plant is kept in a room where fresh air cannot enter. Which raw material required for photosynthesis will gradually become insufficient?
A) Water
B) Oxygen
C) Carbon Dioxide
D) Minerals
Answer
C) Carbon Dioxide
Concept Behind This Question
Carbon dioxide is obtained from the atmosphere and is essential for photosynthesis.
Step-by-Step Solution
Plants absorb carbon dioxide through stomata.
If fresh air is unavailable, the amount of carbon dioxide decreases.
As a result, photosynthesis slows down.
Therefore, the correct answer is C.
Exam Tip
Carbon dioxide is taken from the air, not the soil.
Q2. Which of the following pairs is correctly matched?
A) Rhizobium — Nitrogen Fixation
B) Mushroom — Photosynthesis
C) Cuscuta — Autotroph
D) Pitcher Plant — Root Nodules
Answer
A) Rhizobium — Nitrogen Fixation
Concept Behind This Question
Rhizobium bacteria convert atmospheric nitrogen into usable nitrogen compounds.
Step-by-Step Solution
Rhizobium lives in the root nodules of leguminous plants.
It helps convert atmospheric nitrogen into forms that plants can absorb.
Therefore, the correct answer is A.
Exam Tip
Rhizobium = Nitrogen Fixation
Q3. Which of the following best explains why green plants are called producers?
A) They absorb minerals.
B) They prepare their own food.
C) They produce seeds.
D) They produce flowers.
Answer
B) They prepare their own food.
Concept Behind This Question
Green plants are producers because they manufacture food through photosynthesis.
Step-by-Step Solution
Using sunlight, carbon dioxide, water, and chlorophyll, green plants prepare glucose.
This food also supports animals and humans indirectly.
Hence, green plants are called producers.
Therefore, the correct answer is B.
Exam Tip
Producer = Makes Its Own Food
Q4. In a lichen, what is the main benefit received by the fungus?
A) It gets sunlight.
B) It receives prepared food from the alga.
C) It absorbs insects.
D) It produces chlorophyll.
Answer
B) It receives prepared food from the alga.
Concept Behind This Question
In symbiosis, both organisms benefit.
Step-by-Step Solution
The alga performs photosynthesis and prepares food.
The fungus receives this food while providing water, minerals, and shelter.
Thus, both organisms benefit.
Therefore, the correct answer is B.
Exam Tip
Alga → Food | Fungus → Water & Protection
Q5. Which statement is correct regarding insectivorous plants?
A) They do not perform photosynthesis.
B) They trap insects only to obtain nitrogen.
C) They absorb food through roots.
D) They cannot survive in sunlight.
Answer
B) They trap insects only to obtain nitrogen.
Concept Behind This Question
Insectivorous plants prepare their own food but require insects to obtain nitrogen.
Step-by-Step Solution
These plants contain chlorophyll and perform photosynthesis.
However, they grow in nitrogen-deficient soil.
They trap insects to obtain nitrogen needed for healthy growth.
Therefore, the correct answer is B.
Exam Tip
Insectivorous Plants = Photosynthesis + Nitrogen from Insects
Important Formulas & Concepts
1. Producer
An organism that prepares its own food through photosynthesis.
2. Rhizobium
Nitrogen-fixing bacteria found in the root nodules of leguminous plants.
3. Lichen
A symbiotic association between an alga and a fungus.
4. Carbon Dioxide
Absorbed from the atmosphere through stomata.
5. Insectivorous Plants
Prepare food by photosynthesis but obtain nitrogen by trapping insects.
Related Practice Questions
- Why are green plants called producers?
- What is the function of Rhizobium bacteria?
- Explain the relationship between algae and fungi in lichens.
- Why do insectivorous plants trap insects?
- How do plants obtain carbon dioxide?
Mini Quiz Challenge
Fill in the blanks
- Green plants are called __________.
- Rhizobium helps in __________ fixation.
- The fungus in lichen receives __________ from the alga.
Answers
- Producers
- Nitrogen
- Food
Exam Tips
✔ Revise the concept of producers.
✔ Learn the role of Rhizobium bacteria.
✔ Remember the benefits of symbiosis.
✔ Practice reasoning-based MCQs.
✔ Understand why insectivorous plants trap insects.
Quick Revision Notes
✔ Green plants are producers.
✔ Rhizobium fixes atmospheric nitrogen.
✔ Carbon dioxide enters through stomata.
✔ Algae prepare food in lichens.
✔ Fungi provide water and protection.
✔ Insectivorous plants obtain nitrogen from insects.
✔ Photosynthesis supports all food chains.
Common Mistakes Students Make
❌ Thinking insectivorous plants depend entirely on insects for food.
❌ Confusing Rhizobium with fungi.
❌ Forgetting that carbon dioxide comes from the atmosphere.
❌ Assuming fungi prepare food in lichens.
❌ Believing all non-green plants are parasites.
Key Takeaways
✔ Green plants are producers.
✔ Rhizobium fixes atmospheric nitrogen.
✔ Lichens are examples of symbiosis.
✔ Carbon dioxide is absorbed through stomata.
✔ Insectivorous plants prepare food but trap insects for nitrogen.
✔ Photosynthesis is essential for life on Earth.
FAQs
1. Why are green plants called producers?
Because they prepare their own food through photosynthesis.
2. What is the role of Rhizobium bacteria?
Rhizobium converts atmospheric nitrogen into usable compounds for plants.
3. What is a lichen?
A lichen is a symbiotic association between an alga and a fungus.
4. Why do insectivorous plants trap insects?
They trap insects to obtain nitrogen from nitrogen-deficient environments.
5. How do plants obtain carbon dioxide?
Plants absorb carbon dioxide from the atmosphere through stomata.
Conclusion
Photosynthesis and plant nutrition are fundamental concepts in Biology. Understanding the roles of producers, Rhizobium bacteria, lichens, and insectivorous plants helps students answer both conceptual and application-based questions with confidence. Regular NCERT-based MCQ practice strengthens scientific thinking and prepares students for school exams and Olympiads.
Related links
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- Class 7 English Chapter 1 The Rainbow part-6
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-10
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