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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 photosynthesis, starch, saprotrophs, parasites, and plant nutrition 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
Based On: NCERT Latest Syllabus (2026)
Introduction
Plants use sunlight to prepare food through photosynthesis, making them the primary producers in every ecosystem. However, not all plants and organisms obtain nutrition in the same way. This practice set focuses on application-based and concept-based MCQs to improve understanding and exam performance.
What You Will Learn
✔ Food storage in plants
✔ Role of chlorophyll
✔ Types of heterotrophic nutrition
✔ Importance of carbon dioxide
✔ Photosynthesis experiments
✔ Plant nutrients
✔ NCERT exam-oriented concepts
Why This Topic Is Important
The concepts covered in this chapter help students understand how plants survive, grow, and support life on Earth. These topics frequently appear in school examinations, Olympiads, scholarship tests, and other competitive exams based on the NCERT syllabus.
1. MCQ Questions with Detailed Solutions
Q1. During photosynthesis, solar energy is stored in the form of:
A) Heat energy
B) Wind energy
C) Chemical energy in glucose
D) Sound energy
Answer
C) Chemical energy in glucose
Concept Behind This Question
Photosynthesis converts light energy into chemical energy stored in food.
Step-by-Step Solution
Plants capture sunlight using chlorophyll.
This energy is used to prepare glucose.
The energy remains stored in glucose as chemical energy.
Therefore, the correct answer is C.
Exam Tip
Photosynthesis stores solar energy as chemical energy.
Q2. Which of the following is an example of a saprotrophic organism?
A) Cuscuta
B) Mushroom
C) Neem
D) Sunflower
Answer
B) Mushroom
Concept Behind This Question
Saprotrophs obtain nutrients from dead and decaying organic matter.
Step-by-Step Solution
Mushrooms release digestive enzymes onto dead matter.
They absorb the dissolved nutrients instead of preparing their own food.
Therefore, mushroom is a saprotroph.
Hence, the correct answer is B.
Exam Tip
Saprotroph = Feeds on dead and decaying matter.
Q3. Which gas is directly used by plants to prepare food?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Hydrogen
Answer
C) Carbon Dioxide
Concept Behind This Question
Carbon dioxide is one of the raw materials required for photosynthesis.
Step-by-Step Solution
Plants absorb carbon dioxide from the atmosphere through stomata.
It combines with water in the presence of sunlight to produce glucose.
Therefore, the correct answer is C.
Exam Tip
CO₂ enters, O₂ comes out.
Q4. Which observation confirms the presence of starch in a leaf?
A) The leaf becomes green.
B) The leaf becomes yellow.
C) The leaf turns blue-black after adding iodine.
D) The leaf becomes transparent.
Answer
C) The leaf turns blue-black after adding iodine.
Concept Behind This Question
The iodine test is used to detect starch in leaves.
Step-by-Step Solution
After removing chlorophyll with alcohol, iodine solution is added.
If starch is present, the leaf turns blue-black.
This confirms that photosynthesis has taken place.
Therefore, the correct answer is C.
Exam Tip
Blue-Black Colour = Starch Present
Q5. Which statement correctly describes a parasite?
A) It prepares its own food.
B) It depends on dead plants for food.
C) It obtains food from a living host.
D) It traps insects for nitrogen.
Answer
C) It obtains food from a living host.
Concept Behind This Question
Parasitic plants depend on living organisms for nutrition.
Step-by-Step Solution
Parasitic plants like Cuscuta attach themselves to a host plant.
They absorb water and nutrients from the host.
Therefore, they obtain food from a living organism.
Hence, the correct answer is C.
Exam Tip
Parasite = Living Host
Important Formulas & Concepts
1. Photosynthesis
Plants convert sunlight into chemical energy stored as glucose.
2. Iodine Test
Iodine + Starch → Blue-Black Colour
3. Saprotrophs
Organisms that feed on dead and decaying organic matter.
Examples:
- Mushroom
- Bread Mould
4. Parasitic Plants
Plants that obtain food from living host plants.
Example:
- Cuscuta
5. Carbon Dioxide
A raw material required for photosynthesis.
Related Practice Questions
- What is the function of carbon dioxide in photosynthesis?
- Why is iodine used in the starch test?
- Give two examples of saprotrophs.
- Define parasitic nutrition.
- How is solar energy stored in plants?
Mini Quiz Challenge
Fill in the blanks
- Plants store solar energy as __________ energy.
- The iodine test detects __________.
- Cuscuta depends on a living __________.
Answers
- Chemical
- Starch
- Host
Exam Tips
✔ Learn the starch test carefully.
✔ Revise examples of parasites and saprotrophs.
✔ Remember the role of carbon dioxide.
✔ Practice application-based MCQs.
✔ Focus on NCERT activities and experiments.
Quick Revision Notes
✔ Photosynthesis stores energy in glucose.
✔ Carbon dioxide is a raw material.
✔ Mushroom is a saprotroph.
✔ Cuscuta is a parasite.
✔ Iodine detects starch.
✔ Chlorophyll is essential for photosynthesis.
✔ Oxygen is released during photosynthesis.
Common Mistakes Students Make
❌ Confusing parasites with saprotrophs.
❌ Thinking oxygen is absorbed during photosynthesis.
❌ Forgetting the colour change in the iodine test.
❌ Mixing glucose with starch.
❌ Assuming all plants prepare their own food.
Key Takeaways
✔ Photosynthesis converts light energy into chemical energy.
✔ Carbon dioxide is essential for preparing food.
✔ Starch is detected using iodine solution.
✔ Mushroom is a saprotroph.
✔ Cuscuta is a parasitic plant.
✔ Green plants are the primary producers in nature.
FAQs
1. Why is carbon dioxide important for plants?
Carbon dioxide is a raw material required for photosynthesis.
2. What is the iodine test used for?
It is used to detect the presence of starch in leaves.
3. What is a saprotroph?
A saprotroph obtains nutrients from dead and decaying organic matter.
4. Which plant is a parasite?
Cuscuta is a parasitic plant.
5. In what form is solar energy stored in plants?
Solar energy is stored as chemical energy in glucose.
Conclusion
Understanding photosynthesis, starch formation, and different modes of nutrition helps students appreciate how plants sustain life on Earth. Regular practice of NCERT-based MCQs improves conceptual understanding, logical thinking, and confidence in school exams and Olympiad-level questions.
Related links
- Class 7 Maths Chapter 3 Data Handling part-6
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-5
- Class 7 Maths Chapter 3 Data Handling part-5
- Class 7 Science Chapter 1 Nutrition in Plants part-4
- Class 7 English Chapter 1 The Rainbow part-2
- Class 7 Science Chapter 1 Nutrition in Plants part-3
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-4
- Class 7 Maths Chapter 3 Data Handling part-4
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-3
- Class 7 Science Chapter 1 Nutrition in Plants part-3
- Class 7 Maths Chapter 3 Data Handling part-3
- Class 7 English Chapter 1 The Rainbow part-1
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