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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 reasoning-based MCQs on photosynthesis, chlorophyll, starch, stomata, 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 to Difficult
Based On: NCERT Latest Syllabus (2026)
Introduction
Plants perform photosynthesis to prepare food, but this process depends on several important factors such as sunlight, chlorophyll, carbon dioxide, and water. Understanding these concepts helps students explain everyday natural phenomena and answer reasoning-based questions confidently. This practice set focuses on higher-order thinking questions based on the NCERT syllabus.
What You Will Learn
✔ Factors affecting photosynthesis
✔ Importance of chlorophyll
✔ Function of stomata
✔ Starch formation
✔ Role of roots
✔ Reasoning-based NCERT concepts
✔ Exam-oriented MCQs
Why This Topic Is Important
Many examination questions are now concept-based rather than memory-based. Understanding why photosynthesis occurs and how different plant parts contribute to food preparation helps students perform better in school exams, Olympiads, and scholarship tests.
1. MCQ Questions with Detailed Solutions
Q1. Why are green leaves called the “food factories” of plants?
A) They store water.
B) They produce seeds.
C) They prepare food through photosynthesis.
D) They absorb minerals.
Answer
C) They prepare food through photosynthesis.
Concept Behind This Question
Leaves contain chlorophyll, which helps prepare food.
Step-by-Step Solution
Green leaves contain chloroplasts with chlorophyll.
They absorb sunlight and prepare glucose through photosynthesis.
Therefore, they are called the food factories of plants.
Hence, the correct answer is C.
Exam Tip
Leaf = Main site of photosynthesis
Q2. A leaf does not turn blue-black after adding iodine solution. What is the most likely reason?
A) Starch is absent in the leaf.
B) Oxygen is absent.
C) Nitrogen is absent.
D) Water is absent.
Answer
A) Starch is absent in the leaf.
Concept Behind This Question
Iodine turns blue-black only in the presence of starch.
Step-by-Step Solution
If starch has not been produced, iodine will not change colour.
This usually indicates that photosynthesis did not produce starch in that leaf.
Therefore, the correct answer is A.
Exam Tip
No Blue-Black Colour = No Starch
Q3. Which plant part transports water absorbed by roots to the leaves?
A) Flower
B) Fruit
C) Stem
D) Seed
Answer
C) Stem
Concept Behind This Question
The stem transports water and minerals from roots to all parts of the plant.
Step-by-Step Solution
Roots absorb water and minerals.
The stem carries them upward to the leaves through conducting tissues.
Leaves then use the water during photosynthesis.
Therefore, the correct answer is C.
Exam Tip
Roots absorb → Stem transports → Leaves prepare food
Q4. Which condition is essential for photosynthesis but is not obtained from the soil?
A) Water
B) Nitrogen
C) Carbon Dioxide
D) Minerals
Answer
C) Carbon Dioxide
Concept Behind This Question
Carbon dioxide is absorbed from the atmosphere through stomata.
Step-by-Step Solution
Plants absorb:
- Water and minerals from the soil.
- Carbon dioxide from the air.
Thus, carbon dioxide is not obtained from the soil.
Therefore, the correct answer is C.
Exam Tip
CO₂ comes from air, not soil.
Q5. Which of the following statements is correct about photosynthesis?
A) It takes place only in roots.
B) It prepares food only at night.
C) It requires chlorophyll and sunlight.
D) It occurs only in flowers.
Answer
C) It requires chlorophyll and sunlight.
Concept Behind This Question
Chlorophyll and sunlight are essential conditions for photosynthesis.
Step-by-Step Solution
Photosynthesis occurs mainly in green leaves.
Chlorophyll absorbs sunlight, which provides energy for food preparation.
Without either of them, photosynthesis cannot occur effectively.
Therefore, the correct answer is C.
Exam Tip
No Chlorophyll or No Sunlight = No Photosynthesis
Important Formulas & Concepts
1. Food Factory
Leaves are called the food factories of plants because they perform photosynthesis.
2. Iodine Test
Blue-Black Colour = Presence of Starch
3. Stem
The stem transports water and minerals from roots to leaves.
4. Carbon Dioxide
Plants obtain carbon dioxide from the atmosphere through stomata.
5. Essential Conditions for Photosynthesis
- Sunlight
- Chlorophyll
- Carbon Dioxide
- Water
Related Practice Questions
- Why are leaves called food factories?
- Why is iodine solution used in the starch test?
- What is the function of the stem?
- How do plants obtain carbon dioxide?
- What are the essential conditions for photosynthesis?
Mini Quiz Challenge
Fill in the blanks
- The stem transports __________ to the leaves.
- Carbon dioxide enters through __________.
- A blue-black colour after adding iodine indicates the presence of __________.
Answers
- Water and minerals
- Stomata
- Starch
Exam Tips
✔ Revise the iodine test carefully.
✔ Learn the functions of roots, stems, and leaves.
✔ Remember where plants obtain carbon dioxide.
✔ Practice reasoning-based NCERT questions.
✔ Focus on concept-based learning rather than memorization.
Quick Revision Notes
✔ Leaves prepare food.
✔ Stems transport water.
✔ Roots absorb water and minerals.
✔ Carbon dioxide comes from the atmosphere.
✔ Starch gives a blue-black colour with iodine.
✔ Chlorophyll traps sunlight.
✔ Photosynthesis requires sunlight and chlorophyll.
Common Mistakes Students Make
❌ Thinking stems prepare food.
❌ Assuming carbon dioxide comes from the soil.
❌ Forgetting the role of iodine solution.
❌ Confusing the functions of roots and stems.
❌ Thinking photosynthesis occurs at night.
Key Takeaways
✔ Leaves are the food factories of plants.
✔ Stems transport water and minerals.
✔ Carbon dioxide enters through stomata.
✔ Starch is detected by iodine solution.
✔ Chlorophyll and sunlight are essential for photosynthesis.
✔ Photosynthesis produces food for plants.
FAQs
1. Why are leaves called food factories?
Because they prepare food through photosynthesis.
2. Why does iodine turn blue-black?
Because it reacts with starch present in the leaf.
3. What is the function of the stem?
The stem transports water and minerals from roots to leaves.
4. From where do plants obtain carbon dioxide?
Plants obtain carbon dioxide from the atmosphere through stomata.
5. What are the essential conditions for photosynthesis?
Sunlight, chlorophyll, carbon dioxide, and water.
Conclusion
Understanding how different plant parts work together during photosynthesis helps students build strong scientific concepts. Topics such as the starch test, transport of water, and the role of carbon dioxide are essential for school exams and higher-level competitive examinations. Regular practice of NCERT-based MCQs improves conceptual understanding and confidence.
Related links
- Class 7 English Chapter 1 The Rainbow part-5
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-9
- Class 7 Maths Chapter 4 Simple Equations-part-1
- Class 7 Science Chapter 1 Nutrition in Plants part-8
- Class 7 English Chapter 1 The Rainbow-part-4
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-8
- Class 7 Science Chapter 1 Nutrition in Plants part-7
- Class 7 Maths Chapter 3 Data Handling part-8
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-7
- Class 7 Science Chapter 1 Nutrition in Plants part-6
- Class 7 Maths Chapter 3 Data Handling part-7
- Class 7 English Chapter 1 The Rainbow part-3
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