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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 questions on starch test, chlorophyll, insectivorous plants, nutrients, and photosynthesis 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 prepare their own food through photosynthesis, but this process depends on several essential factors such as sunlight, chlorophyll, carbon dioxide, and water. Scientists have also developed simple experiments to prove that leaves produce food. This practice set focuses on important NCERT concepts that help students strengthen their understanding of plant nutrition.
What You Will Learn
✔ Test for starch in leaves
✔ Importance of iodine solution
✔ Factors affecting photosynthesis
✔ Nutrients required by plants
✔ Insectivorous plants
✔ Functions of roots
✔ NCERT-based exam concepts
Why This Topic Is Important
Understanding how plants prepare and store food is essential for learning Biology. These concepts are frequently asked in school examinations, Olympiads, scholarship tests, and competitive exams based on the NCERT syllabus.
1. MCQ Questions with Detailed Solutions
Q1. Which solution is used to test the presence of starch in a leaf?
A) Salt solution
B) Sugar solution
C) Iodine solution
D) Lime water
Answer
C) Iodine solution
Concept Behind This Question
Iodine solution changes its colour in the presence of starch.
Step-by-Step Solution
After performing the starch test on a leaf, iodine solution is added.
If starch is present, the leaf turns blue-black.
Therefore, iodine solution is used to detect starch.
Hence, the correct answer is C.
Exam Tip
Iodine + Starch = Blue-Black Colour
Q2. Which part of a plant absorbs water and minerals from the soil?
A) Flower
B) Stem
C) Roots
D) Fruit
Answer
C) Roots
Concept Behind This Question
Roots absorb water and minerals that are essential for photosynthesis and plant growth.
Step-by-Step Solution
Roots anchor the plant in the soil and absorb:
- Water
- Minerals
These materials are transported to the leaves for food preparation.
Therefore, the correct answer is C.
Exam Tip
Roots = Water + Minerals
Q3. Which of the following is the main food prepared by plants?
A) Protein
B) Fat
C) Glucose
D) Vitamins
Answer
C) Glucose
Concept Behind This Question
Photosynthesis produces glucose, which may later be stored as starch.
Step-by-Step Solution
Plants prepare glucose during photosynthesis.
Some of this glucose is immediately used for energy, while the remaining is stored as starch.
Hence, the correct answer is C.
Exam Tip
Glucose = First food prepared by plants
Q4. Why do insectivorous plants trap insects?
A) To obtain water
B) To obtain sunlight
C) To obtain nitrogen
D) To obtain oxygen
Answer
C) To obtain Nitrogen
Concept Behind This Question
Insectivorous plants grow in nitrogen-deficient soil.
Step-by-Step Solution
The soil where insectivorous plants grow lacks sufficient nitrogen.
To overcome this deficiency, they trap and digest insects.
Thus, they obtain nitrogen and other nutrients.
Therefore, the correct answer is C.
Exam Tip
Remember:
Insectivorous plants eat insects for nitrogen, not for energy.
Q5. During the starch test, a leaf is first boiled in alcohol to:
A) Increase water content
B) Remove chlorophyll
C) Remove starch
D) Add minerals
Answer
B) Remove Chlorophyll
Concept Behind This Question
Removing chlorophyll makes the colour change with iodine clearly visible.
Step-by-Step Solution
In the starch experiment:
- The leaf is first boiled in water.
- Then it is boiled in alcohol to remove chlorophyll.
- Finally, iodine solution is added.
Without chlorophyll, the blue-black colour becomes easier to observe.
Hence, the correct answer is B.
Exam Tip
Alcohol removes chlorophyll before the iodine test.
Important Formulas & Concepts
1. Starch Test
Iodine Solution + Starch → Blue-Black Colour
2. Function of Roots
Roots absorb water and minerals from the soil.
3. Food Prepared by Plants
Plants prepare glucose, which is often stored as starch.
4. Insectivorous Plants
Plants that trap insects to obtain nitrogen.
Examples:
- Pitcher Plant
- Venus Flytrap
5. Chlorophyll Removal
Alcohol is used to remove chlorophyll during the starch experiment.
Related Practice Questions
- Why is iodine used in the starch test?
- Why is chlorophyll removed before testing a leaf?
- What is the function of roots?
- Why do insectivorous plants trap insects?
- In which form do plants store excess food?
Mini Quiz Challenge
Fill in the blanks
- Plants store excess food as __________.
- Iodine solution turns __________ in the presence of starch.
- Roots absorb water and __________ from the soil.
Answers
- Starch
- Blue-black
- Minerals
Exam Tips
✔ Remember the steps of the starch experiment.
✔ Learn the function of roots.
✔ Revise why insectivorous plants trap insects.
✔ Practice important NCERT activities.
✔ Understand the difference between glucose and starch.
Quick Revision Notes
✔ Glucose is prepared during photosynthesis.
✔ Excess glucose is stored as starch.
✔ Iodine detects starch.
✔ Alcohol removes chlorophyll.
✔ Roots absorb water and minerals.
✔ Insectivorous plants obtain nitrogen from insects.
✔ Blue-black colour confirms starch.
Common Mistakes Students Make
❌ Thinking plants directly prepare starch.
❌ Confusing glucose with chlorophyll.
❌ Forgetting why alcohol is used in the starch test.
❌ Assuming insectivorous plants trap insects for food only.
❌ Ignoring the role of roots in photosynthesis.
Key Takeaways
✔ Plants prepare glucose through photosynthesis.
✔ Excess glucose is stored as starch.
✔ Iodine solution is used to test starch.
✔ Alcohol removes chlorophyll before the starch test.
✔ Roots absorb water and minerals.
✔ Insectivorous plants obtain nitrogen from insects.
FAQs
1. Why is iodine solution used in the starch test?
It detects the presence of starch by turning blue-black.
2. Why is alcohol used during the experiment?
Alcohol removes chlorophyll so that the colour change can be seen clearly.
3. What food do plants prepare?
Plants prepare glucose through photosynthesis.
4. Where do plants store excess food?
Plants generally store excess food as starch.
5. Why do insectivorous plants digest insects?
They digest insects to obtain nitrogen from nutrient-poor soil.
Conclusion
Photosynthesis not only helps plants prepare food but also supports life on Earth by producing oxygen. Understanding experiments such as the starch test and learning the importance of roots, glucose, and chlorophyll helps students develop strong conceptual knowledge. Regular MCQ practice improves confidence and exam performance.
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