Important questions class 7 science chapter 10 help students revise Life Processes in Plants through exam-focused answers. This chapter explains how plants make food, exchange gases, transport water, move food, and release energy.
Life Processes in Plants is a key Class 7 Science chapter because it connects photosynthesis, stomata, xylem, phloem, and respiration. These concepts often appear as short answers, MCQs, experiment-based questions, and application questions in school exams.
Introduction to Life Processes in Plants
Plants are living organisms, but they do not eat food like animals. They prepare their own food using sunlight, water, carbon dioxide, and chlorophyll.
Class 7 Science Chapter 10 explains this process step by step. Students learn why leaves are called food factories, how stomata help in gas exchange, how xylem and phloem transport materials, and why plants respire throughout the day and night.
Key Takeaways
| Concept |
What Students Should Remember |
| Plant growth |
Plants need sunlight, water, air, and nutrients |
| Leaves |
Leaves are the main sites of photosynthesis |
| Chlorophyll |
Green pigment that traps sunlight |
| Photosynthesis |
Carbon dioxide + Water → Glucose + Oxygen |
| Stomata |
Tiny pores that help in gas exchange |
| Xylem |
Carries water and minerals from roots upward |
| Phloem |
Carries food from leaves to other plant parts |
| Respiration |
Glucose + Oxygen → Carbon dioxide + Water + Energy |
| Iodine test |
Blue-black colour confirms starch |
| Lime water test |
Milky lime water confirms carbon dioxide |
Overview of Important Questions Class 7 Science Chapter 10
Class 7 Science Chapter 10 important questions focus on how plants perform life processes. Students should understand each concept with examples, activities, and word equations.
The chapter mainly tests photosynthesis, gas exchange, transport in plants, and respiration. Most questions are based on textbook activities, diagrams, and reasoning-based situations.
Important questions class 7 science chapter 10 for quick revision
These questions help students revise the chapter before exams:
- What is photosynthesis?
- Why are leaves called food factories?
- What is the role of chlorophyll?
- Why is sunlight needed for photosynthesis?
- What are stomata?
- What is the function of xylem?
- What is the function of phloem?
- How do plants respire?
- Why does lime water turn milky in the respiration experiment?
- How is starch tested in leaves?
Class 7 Science Important Questions for All Chapters
Important Topics in Class 7 Science Chapter 10
This chapter becomes easier when students divide it into smaller topics. Each topic connects with one life process in plants.
Students should revise definitions, activity-based conclusions, and differences between similar processes. This helps in MCQs, short answers, and long answers.
Plant growth
Plants grow when they get water, sunlight, air, and nutrients from the soil. Growth can be seen through new leaves, taller stems, thicker stems, flowers, and fruits.
Leaves as food factories
Leaves are called food factories because they prepare food through photosynthesis. They contain chlorophyll, which helps capture sunlight.
Photosynthesis
Photosynthesis is the process by which green plants prepare glucose using carbon dioxide and water. This process happens in the presence of sunlight and chlorophyll.
The word equation is:
Carbon dioxide + Water → Glucose + Oxygen
Stomata
Stomata are tiny pores found mainly on the lower surface of leaves. They allow carbon dioxide to enter and oxygen to leave during photosynthesis.
Xylem and phloem
Xylem transports water and minerals from roots to other parts. Phloem transports food made in leaves to roots, stems, fruits, and seeds.
Respiration in plants
Plants respire in all their parts throughout the day and night. During respiration, glucose breaks down using oxygen to release energy.
The word equation is:
Glucose + Oxygen → Carbon dioxide + Water + Energy
Class 7 Science Chapter 10 Notes
Class 7 science chapter 10 notes should focus on definitions, activities, equations, and examples. These points help students revise quickly before a test.
Plants perform two important processes related to food and energy. Photosynthesis makes food, while respiration releases energy from food.
- Photosynthesis happens only in green parts of plants.
- Respiration happens in all living parts of plants.
- Xylem carries water and minerals.
- Phloem carries prepared food.
- Stomata control the exchange of gases.
- Chlorophyll is needed to trap sunlight.
- Oxygen is released during photosynthesis.
- Carbon dioxide is released during respiration.
Life Processes in Plants Class 7 Important Questions
Life processes in plants class 7 important questions test whether students can explain concepts in simple words. They also check if students understand textbook activities.
Students should write direct answers and include keywords such as photosynthesis, chlorophyll, stomata, xylem, phloem, and respiration.
Q1. What is photosynthesis?
Photosynthesis is the process by which green plants use sunlight, carbon dioxide, water, and chlorophyll to prepare glucose and release oxygen.
Q2. Why do plants need sunlight?
Plants need sunlight because it provides energy for photosynthesis. Without sunlight, plants cannot prepare food properly.
Q3. What is chlorophyll?
Chlorophyll is the green pigment present in leaves and other green parts of plants. It helps plants trap sunlight for photosynthesis.
Q4. Why are leaves called food factories of plants?
Leaves are called food factories because they prepare food for the plant. This food is made through photosynthesis.
Q5. What gas is released during photosynthesis?
Oxygen is released during photosynthesis.
Q6. What gas is released during respiration in plants?
Carbon dioxide is released during respiration in plants.
Q7. In what form do plants store food?
Plants store food in the form of starch.
Q8. What are stomata?
Stomata are tiny pores on the surface of leaves. They help in the exchange of gases.
Q9. What is xylem?
Xylem is a plant tissue that transports water and minerals from roots to other parts.
Q10. What is phloem?
Phloem is a plant tissue that transports food from leaves to other parts of the plant.
Life Processes in Plants Class 7 Questions and Answers
These life processes in plants class 7 questions and answers help students practise short-answer questions. Most answers should be written in 2–3 clear sentences.
Q1. Why do plants need both sunlight and water for growth?
Plants need sunlight for photosynthesis. Water is also a raw material used in photosynthesis. Without sunlight or water, food production is affected.
Q2. Why are leaves usually broad and flat?
Broad and flat leaves can absorb more sunlight. Their shape also helps carbon dioxide enter easily through stomata.
Q3. What does the iodine test show in a leaf?
The iodine test shows the presence of starch. If the leaf turns blue-black, starch is present.
Q4. Why does a plant kept in the dark not show starch in its leaves?
A plant kept in the dark does not get sunlight. Without sunlight, photosynthesis does not occur, so starch is not formed.
Q5. What happens to glucose after photosynthesis?
Glucose is used by the plant for energy and growth. Extra glucose gets converted into starch for storage.
Q6. Do only leaves carry out photosynthesis?
No. Any green part of a plant with chlorophyll can carry out photosynthesis. Leaves are the main sites of photosynthesis.
Photosynthesis Class 7 Questions and Answers
Photosynthesis class 7 questions and answers often appear in exams because the topic connects food, oxygen, starch, and sunlight. Students should remember the word equation and the role of each raw material.
The main requirements for photosynthesis are sunlight, chlorophyll, carbon dioxide, and water. If one of these is missing, photosynthesis cannot happen properly.
Q1. Write the word equation for photosynthesis.
Carbon dioxide + Water → Glucose + Oxygen
This reaction happens in the presence of sunlight and chlorophyll.
Q2. What is the role of carbon dioxide in photosynthesis?
Carbon dioxide is a raw material for photosynthesis. Plants take it from the air through stomata.
Q3. What is the role of chlorophyll in photosynthesis?
Chlorophyll traps sunlight. This sunlight energy helps plants convert carbon dioxide and water into glucose.
Q4. How can we prove that sunlight is needed for photosynthesis?
Keep a plant in the dark for some time and then test its leaves with iodine. The leaves do not turn blue-black because starch is not formed without sunlight.
Q5. Why is oxygen called a product of photosynthesis?
Oxygen is released when plants prepare glucose during photosynthesis. It is not used as a raw material in this process.
Stomata Class 7 Science Questions
Stomata class 7 science questions mainly test gas exchange in leaves. Students should know their location, structure, and function.
Stomata are important because photosynthesis and respiration both require the exchange of gases. They help the leaf take in and release gases at the right time.
Q1. Where are stomata found?
Stomata are found mainly on the lower surface of leaves.
Q2. What is the main function of stomata?
Stomata help in the exchange of gases. They allow carbon dioxide to enter and oxygen to leave during photosynthesis.
Q3. What are guard cells?
Guard cells are cells around each stoma. They control the opening and closing of stomata.
Q4. Why are stomata important for photosynthesis?
Stomata allow carbon dioxide to enter the leaf. Carbon dioxide is needed to prepare glucose during photosynthesis.
Q5. Do stomata help in respiration?
Yes. During respiration, oxygen enters and carbon dioxide leaves through stomata.
Xylem and Phloem Class 7 Questions
Xylem and phloem class 7 questions are common because students often confuse their functions. The easiest way to remember them is this: xylem carries water, while phloem carries food.
Both tissues are tube-like structures present in stems, branches, and leaves. They help transport materials inside the plant.
Q1. What does xylem transport?
Xylem transports water and minerals from roots to stems, leaves, and other parts.
Q2. What does phloem transport?
Phloem transports food prepared in leaves to all parts of the plant.
Q3. How does water move from roots to leaves?
Water absorbed by roots moves upward through xylem. It reaches stems, branches, and leaves.
Q4. How does food reach roots and seeds?
Food prepared in leaves travels through phloem. It reaches roots, seeds, fruits, and other parts.
Q5. Give one difference between xylem and phloem.
Xylem carries water and minerals from roots upward. Phloem carries prepared food from leaves to other plant parts.
Experiment-Based Questions from Class 7 Science Chapter 10
Experiment-based questions test whether students understand why each step is done. These questions are important for school exams.
Students should mention the aim, observation, and conclusion clearly. This makes answers complete and easy to score.
Q1. What does the iodine test prove?
The iodine test proves the presence of starch in a leaf. A blue-black colour shows that starch is present.
Q2. Why is a leaf boiled in alcohol before the iodine test?
The leaf is boiled in alcohol to remove chlorophyll. This makes the colour change easier to see.
Q3. Why is a plant kept in the dark before the starch test?
The plant is kept in the dark to remove stored starch. This process is called destarching.
Q4. How does the caustic soda experiment prove that carbon dioxide is needed?
Caustic soda absorbs carbon dioxide. The part of the leaf without carbon dioxide does not form starch, proving that carbon dioxide is necessary.
Q5. How can oxygen release during photosynthesis be shown?
A water plant is kept in sunlight under an inverted funnel and test tube. Bubbles collect in the tube, and the gas supports burning, showing it is oxygen.
Q6. What does the red-ink experiment prove?
The red ink moves upward through the stem. This proves that xylem carries water in plants.
Q7. Why does lime water turn milky in the seed respiration experiment?
Germinating seeds release carbon dioxide during respiration. Carbon dioxide turns lime water milky.
Life Processes in Plants MCQ Class 7
These life processes in plants mcq class 7 questions help students revise facts quickly. MCQs also test whether students can identify the correct process, tissue, or gas.
Q1. Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b) Oxygen
Q2. Which substance turns blue-black with iodine?
a) Glucose
b) Oxygen
c) Starch
d) Water
Answer: c) Starch
Q3. Which plant tissue carries water and minerals?
a) Phloem
b) Xylem
c) Stomata
d) Chlorophyll
Answer: b) Xylem
Q4. Which tissue carries food in plants?
a) Xylem
b) Phloem
c) Root hair
d) Guard cell
Answer: b) Phloem
Q5. Which pigment traps sunlight?
a) Chlorophyll
b) Starch
c) Glucose
d) Carbon dioxide
Answer: a) Chlorophyll
Q6. Where are stomata mainly found?
a) Lower surface of leaves
b) Roots
c) Seeds
d) Flowers
Answer: a) Lower surface of leaves
Q7. What is produced during respiration?
a) Glucose
b) Oxygen
c) Energy
d) Chlorophyll
Answer: c) Energy
Q8. Which gas turns lime water milky?
a) Oxygen
b) Carbon dioxide
c) Hydrogen
d) Nitrogen
Answer: b) Carbon dioxide
Q9. Which part is the main site of photosynthesis?
a) Root
b) Leaf
c) Flower
d) Seed
Answer: b) Leaf
Q10. Which of these is not required for photosynthesis?
a) Sunlight
b) Chlorophyll
c) Carbon dioxide
d) Oxygen
Answer: d) Oxygen
Life Processes in Plants Extra Questions and Answers
These life processes in plants extra questions and answers help students practise application-based questions. They are useful for higher-scoring exam answers.
Students should explain the reason, not only write the final answer. This improves clarity and marks.
Q1. A potato slice turns blue-black with iodine. Where did the starch come from?
The starch came from glucose prepared in leaves during photosynthesis. This glucose moved through phloem to the potato and got stored as starch.
Q2. Why do plants respire if they already make food?
Plants make food through photosynthesis, but they need energy to use that food. Respiration breaks down glucose and releases energy.
Q3. Can photosynthesis happen without chlorophyll?
No. Chlorophyll is needed to trap sunlight. Without it, the plant cannot prepare food properly.
Q4. Why do plants not photosynthesise at night?
Photosynthesis needs sunlight. At night, sunlight is absent, so the process stops.
Q5. Do plants respire only at night?
No. Plants respire during the day and night. Respiration happens in all living cells continuously.
Q6. How do photosynthesis and respiration balance gases in nature?
Photosynthesis uses carbon dioxide and releases oxygen. Respiration uses oxygen and releases carbon dioxide.
Q7. What happens if a plant does not get water?
The plant cannot carry out photosynthesis properly. It may wilt and eventually die.
Q8. Why do non-green parts of a plant depend on leaves?
Non-green parts cannot make food because they lack chlorophyll. They receive food from leaves through phloem.
Class 7 Science Chapter 10 Question Answer Practice
This class 7 science chapter 10 question answer section helps students revise the full chapter in one place. These questions are useful for quick oral revision and written practice.
Q1. Name the four requirements of photosynthesis.
The four requirements are sunlight, chlorophyll, carbon dioxide, and water.
Q2. What is the final product of photosynthesis?
The main food product is glucose. Oxygen is released as a by-product.
Q3. Why is starch tested instead of glucose in leaves?
Glucose is quickly used or converted into starch. Starch is easier to test with iodine.
Q4. Which tissue connects roots and leaves for water transport?
Xylem connects roots and leaves for water and mineral transport.
Q5. Which tissue distributes prepared food?
Phloem distributes food prepared in leaves to all plant parts.
Q6. Why are germinating seeds used in the respiration experiment?
Germinating seeds respire actively. They release enough carbon dioxide to turn lime water milky.
Q7. What happens when photosynthesis stops for a long time?
The plant cannot make food. Its growth slows down, leaves may turn yellow, and it may die.
Most Important Questions from Chapter 10 for 2026 Exams
Use this section for final revision before school exams. These questions cover the most tested concepts from the chapter.
Q1. Write the word equation for photosynthesis.
Q2. Write the word equation for respiration in plants.
Q3. Why are leaves called food factories?
Q4. What is chlorophyll? Why is it important?
Q5. What does the iodine test prove?
Q6. Why is carbon dioxide necessary for photosynthesis?
Q7. How does the caustic soda experiment prove the role of carbon dioxide?
Q8. What are stomata? State their function.
Q9. Differentiate between xylem and phloem.
Q10. Describe the red-ink experiment and its conclusion.
Q11. Why does lime water turn milky during the seed respiration experiment?
Q12. Do plants respire during the day? Give a reason.