In this Class 7 Science chapter 10, we explore some most important Life Processes in Plants – photosynthesis, respiration, and transportation..
Plants are living organisms just like animals. However, unlike animals, plants prepare their own food. To stay alive, grow, and reproduce, plants perform several life processes.
In this chapter, we learn how plants make food using sunlight, water, and carbon dioxide, how food and water are transported inside plants, how plants respire, and how these processes help maintain balance in nature.
Life Processes in Plants Worksheet
Our worksheets provides a wide variety of practice questions such as MCQs, fill in the blanks, and short & long answer questions. Aligned with the latest curriculum our worksheet encourages critical thinking through concept-based activities, experiments, and real-life applications.
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Through simple observations and activities, this chapter helps us understand:
- How plants carry out essential life processes needed for their survival and growth
- The process of photosynthesis to make their own food
- Why leaves are called food factories of plants
- How plants exchange gases like oxygen and carbon dioxide
- How plants respire to release energy required for growth
This chapter builds a strong foundation for understanding essential life processes in plants and how they maintain balance in nature, supporting all living organisms..
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Science Class 7 chapter 10 Study Notes
How Do Plants Grow?
- Plants grow by increasing in height, number of leaves, and thickness of stem.
- Sunlight and water are essential for plant growth.
Experiments show:
- Plants with sunlight + water grow best.
- It dies without water.
- Plants without sunlight turn pale and weak.
How Do Plants Get Food?
Leaves are Food Factory of plants
- Leaves prepare food and store it as starch.
- They are green due to chlorophyll.
- Chlorophyll absorbs sunlight.
Starch Test
- Iodine solution turns blue-black in presence of starch.
- Only green parts of leaf turn blue-black → shows food is made there.
Photosynthesis
Photosynthesis is the process by which green plants prepare food using sunlight.
Requirements:
- Sunlight
- Water
- Carbon dioxide
- Chlorophyll
Products: Glucose (stored as starch) + Oxygen
Word Equation: Carbon dioxide + Water → Glucose + Oxygen (in presence of sunlight and chlorophyll)
Exchange of Gases
Leaves have tiny pores called stomata.
Stomata help in:
- Taking in carbon dioxide
- Releasing oxygen during photosynthesis
- Gas exchange during respiration
Transport in Plants
- Roots absorb water and minerals.
- Xylem carries water upward from roots to leaves.
- Food prepared in leaves is transported by phloem.
- Food may be stored in roots, fruits, seeds, etc.
Respiration in Plants
- Plants respire day and night.
- During respiration:
- Glucose is broken down
- Oxygen is used
- Energy is released
Word Equation: Glucose + Oxygen → Carbon dioxide + Water + Energy
Life Processes in Plants Question Answers
Q1. What is photosynthesis?
Ans: Photosynthesis is the process by which green plants prepare their own food using carbon dioxide and water in the presence of sunlight and chlorophyll. During this process, glucose is formed and oxygen is released.
Q2. Why is chlorophyll important for plants?
Ans: Chlorophyll is a green pigment that absorbs sunlight. The absorbed light energy is used to convert carbon dioxide and water into food during photosynthesis.
Q3. Name the raw materials needed for photosynthesis.
Ans: The raw materials required are carbon dioxide, water, sunlight, and chlorophyll.
Q4. What are stomata? State their function.
Ans: Stomata are tiny pores present on the surface of leaves. They help in the exchange of gases such as oxygen and carbon dioxide during photosynthesis and respiration.
Q5. Why do plants need energy?
Ans: Plants need energy for growth, repair, reproduction, and other life processes. This energy is obtained through respiration.