Why is photosynthesis important for plants?

Photosynthesis helps plants prepare their own food using sunlight, water, and carbon dioxide. It also releases oxygen into the atmosphere, which is necessary for the survival of living organisms. This process is essential for maintaining ecological balance in nature.

What is the role of stomata in plants?

Stomata help in gaseous exchange by allowing carbon dioxide to enter leaves and oxygen to exit. They also regulate water loss through transpiration. Guard cells control the opening and closing of stomata according to environmental conditions.

How do Selina solutions help students learn respiration?

Selina solutions explain respiration with simple examples and easy language. Students can practice textbook exercises, differences, and definitions effectively. These solutions improve conceptual clarity and help students prepare accurate answers for school examinations.

Selina Class 7 Biology Solutions Chapter 4 Photosynthesis and Respiration

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Selina Class 7 Biology Solutions Chapter-4 Photosynthesis and Respiration

Introduction to Photosynthesis and Respiration

Photosynthesis and respiration are two essential life processes explained in Chapter 4 of the ICSE biology syllabus. Selina Class 7 Biology Solutions help students understand how plants prepare food and how living organisms release energy from food. With the help of Selina Solutions for ICSE board, students can prepare important textbook questions, definitions, and scientific concepts related to chlorophyll, stomata, glucose, and respiration.

Find the Exercise-wise PDF of Selina Class 7 Biology Solutions chapter-4 Photosynthesis and Respiration.

What is Photosynthesis?

Photosynthesis is the process through which green plants prepare food using sunlight, carbon dioxide, water, and chlorophyll. Leaves are called the food factories of plants because this process mainly takes place in leaves.

Raw Materials Required for Photosynthesis

Sunlight

Sunlight provides the energy needed for food preparation.

Chlorophyll

Chlorophyll is the green pigment that traps sunlight energy.

Water

Roots absorb water from the soil and transport it to leaves through xylem tissues.

Carbon Dioxide

Carbon dioxide enters leaves through tiny openings called stomata.

Role of Stomata

Stomata are tiny pores present on leaf surfaces. They help in gaseous exchange and control water loss through transpiration. The opening and closing of stomata are controlled by guard cells.

Storage of Food in Plants

The food prepared during photosynthesis is stored in different plant parts such as roots, stems, fruits, leaves, and seeds. Examples include carrot, potato, and sugarcane.

What is Respiration?

Respiration is the process by which living organisms break down food to release energy. This energy is required for growth, movement, repair, and other life activities.

Difference Between Breathing and Respiration

Breathing is the movement of air into and out of the lungs, while respiration is a chemical process occurring inside cells. Students often study this difference carefully for examinations.

Types of Respiration

Aerobic Respiration

Aerobic respiration occurs in the presence of oxygen and releases a large amount of energy.

Anaerobic Respiration

Anaerobic respiration occurs without oxygen and releases less energy. Examples include yeast fermentation and muscle cramps during heavy exercise.

Importance of This Chapter

This chapter helps students understand the relationship between photosynthesis and respiration. Photosynthesis stores energy in food, while respiration releases that energy for life processes.

Benefits of Selina Solutions for Chapter 4

Selina solutions provide clear explanations for textbook exercises, diagrams, and scientific terms. Students can improve their understanding of photosynthesis, respiration, chlorophyll, and stomata through regular practice.