ICSE Selina Class 10 Biology Solutions Chapter-5 – Transpiration
Understanding transpiration is essential for mastering plant physiology in Class 10 Biology. ICSE Selina Class 10 Biology Solutions Chapter-5 explains how plants lose water in the form of water vapour and why this process is necessary for their survival. Students searching for ICSE Selina Class 10 Solutions often find this chapter important because it combines theory, experiments, and practical applications related to water movement in plants. The chapter helps learners understand how transpiration influences absorption, transportation of minerals, cooling of plants, and overall plant growth. A thorough understanding of the concepts covered in this chapter can help students perform better in examinations and strengthen their knowledge of plant life processes.
Find the PDF of All Exercises of ICSE Selina Class 10 Biology Solutions Chapter-5 – Transpiration
Students often look for chapter-wise exercise PDFs to revise important questions before examinations. The exercise section of this chapter covers definitions, factors affecting transpiration, experiments demonstrating transpiration, and the significance of the process. Solving all textbook questions helps students gain confidence in answering objective, short-answer, and long-answer questions. Regular practice also improves conceptual clarity and ensures that students can explain scientific terms accurately in examinations.
Understanding the Process of Transpiration
Transpiration is the loss of water from the aerial parts of plants, mainly through tiny pores called stomata. A small amount of water is also lost through the cuticle and lenticels. This chapter explains how water absorbed by roots travels upward through the xylem and eventually escapes into the atmosphere as water vapour.
The process may appear simple, but it plays a vital role in maintaining the plant’s internal balance. As water evaporates from leaves, it creates a pull that helps transport water and dissolved minerals from roots to different parts of the plant. This mechanism is known as transpiration pull and is one of the most important concepts discussed in the chapter.
Students should pay special attention to diagrams showing stomatal structure and the pathway of water movement, as these are frequently included in examination questions.
Factors Affecting Transpiration Rate
One of the most important sections of this chapter focuses on factors that influence the rate of transpiration. Environmental conditions such as temperature, humidity, wind velocity, and light intensity directly affect water loss from plants.
Higher temperatures generally increase transpiration because evaporation occurs more rapidly. On the other hand, high humidity reduces transpiration since the surrounding air already contains a large amount of moisture. Wind increases the rate of water loss by removing moist air around the leaf surface, while bright sunlight causes stomata to open wider, resulting in increased transpiration. The chapter also discusses internal plant factors such as leaf surface area, number of stomata, and thickness of the cuticle. Understanding these factors helps students explain variations in transpiration among different plant species and environmental conditions.
Importance of Transpiration and Common Experiments
Transpiration is not merely a process of water loss; it performs several important functions in plants. It helps maintain a continuous flow of water and minerals from roots to leaves, regulates temperature through cooling, and supports cell turgidity. Without transpiration, plants would struggle to transport essential nutrients effectively.
The chapter includes experiments that demonstrate transpiration using potted plants and cobalt chloride paper. These practical activities help students observe the process directly and understand how scientists measure water loss in plants. Examination questions often focus on these experiments, including their observations, procedures, and conclusions. Students should also understand the advantages and disadvantages of transpiration. While it helps in cooling and nutrient transport, excessive transpiration can lead to wilting if water loss exceeds water absorption.