This video lesson talks about respiration of respiration of living beings
Introduction to CBSE Class 7 Science Chapter "Respiration in Organisms"
The chapter “Respiration in Organisms” is an integral part of the CBSE Class 7 Science curriculum that delves into the life-sustaining process of respiration. It begins with the basic concept that respiration is not just about breathing but involves the complex process of cellular respiration where oxygen is used to break down glucose into carbon dioxide, water, and energy. This energy is vital for various functions and maintaining life.
Students learn about the different types of respiration, aerobic (with oxygen) and anaerobic (without oxygen), and how various organisms, including humans, plants, and animals, respire. The chapter also illustrates the human respiratory system, explaining the role of organs such as the nose, trachea, lungs, and diaphragm in the breathing process. Furthermore, the concept of how gaseous exchange occurs at the cellular level in different types of tissues is explored.
Experiments with lime water to show carbon dioxide release during respiration, and the importance of a healthy respiratory system are highlighted. The chapter aims to provide a thorough understanding of the respiration process, which is fundamental to all living organisms.
Assignments for CBSE Class 7 Science Chapter “Respiration in Organisms”
- Model Making: Construct a model of the human respiratory system and label the parts.
- Experiment Documentation: Perform the lime water experiment to show the presence of carbon dioxide in exhaled air and document the observations.
- Breathing Rate Activity: Calculate your breathing rate before and after a physical activity to understand the change in respiration with exertion.
- Research Assignment: Investigate and write a short report on how plants respire at night.
- Illustrative Charts: Create a chart that compares aerobic and anaerobic respiration and their products.
Conclusion The chapter “Respiration in Organisms” in CBSE Class 7 Science provides crucial insight into how respiration is central to life on Earth. It emphasizes the intricacies of the respiratory system and fosters an appreciation for the unseen, yet vital, processes that sustain life. Understanding respiration’s role equips students with the knowledge to make informed decisions about their health and the environment.
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Questions and Answers for CBSE Class 7 Science Chapter "Respiration in Organisms"
- Q1: What is respiration?
ANS: Respiration is a biological process where living organisms take in oxygen and use it to convert glucose into energy, carbon dioxide, and water. - Q2: How is breathing different from respiration?
ANS: Breathing is the physical process of taking air in and out of the lungs, whereas respiration includes the chemical processes at the cellular level. - Q3: What is aerobic respiration?
ANS: Aerobic respiration is the process of producing cellular energy with oxygen, resulting in carbon dioxide and water as by-products. - Q4: What happens during an aerobic respiration?
ANS: During anaerobic respiration, energy is produced without using oxygen, which results in by-products like lactic acid in muscles or alcohol and carbon dioxide in yeast.
- Q5: Describe the human respiratory system.
ANS: The human respiratory system includes the nasal passage, pharynx, larynx, trachea, bronchi, lungs, and diaphragm. These components work together to facilitate the exchange of oxygen and carbon dioxide. - Q6: Why do we need to respire?
ANS: Respiration is essential because it provides the energy necessary for all bodily functions and processes, by breaking down glucose molecules. - Q7: How do plants perform respiration?
ANS: Plants respire by taking in carbon dioxide and releasing oxygen during the day through photosynthesis, and they use oxygen while releasing carbon dioxide at night. - Q8: What is the role of the diaphragm in the respiratory system?
ANS: The diaphragm plays a crucial role by contracting and relaxing to allow the lungs to inhale and exhale air during breathing. - Q9: Can plants respire without photosynthesis?
ANS: Yes, plants can respire without photosynthesis, especially at night, when they take in oxygen and release carbon dioxide. - Q10: What is the significance of the lime water experiment in this chapter?
ANS: The lime water experiment demonstrates the presence of carbon dioxide in the exhaled air, which is a by-product of respiration, helping to visually show that respiration occurs in organisms.
