This video explains how the digestive system works in human beings and other animals
Introduction to CBSE Class 7 Science Chapter "Nutrition in Animals"
In the engaging chapter “Nutrition in Animals,” CBSE Class 7 Science students explore the varied dietary patterns across the animal kingdom and the digestive mechanisms that different animals use to convert food into energy. The chapter begins by defining nutrition and its importance for survival, growth, and maintenance of animals. It delves into different types of feeding habits such as herbivores, carnivores, omnivores, and parasites, highlighting the diversity of animal diets.
Students learn about the step-by-step process of digestion in humans, starting from ingestion and moving on to digestion, absorption, assimilation, and egestion. The functions of different digestive organs are explained, along with the roles of enzymes in the breakdown of food. The chapter also touches upon the concept of ruminants and their specialized stomachs, as well as the intriguing process of how small organisms like amoebas intake food.
Assignments for CBSE Class 7 Science Chapter “Nutrition in Animals”
- Digestive System Model: Create a model of the human digestive system and label the parts.
- Feeding Habit Diary: Keep a one-week diary of what you eat and categorize your meals as herbivore, carnivore, or omnivore habits.
- Enzyme Research: Research one digestive enzyme and present its function in the digestive process.
- Ruminant Report: Write a report on ruminants and how their digestive system is different from humans.
- Comparative Study: Compare and contrast the digestive process of an amoeba with that of a human.
Conclusion “Nutrition in Animals” is a comprehensive chapter that not only illuminates the process of animal nutrition but also emphasizes its crucial role in the sustenance and health of different species. By understanding these biological processes, students gain a deeper appreciation for the complexity of life and the various strategies animals employ to meet their nutritional needs.
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Questions and Answers for CBSE Class 7 Science Chapter "Nutrition in Animals"
- Q1: What is the importance of nutrition in animals? ANS: Nutrition is vital for animals to obtain energy, grow, repair tissues, and maintain their overall health and functions.
- Q2: How do carnivores obtain their nutrition? ANS: Carnivores obtain their nutrition by consuming other animals, which provides them with proteins and fats necessary for their diet.
- Q3: What are ruminants, and how is their digestion special? ANS: Ruminants are animals like cows and goats that have a specialized stomach with multiple chambers, enabling them to digest plant-based food more effectively by fermenting it before digestion.
- Q4: Why are enzymes important in digestion? ANS: Enzymes are crucial as they break down complex food substances into simpler forms that the body can absorb and use.
- Q5: How do organisms like amoebas consume food? ANS: Amoebas consume food by engulfing it with their cell membrane in a process called phagocytosis, creating a food vacuole where digestion occurs.
- Q6: Can you explain the process of egestion? ANS: Egestion is the process of removing undigested waste material from the body, which is the final step in the digestive process.
- Q7: How does the digestive system of an omnivore differ from a herbivore? ANS: The digestive system of an omnivore is adapted to digest both plant and animal materials, whereas a herbivore’s system is specialized to break down cellulose from plant materials.
- Q8: What role do teeth play in the process of digestion? ANS: Teeth play a critical role in mechanical digestion by breaking down food into smaller pieces, increasing the surface area for enzymes to act upon.
- Q9: What is the difference between absorption and assimilation? ANS: Absorption is the process by which nutrients pass through the digestive system into the bloodstream, whereas assimilation is when the absorbed food is taken up by the body cells and used for energy, growth, and repair.
- Q10: Why is it important for animals to have different types of feeding habits? ANS: Different feeding habits in animals promote ecological balance. Herbivores control plant growth, carnivores keep herbivore populations in check, and omnivores maintain both plant and animal species balance. This diversity ensures the survival of various species and contributes to the stability of ecosystems.
