Class 7 Science - WEST-BENGAL
Life Processes in Animals
The chapter 'Life Processes in Animals' for Class 7 West Bengal Board (WBBSE) students explores the fundamental biological activities that keep animals alive. It covers essential processes like nutrition, respiration, transportation of substances, and excretion in various animals. Students will learn how single-celled animals like Amoeba feed and how complex organisms, including humans, digest food, breathe, circulate blood, and remove waste. Understanding these internal systems is crucial for board exams as it forms the foundation of human anatomy and physiology, frequently appearing in both short answer and diagram-based questions.
Start Learning FreeKey Concepts
Nutrition in Animals
The process of taking in food and utilizing it for energy, growth, and repair, which involves ingestion, digestion, absorption, assimilation, and egestion.
Human Digestive System
A complex tube-like passage consisting of the alimentary canal and digestive glands that breaks down complex food substances into simpler, absorbable forms.
Respiration
The process of releasing energy from digested food using oxygen, which takes place through different organs like lungs in mammals, gills in fish, and skin in earthworms.
Circulatory System
The transport system in animals, comprising the heart, blood vessels, and blood, responsible for carrying oxygen, nutrients, and waste products throughout the body.
Excretion
The biological process of removing toxic metabolic waste products, such as urea and carbon dioxide, from the animal body to maintain internal balance.
Important Formulas
Board Exam Info
In the West Bengal Board (WBBSE) Class 7 Science examinations, this chapter typically carries around 8 to 12 marks. Questions usually include multiple-choice questions (MCQs), short answer questions, matching columns, and important diagram-based questions such as labeling the human digestive system or the heart.
Frequently Asked Questions
What is the difference between breathing and respiration?
Breathing is just the physical process of taking in oxygen and giving out carbon dioxide. Respiration is a chemical process that includes breathing and the breakdown of food inside cells to release energy.
How does Amoeba digest its food since it has no mouth?
Amoeba captures food using finger-like projections called pseudopodia. It engulfs the food to form a food vacuole, where digestive juices break it down.
Why is blood red in color?
Blood contains a red-colored pigment called hemoglobin present in the red blood cells, which binds with oxygen and transports it to all parts of the body.
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