Class 7 Science - ICSE-BIOLOGY
Animal Life
The Chapter 'Animal Life' in Class 7 ICSE Biology explores the fascinating world of animals, focusing on their adaptation, nutrition, and physiological processes. Students will learn about holozoic nutrition in animals, which includes ingestion, digestion, absorption, assimilation, and egestion. The chapter also details the human digestive system, ruminant digestion in grass-eating animals, and feeding mechanisms in unicellular organisms like Amoeba. Mastering this chapter is crucial for board exams as it forms the fundamental base for understanding human physiology and animal biology in higher classes, frequently featuring in diagrams and conceptual questions.
Start Learning FreeKey Concepts
Holozoic Nutrition
A type of nutrition where animals take complex solid food into their bodies, break it down internally into simpler substances, and absorb them.
Digestion in Amoeba
Amoeba captures food using finger-like projections called pseudopodia, forming a food vacuole where digestive juices break down the food.
Human Digestive System
Comprises the alimentary canal and associated glands like the salivary glands, liver, and pancreas that work together to digest food and absorb nutrients.
Ruminant Digestion
A specialized digestive process in grass-eating animals that involves a four-chambered stomach and a special pouch called the rumen to digest cellulose.
Peristalsis
The wave-like muscular contraction of the alimentary canal walls that pushes food forward through the digestive tract.
Important Formulas
Board Exam Info
In ICSE Class 7 Biology, this chapter typically carries around 8 to 12 marks. Common question types include labeling diagrams of the human digestive system, differentiating between ruminants and non-ruminants, explaining the steps of nutrition, and short answers on specific digestive glands and their functions.
Frequently Asked Questions
Why can humans not digest cellulose while cows can?
Cows are ruminants that harbor special cellulose-digesting bacteria in their rumen, whereas the human digestive system lacks these bacteria and the necessary enzymes to break down cellulose.
What is the function of villi in the small intestine?
Villi are tiny, finger-like projections that increase the surface area of the small intestine to maximize the absorption of digested food into the blood.
What is the difference between ingestion and egestion?
Ingestion is the process of taking food into the body, while egestion is the removal of undigested waste matter from the body.
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