NCERT Solutions Class 7 Science Chapter 9 Life Processes in Animals

The study of life processes lies at the heart of understanding how living organisms sustain themselves. In Class 7 Science – Chapter 9: Life Processes in Animals, the NCERT Solutions delves into the essential functions that enable animals to grow, reproduce, and interact with their environment. You'll explore how animals eat, breathe, transport materials, and eliminate waste—mechanisms crucial for survival.

This NCERT Solutions Class 7 Science chapter builds upon foundational concepts learned in earlier grades, linking the intricate systems within animal bodies to everyday phenomena—like digestion, breathing, and blood circulation. Through detailed explanations, illustrative diagrams, and hands-on activities, learners gain clarity on how nature’s machinery operates inside us.

1.0NCERT Solutions Class 7 Science Chapter 9 Life Processes in Animals - Download PDF

Access the NCERT Solutions for Class 7 Science Chapter 9 PDF – Life Processes in Animals, which includes step-by-step answers to all in-text and exercise questions drawn directly from the updated Curiosity. 

2.0Key Concepts in Chapter 9: Life Processes in Animals

A deep dive into the chapter reveals four major topics:

1. Nutrition in Animals 

Animals obtain food in varied ways—herbivores grazing, carnivores hunting, omnivores eating both plants and animals, and filter feeders like sponges and whales . The nutrition section traces the journey of food:

• Ingestion: Food enters through the mouth
• Digestion: Mechanical (chewing) and chemical (saliva) breakdown
• Alimentary canal: Organs include oesophagus, stomach, small & large intestines, anus Absorption: Nutrients move into blood via the small intestine
• Egestion: Unusable waste expelled from the body

Special cases, like ruminants chewing cud (e.g., cows) and the enzymatic tests using iodine and saliva, are explained with practical examples .

2. Respiration

NCERT describes respiration as the process of breaking down food with oxygen for energy. This includes:

• External respiration – intake of oxygen and exhalation of carbon dioxide using lungs (or gills in aquatic animals) 
• Cellular respiration – breakdown of glucose inside cells releasing energy, water, and CO₂ .

The diaphragm's role in breathing, and the differences in respiration across animal groups, are also covered.

3. Transportation

Though primarily focused on nutrition and respiration, the chapter briefly mentions how animals like humans transport food, oxygen, and wastes via blood and lymph systems. The heart pumps blood throughout the body’s channels, feeding every cell.

4. Excretion

Animals must eliminate metabolic wastes—like CO₂, water, salts, and urea—to maintain balance. This section explains:

• Removal of CO₂ via lungs, water and salts via sweat and kidneys
• The role of kidneys and skin in excretory functions

Though less extensively detailed in this chapter, excretion is framed as one of the essential life processes.

3.0Key Features of NCERT Solutions Class 7 Science Chapter 9

1. Conceptual Clarity
   Explanations follow a logical structure, mirroring the NCERT sequence—starting from basic definitions (e.g., what is life?) to complex processes (like cellular respiration).
2. Labeled Diagrams
   The mouth and alimentary canal, lung structure, and the breathing model (diaphragm/pet bottle demo) are clearly illustrated with step labels 
3. Step-by-Step Solutions
   Students are guided through multi-step experiments, reasoning questions, and application-based scenarios (e.g., why cows chew cud, lime-water tests for CO₂).
4. Activity-Based Learning
   Hands-on activities—like salivary starch breakdown, modeling inhalation/exhalation using rubber-sheet diaphragms, and lime-water experiments—help reinforce theoretical concepts through observation 
5. Differentiated Responses
   Questions consider diverse organisms—humans, ruminants, fishes, amphibians—highlighting how life processes adapt to habitat and physiology.
6. Text-Backed Answers
   All solutions strictly reference NCERT content, ensuring no extra, irrelevant material—perfect for CBSE-aligned preparation.