Schooling · Class 7 · Science · Life Processes in Animals · Chapter on a page
CBSE Class 7 · Science · NCERT Curiosity
Life Processes in Animals: chapter on a page
A cut of Shishya's notes for this chapter: the first paragraph of the introduction and the key ideas, formulas and facts, common mistakes and quick revision lists, word for word. Nothing is added or reworded; the worked examples are left out (they are on the chapter page).
About the notes: Written by Shishya's AI on 26 Sept 2026 from the chapter's title and class level, in Shishya's own words — not a copy or summary of the textbook. Read the official chapter for the book's own text, activities and exercises.
This note's current text has no applied fact-check on record.
Mind map
Drawn from the same notes by a fixed rule (no AI): each label is the item's own words — its bold term, its label before a colon, a short formula as written, or its first words.
The mind map as a list
- Key ideas
- Nutrition
- Digestion
- Respiration
- Circulation
- Excretion
- Response to stimuli
- All life processes are connected.…
- Formulas and facts
- Alimentary canal
- Digestion in the mouth
- Stomach acids
- Small intestine
- Respiration equation (in words)
- Heart chambers
- Kidneys
- Watch out for
- Thinking respiration and breathing…
- Believing digestion happens only in…
- Confusing arteries and veins
- Thinking the heart is on the left…
- Believing plants do not respire
What this chapter is about
All living things carry out certain activities to stay alive. These activities are called life processes. Animals, including humans, must eat food, breathe air, remove waste, move, grow and respond to their surroundings. This chapter looks at how these processes happen inside an animal's body.
Key ideas
- Nutrition is the process of taking in food, breaking it down and using it for energy and growth. Animals are heterotrophs, meaning they cannot make their own food and must eat plants or other animals.
- Digestion breaks large food molecules into smaller ones that can be absorbed into the blood. In humans, this happens in the alimentary canal (mouth, food pipe, stomach, small intestine, large intestine).
- Respiration is the process of releasing energy from food. It needs oxygen and produces carbon dioxide and water as waste. Lungs help land animals breathe; gills help fish breathe underwater.
- Circulation is the movement of blood through the body. The heart pumps blood. Blood carries oxygen and digested food to all cells and brings back waste like carbon dioxide.
- Excretion is the removal of waste products made inside the body. The kidneys filter blood and produce urine. The lungs remove carbon dioxide. The skin removes some salts and water as sweat.
- Response to stimuli means reacting to changes in the environment. The nervous system (brain, spinal cord, nerves) and sense organs (eyes, ears, nose, tongue, skin) help animals detect and respond.
- All life processes are connected. Without digestion, the body has no energy. Without respiration, cells cannot use food. Without circulation, nutrients and oxygen cannot reach cells.
Formulas and facts to remember
- Alimentary canal: mouth → food pipe (oesophagus) → stomach → small intestine → large intestine → anus.
- Digestion in the mouth: saliva contains enzymes that start breaking down starch into sugar.
- Stomach acids: the stomach makes hydrochloric acid, which kills germs and helps digest proteins.
- Small intestine: most digestion and absorption happens here; finger-like villi increase the surface area.
- Respiration equation (in words): food (glucose) + oxygen → energy + carbon dioxide + water.
- Heart chambers: the human heart has four chambers — two atria (upper) and two ventricles (lower).
- Kidneys: two bean-shaped organs that filter blood and remove waste as urine.
- Sense organs and what they detect: eyes (light), ears (sound), nose (smell), tongue (taste), skin (touch, heat, pain).
Common mistakes
- Thinking respiration and breathing are the same thing → Breathing is inhaling and exhaling air; respiration is the process inside cells that releases energy from food.
- Believing digestion happens only in the stomach → Most digestion and absorption happen in the small intestine, not the stomach.
- Confusing arteries and veins → Arteries carry blood away from the heart; veins carry blood towards the heart.
- Thinking the heart is on the left side only → The heart is in the middle of the chest, tilted slightly to the left.
- Believing plants do not respire → All living things respire; plants respire day and night but photosynthesise only in light.
Quick revision
- Life processes keep an organism alive: nutrition, respiration, circulation, excretion, response to stimuli.
- Digestion turns food into simple, absorbable nutrients; the small intestine does most of this work.
- Respiration releases energy from food using oxygen; it happens in every cell.
- The heart pumps blood, which carries oxygen, nutrients and waste around the body.
- Kidneys filter blood and remove liquid waste as urine.
- The nervous system and sense organs help animals detect and respond to their surroundings.