Class 10 Life Processes: How the Four Processes Connect
Instead of learning four disconnected definitions, follow a useful substance through the body. Food provides materials, respiration transfers usable energy, transport links tissues, and excretion removes metabolic waste.
Sources checked 2 October 2026 · original study guide · CBSE/NCERT context
Process guide · Read at your own pace
Follow the linked processes
These processes operate together. The map follows human transport of nutrients, gases and metabolic wastes; it is not an order in which four processes must happen. Cellular respiration occurs in cells, while breathing and gas exchange occur at respiratory surfaces.
Breathing is not the whole of respiration
Breathing moves air into and out of the lungs. Gas exchange transfers oxygen and carbon dioxide across respiratory surfaces. Cellular respiration is the chemical process within cells. The three are connected, but describing chest movement alone does not explain how a cell obtains energy.
Likewise, digestion breaks food into absorbable forms while absorption moves those products into the body’s transport system. When a question asks about the small intestine, identify which of these jobs its named adaptation supports.
Use a structure-to-function sentence
Swipe across the table to see all columns.
| Structure | Feature to notice | Job supported |
|---|---|---|
| Alveoli | Large surface area and thin exchange surface | Diffusion of gases |
| Small-intestine villi | Large surface area | Absorption of digested nutrients |
| Xylem | Conducting tissue | Transport of water and minerals |
| Phloem | Conducting tissue for soluble food | Translocation from sources to other tissues |
Trace a system without mixing its jobs
Human circulation has two linked routes: right side of the heart → lungs → left side of the heart, then left side → body tissues → right side. Blood passes through the heart twice in one complete circuit. Pulmonary arteries carry oxygen-poor blood towards the lungs; pulmonary veins carry oxygen-rich blood back. ‘Artery’ means away from the heart, not always oxygen-rich.
In the small intestine, digested nutrients are absorbed across a large surface provided by villi. In the kidneys, nephrons filter blood; useful substances and much water are reabsorbed, while urine carries wastes and excess substances through the ureters to the bladder. Undigested material leaving the gut is egestion, a different route.
For plants, water and minerals move through xylem from roots; soluble food moves in phloem from sources such as leaves to sinks such as growing or storage tissues. Do not label every plant transport arrow ‘up’: phloem movement follows source–sink relationships.
An explanation exercise without a question bank
Take the statement “exercise increases the demand for energy”. Expand it into a connected explanation using cells, oxygen supply and transport. Do not write that blood manufactures energy or that the lungs send energy directly to muscles.
For revision, draw arrows between the four process names and label what moves along each arrow. If every arrow is labelled only “helps”, replace it with a substance or a specific action. This reveals the missing links in an otherwise memorised answer.
Choose what to study next
Sources and scope
This is a focused learning resource, not a complete chapter or a prediction of board questions. Use your current syllabus and the paper-specific marking scheme for assessment requirements.
Frequently asked questions
Is removal of undigested food excretion?
It is egestion. Excretion removes metabolic wastes produced by the organism’s activities.
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