CXC Integrated Science exam guide: Section A: Excretion

CXC Integrated Science exam guide: Excretion

CXC Integrated Science Exam Guide

Section A-The Organism

General objectives of the section:

Candidates should demonstrate an understanding of:


The interdependence of life processes;


The relationship between an organism and its environment;  

The relationship between structure and function of an organism;

Unit IV: Excretion

Specific Objectives

Students should be able to:

Explanatory notes
Suggested Practical Activities

1. Distinguish between excretion and ingestion

Excretion - definition necessary, (relationship to metabolism, excretory organs and products);

kidney - structure of tubule related to ultra-filtration (dialysis) and re-absorption; osmoregulation related to environmental factors;

plants - waste products, gaseous exchange and its importance, leaf fall/storage in bark.



2. Explain the mechanism of excretion by lungs, skin and kidneys;


Osmoregulatory function of kidneys; dialysis.

Examine diagrams/models of the skin and kidneys of man.

3. Identify the waste products of flowering plants and their methods of excretion.


Waste products of respiration and photosynthesis only



Go to Section A: unit VI: Coordination

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