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Grade 9 Rationalized Integrated Science Notes on Living Things and Their Environment: Strand 2

Institution: Junior Secondary

Course: Integrated Science

Content Category: grade 9 notes

Posted By: raphael

Document Type: PDF

Number of Pages: 32

Price: KES 80

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Summary

Enhance your Grade 9 science knowledge with comprehensive notes on Living Things and Their Environment: Strand 2.

STRAND 2: LIVING THINGS AND THEIR ENVIRONMENT
NUTRITION IN PLANTS
Introduction
? Nutrition refers to the process by which living organisms obtain and assimilate
(utilize) nutrients.
? It is one of the fundamental characteristics of living things.
? The nutrients obtained are useful to the living organisms in many ways:
- The nutrients are required for growth and development of the living organisms.
- The nutrients are required for energy provision as they are broken down to
release energy.
- The nutrients are also required for repair of worn out tissues
- Nutrients are required for synthesis of very vital macromolecules in the body
such as hormones and enzymes.
Modes of Nutrition
There are two main nutrition modes:
1. Autotrophism: mode of nutrition through which living organisms
manufacture their own food from simple inorganic substances in the environment such
as carbon (IV) oxide, water and mineral ions. Organisms that make their own food
through this mode are autotrophs.
2. Heterotrophism: mode of nutrition in which living organisms depend on
already manufactured food materials from other living organisms. Heterotrophs are the
organisms that feed on already manufactured food materials.

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