SS3 First Term Biology Lesson Note – Balance in Nature

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FIRST TERM: E-LEARNING NOTES

SUBJECT: BIOLOGY                                                 

CLASS:   SS 3

WEEK 1: REVISION OF SUMMER SCHOOL’S WORK

WEEK 2

TOPIC: BALANCE IN NATURE

CONENT:

1. Factors affecting a population
2. Dynamic population
3. Family planning

SUB-TOPIC ONE: FACTORS AFFECTING A POPULATION

In ecology, the interaction between plant and animals in an environment produces a stable and a balance system. A population is referred to as stable if the population size remains relatively constant.

There are many factors that contribute to the balance in nature; these factors are either abiotic or biotic

Abiotic factors these factors are:

• Availability of space
• Light
• Heat
• Oxygen (air)
• Water
• Food

Biotic factors: these factors are

• Predation
• Competition
• Parasitism
• Diseases
• Natality
• Mortality
• Territorial behaviour
• Dispersal

EVALUATION

1. List five factors (abiotic) that contribute to the balance in nature
2. List five factors (biotic) that contribute to the balance in nature.

SUB-TOPIC 2: DYNAMIC EQUILIBRIUM

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