NATIONAL 5 BIOLOGY - UNIT 3 EXAM
2025 QUESTIONS AND ANSWERS
Biodiversity - ANS The total variation within a region (rainforest,ocean,the Earth)
Abiotic - ANS Factors such as pH, Temperature, Soil Moisture, Rainfall and Light Intensity that
can affect a species
Biotic - ANS Factors such as Grazing, Predation, Food availability, Disease and competition
which can affect a species
Human Activities - ANS _______________ can also affect the biodiversity of a region. This
can involve altering the abiotic and biotic factors and can include Pollution (e.g. acid rain),
Habitat Destruction (e.g. deforestation) and over harvesting of an organism (e.g. overfishing)
Grazing - ANS When herbivores feed on plants
Low - ANS At low grazing levels the species diversity tends to be ____ as few dominant
species will prevent other species of plant from growing there
increase - ANS As grazing intensity increases the species diversity will __________ as the
dominant species are kept in check
decrease - ANS If grazing intensity gets too high the species diversity will ____________ due
to some species being wiped out
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, Predation - ANS When one organism hunts another and can affect many species within an
organism
Habitat - ANS Where an organism lives
Population - ANS All the members of one species living in a habitat
Community - ANS All the plants, animals and microorganisms living in a habitat
Species - ANS A group of organisms that can breed to produce fertile offspring
Biomes - ANS Geographical regions of the Earth that have similar climate
Fauna - ANS collective name for the animals in a particular environment
Flora - ANS general term for the plant life in a particular environment
Ecosystem - ANS A habitat in a region and all the living organisms that interact within it
___________ = HABITAT + COMMUNITY
Niche - ANS an organisms role it plays within an ecosystem
Competition - ANS When organisms require the same or similar resource(s) that are in short
supply
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2025 QUESTIONS AND ANSWERS
Biodiversity - ANS The total variation within a region (rainforest,ocean,the Earth)
Abiotic - ANS Factors such as pH, Temperature, Soil Moisture, Rainfall and Light Intensity that
can affect a species
Biotic - ANS Factors such as Grazing, Predation, Food availability, Disease and competition
which can affect a species
Human Activities - ANS _______________ can also affect the biodiversity of a region. This
can involve altering the abiotic and biotic factors and can include Pollution (e.g. acid rain),
Habitat Destruction (e.g. deforestation) and over harvesting of an organism (e.g. overfishing)
Grazing - ANS When herbivores feed on plants
Low - ANS At low grazing levels the species diversity tends to be ____ as few dominant
species will prevent other species of plant from growing there
increase - ANS As grazing intensity increases the species diversity will __________ as the
dominant species are kept in check
decrease - ANS If grazing intensity gets too high the species diversity will ____________ due
to some species being wiped out
COPYRIGHT © 2025 THESTAR ALL RIGHTS RESERVED 1
, Predation - ANS When one organism hunts another and can affect many species within an
organism
Habitat - ANS Where an organism lives
Population - ANS All the members of one species living in a habitat
Community - ANS All the plants, animals and microorganisms living in a habitat
Species - ANS A group of organisms that can breed to produce fertile offspring
Biomes - ANS Geographical regions of the Earth that have similar climate
Fauna - ANS collective name for the animals in a particular environment
Flora - ANS general term for the plant life in a particular environment
Ecosystem - ANS A habitat in a region and all the living organisms that interact within it
___________ = HABITAT + COMMUNITY
Niche - ANS an organisms role it plays within an ecosystem
Competition - ANS When organisms require the same or similar resource(s) that are in short
supply
COPYRIGHT © 2025 THESTAR ALL RIGHTS RESERVED 2
