National 5 Biology - Unit 3 2025/2026
Exam Questions and Corresponding
Answers with Surety of 100% Pass Mark
Biodiversity - 🧠ANSWER ✔✔The total variation within a region
(rainforest,ocean,the Earth)
Abiotic - 🧠ANSWER ✔✔Factors such as pH, Temperature, Soil Moisture,
Rainfall and Light Intensity that can affect a species
Biotic - 🧠ANSWER ✔✔Factors such as Grazing, Predation, Food
availability, Disease and competition which can affect a species
Human Activities - 🧠ANSWER ✔✔_______________ 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 - 🧠ANSWER ✔✔When herbivores feed on plants
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
, Low - 🧠ANSWER ✔✔At low grazing levels the species diversity tends to be
____ as few dominant species will prevent other species of plant from
growing there
increase - 🧠ANSWER ✔✔As grazing intensity increases the species
diversity will __________ as the dominant species are kept in check
decrease - 🧠ANSWER ✔✔If grazing intensity gets too high the species
diversity will ____________ due to some species being wiped out
Predation - 🧠ANSWER ✔✔When one organism hunts another and can
affect many species within an organism
Habitat - 🧠ANSWER ✔✔Where an organism lives
Population - 🧠ANSWER ✔✔All the members of one species living in a
habitat
Community - 🧠ANSWER ✔✔All the plants, animals and microorganisms
living in a habitat
Species - 🧠ANSWER ✔✔A group of organisms that can breed to produce
fertile offspring
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
Exam Questions and Corresponding
Answers with Surety of 100% Pass Mark
Biodiversity - 🧠ANSWER ✔✔The total variation within a region
(rainforest,ocean,the Earth)
Abiotic - 🧠ANSWER ✔✔Factors such as pH, Temperature, Soil Moisture,
Rainfall and Light Intensity that can affect a species
Biotic - 🧠ANSWER ✔✔Factors such as Grazing, Predation, Food
availability, Disease and competition which can affect a species
Human Activities - 🧠ANSWER ✔✔_______________ 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 - 🧠ANSWER ✔✔When herbivores feed on plants
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
, Low - 🧠ANSWER ✔✔At low grazing levels the species diversity tends to be
____ as few dominant species will prevent other species of plant from
growing there
increase - 🧠ANSWER ✔✔As grazing intensity increases the species
diversity will __________ as the dominant species are kept in check
decrease - 🧠ANSWER ✔✔If grazing intensity gets too high the species
diversity will ____________ due to some species being wiped out
Predation - 🧠ANSWER ✔✔When one organism hunts another and can
affect many species within an organism
Habitat - 🧠ANSWER ✔✔Where an organism lives
Population - 🧠ANSWER ✔✔All the members of one species living in a
habitat
Community - 🧠ANSWER ✔✔All the plants, animals and microorganisms
living in a habitat
Species - 🧠ANSWER ✔✔A group of organisms that can breed to produce
fertile offspring
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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