TLE - Ex Situ

A Level Environmental Science revision

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Last updated: May 26, 2025

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First submitted	May 25, 2025
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Hint	Answer
CBR	Captive Breeding and Release
Ex-situ is required when...	In-situ is impossible or insufficient
CBR criteria	Is the population threatened?
CBR criteria	Is in-situ conservation being successful?
CBR criteria	Is there a genetically diverse captive population?
CBR criteria	Is keeping a captive population realistic?
CBR criteria	Is release likely to be successful?
Captive population difficulties	Enrichment
Captive population difficulties	Finances
Captive population difficulties	Food requirements
Captive population difficulties	Group dynamics
Captive population difficulties	Habitat size
Captive population difficulties	Interspecies relationships
Captive population difficulties	Stress
Importance of enrichment	Encourage species appropriate behaviour
Giraffe enrichment	Foraging
Difficult food requirements	Insectivorous bats
Difficult food requirements	Plankton-eating fish
Panda bamboo requirement	12-38kg
Importance of group dynamics	Reflect natural behaviours
Importance of habitat size	Animal size
Importance of habitat size	Instinct to roam
Orcas can travel...	100 miles /day
Tigers can occupy...	100km2
Difficult relationships (3)	Complicated, specific, symbiotic
The ____ ___ ________ overwinters in ___ ____	Alcon Blue Butterfly, ants nests
Since ____, most _______ _______ have died in their _____ or _______	1964, captive dolphins, teens, twenties
Threats to breeding	Breeding conditions
Threats to breeding	Breeding habitats
Threats to breeding	Hybridisation
Threats to breeding	Inbreeding
Threats to breeding	Species interactions
Importance of breeding conditions	Stimuli
Importance of breeding habitats	Courtship displays
Importance of breeding habitats	Social grouping
Importance of breeding habitats	Nesting
Method to help flamingos breed	Mirrors
Inbreeding can increase...	Harmful recessive genes

Hint	Answer
Inbreading can lead to...	Deformity
Inbreading can lead to...	Disability
There is no ______ ________ to weed out the ______ ________	Natural selection, weaker individuals
Methods of increasing breeding success	Artificial insemination
Methods of increasing breeding success	Cryopreservation
Methods of increasing breeding success	Embryo transfer
Methods of increasing breeding success	Micro-propagation
Methods of increasing breeding success	Somatic Cell Nuclear Transfer
Benefits of artificial insemination	Animals living far apart
Benefits of artificial insemination	Partners not accepting
Benefits of artificial insemination	Dangerous mating
Cryopreservation degradation	Dehydration
Cryopreservation degradation	Intracellular ice formation
Benefits of embryo transfer	Few breeding females
Benefits of embryo transfer	Long pregnancies
_______ _____ __________ carry for _____ __________	Common Eland Antelopes, Bongo Antelopes
Micro-propagation is a type of...	Tissue culture
____ is important for ______ ____ _____ as it can become ________ in the wild	SCNT Atlantic Black Poplar, hybridised
Types of release	Hard
Types of release	Soft
Types of post release support	Food provision
Types of post release support	Gradual release
______ ___ ______ often have parents born in ______ so they may not have ____ ______ _________	Captive born offspring, captivity, learnt natural behaviours
Habitat factors	Breeding sites
Habitat factors	Food and water supplies
Habitat factors	Legal protection
Habitat factors	Low predation
Habitat factors	Size
Post-release monitoring types	Auto-photography
Post-release monitoring types	Tagging
Post-release monitoring types	Tracking
Threats to released individuals	Recognising food
Threats to released individuals	Hunting
Threats to released individuals	Predation
Threats to released individuals	Social groups
Seed bank example +location	Millenium Seed Bank Sussex
Seed bank example +location	Global Seed Bank, Svalbard

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