What do the Grade 12 Biology cards cover?

15 cards across 5 chapters of the national textbook: Application of biology, Applications of Biology, Evolution, Control and Coordination and 1 more. You can take any chapter one card at a time on the page itself.

Do these help with the Grade 12 national exam?

Yes. Grade 12 sits a national exam, and these are the Biology rules and formulas it expects you to know. Past papers with a worked answer behind every question are on the same site, also free.

Where do these cards come from?

They are drafted from Grade 12 Biology, the Ministry of Education textbook for this grade. A second pass that cannot see the chapter then re-derives every formula, constant and table row, and anything it cannot confirm is held back instead of published.

Yes. Every card here is free to read and the printable sheet is free to download. Neither needs an account.

When was this last checked?

30 August 2026. Cards arrive chapter by chapter, and the line under each one says when that card was last read through.

Free short notes and revision cards

Grade 12 Biology

Grade 12 Biology on Temari has 15 revision cards, arranged by the chapters of the Ethiopian national curriculum. Every card says when the rule applies, what each symbol in it stands for, and the mistake students most often make with it. They are free to read and need no account.

15
Cards: 5
Chapters: 8
Reference tables: Grade 12 Biology
Textbook: Free
Price: 30 August 2026
Last checked

Everything15Reference table8Rule5Common mistake2

Application of biology

Classification of Natural ResourcesReference tableRenewable · Non-renewable

Resource Type	Definition	Examples
Renewable	Capable of being produced indefinitely and replaced when managed carefully	Sun, wind, water, geothermal, biomass, crops, livestock, timber
Non-renewable	Finite supplies that are not replaced at the speed they are used up	Metals (gold, iron, platinum), fossil fuels (coal, oil, natural gas)

When you use it

Use when distinguishing between infinite and finite environmental supplies in conservation biology questions.

Watch out

Renewable biological resources such as forests and wildlife can still be permanently lost through extinction if mismanaged.

Drafted from Grade 12 Biology, page 8 onwards, then checked twice before it went up

Confusing GMO with Transgenic OrganismsCommon mistake

When you use it

Use when identifying whether a genetically altered plant or animal contains foreign DNA from another species.

Watch out

Every transgenic organism is a GMO, but not every GMO is transgenic. An organism is only transgenic if the inserted recombinant DNA comes from a completely different species.

Drafted from Grade 12 Biology, page 8 onwards, then checked twice before it went up

Food Security versus Nutrition SecurityRule

When you use it

Use when explaining the distinct criteria that separate dietary calorie access from comprehensive health and nutritional sufficiency.

Watch out

Food security refers to physical and economic access to sufficient food, whereas nutrition security also requires clean water, sanitation, health care, and proper food utilization.

Drafted from Grade 12 Biology, page 8 onwards, then checked twice before it went up

Microorganisms in Food Production and BiotechnologyReference tableSpirulina · Methylophilus methylotrophus · Fusarium venenatum · +2

Microorganism	Type	Application or Product
Spirulina	Cyanobacterium	Single-cell protein source harvested from water surfaces
Methylophilus methylotrophus	Bacterium	Pruteen animal feed mass culture
Fusarium venenatum	Fungus	Mycoprotein meat substitute production
Streptococcus thermophilus and Lactobacillus bulgaricus	Bacteria	Yogurt fermentation
Saccharomyces	Fungus (yeast)	Fermentation of beer, wine, and distilled spirits

When you use it

Use when matching specific bacteria, cyanobacteria, or fungi to industrial and traditional fermented food products.

Watch out

Do not mix up the bacterial combinations for yogurt with those for acidophilus or Bulgarian milk.

Drafted from Grade 12 Biology, page 8 onwards, then checked twice before it went up

Applications of Biology

Food Security versus Nutrition SecurityRule

When you use it

Use this when explaining the difference between food security and nutrition security in biological applications.

Watch out

Food security focuses on access to sufficient and safe food, while nutrition security also demands adequate sanitation, healthcare, and sound childcare practices.

Drafted from Grade 12 Biology, page 7 onwards, then checked twice before it went up

Renewable versus Non Renewable Natural ResourcesRule

When you use it

Use this when classifying natural resources into renewable and non-renewable categories.

Watch out

Renewable biological resources can still be depleted permanently if harvested faster than their reproduction and growth lag time.

Drafted from Grade 12 Biology, page 7 onwards, then checked twice before it went up

Transgenic Organism DefinitionRule

When you use it

Use this rule when distinguishing a transgenic organism from a general genetically modified organism (GMO).

Watch out

All transgenic organisms are GMOs, but an organism is transgenic only if the introduced gene comes from a different species.

Drafted from Grade 12 Biology, page 7 onwards, then checked twice before it went up

Evolution

Allopatric vs Sympatric SpeciationReference tableAllopatric speciation · Sympatric speciation

Speciation Type	Primary Isolating Event	Geographic Status
Allopatric speciation	Physical geographic barrier separates populations	Geographically isolated
Sympatric speciation	Reproductive barrier develops within same habitat	Geographically overlapping

When you use it

Use when determining whether new species formed due to geographic separation or within the same territory.

Watch out

Sympatric speciation does not require physical barriers. It occurs via polyploidy or reproductive isolation in the same place.

Drafted from Grade 12 Biology, pages 188-218, then checked twice before it went up

Confusing Hybrid Sterility with Hybrid InviabilityCommon mistake

When you use it

Use when distinguishing postzygotic reproductive outcomes in evolutionary biology questions.

Watch out

In hybrid inviability the embryo dies before reproductive maturity, while in hybrid sterility the hybrid matures into an adult but cannot produce fertile gametes.

Drafted from Grade 12 Biology, pages 188-218, then checked twice before it went up

Patterns of EvolutionReference tableDivergent evolution · Convergent evolution · Parallel evolution

Pattern	Ancestry	Resulting Traits
Divergent evolution	Common ancestor	Homologous traits become increasingly different
Convergent evolution	Different ancestry	Analogous traits evolve due to similar environments
Parallel evolution	Related ancestry	Similar traits develop independently in similar niches

When you use it

Use when identifying whether shared traits in organisms arose from common descent or similar selection pressures.

Watch out

Convergent evolution produces analogous structures in unrelated species, not homologous structures from a common ancestor.

Drafted from Grade 12 Biology, pages 188-218, then checked twice before it went up

Reproductive Isolating MechanismsReference tableHabitat isolation · Temporal isolation · Behavioral isolation · +5

Barrier	Category	Mechanism
Habitat isolation	Prezygotic	Living in different ecological niches prevents mating
Temporal isolation	Prezygotic	Breeding at different times or seasons
Behavioral isolation	Prezygotic	Distinct courtship calls or mating rituals
Mechanical isolation	Prezygotic	Structural incompatibility of reproductive organs
Gametic isolation	Prezygotic	Sperm and egg chemically incompatible
Hybrid inviability	Postzygotic	Zygote fails to develop and dies in embryo stage
Hybrid sterility	Postzygotic	Offspring develops to adult but is infertile
Hybrid breakdown	Postzygotic	First generation fertile but subsequent generations weak

When you use it

Use to classify barriers that prevent interbreeding between different species before or after fertilization.

Watch out

Prezygotic barriers stop fertilization from occurring. Postzygotic barriers act only after a hybrid zygote has formed.

Drafted from Grade 12 Biology, pages 188-218, then checked twice before it went up

Types of Natural SelectionReference tableStabilizing selection · Directional selection · Disruptive selection

Selection Type	Phenotypic Effect	Population Impact
Stabilizing selection	Favors intermediate phenotypes	Reduces variation around the mean
Directional selection	Favors one extreme phenotype	Shifts the mean character value in one direction
Disruptive selection	Favors both extreme phenotypes	Splits population into two distinct peaks

When you use it

Use when analyzing how selective pressures change the distribution of phenotypes in a population.

Watch out

Disruptive selection selects against the average phenotype, not against the extremes.

Drafted from Grade 12 Biology, pages 188-218, then checked twice before it went up

Control and Coordination

Brain Regions and FunctionsReference tableCerebrum · Thalamus · Hypothalamus · +1

Brain Region	Major Functions
Cerebrum	Interpreting senses, speech, reasoning, emotions, learning, and fine motor control
Thalamus	Relay station for sensory tracts passing to the cerebrum
Hypothalamus	Homeostatic control of thirst, appetite, body temperature, and endocrine regulation
Brainstem	Relay station with crossing nerve tracts and reflex centers for sight, hearing, and touch

When you use it

Use this to recall the primary roles of different brain divisions in sensory processing, integration, and homeostasis.

Watch out

Nerve tracts cross in the brainstem, meaning the left hemisphere controls the right side of the body and vice versa.

Drafted from Grade 12 Biology, page 219 onwards, then checked twice before it went up

Meninges of the Central Nervous SystemReference tableDura mater · Arachnoid mater · Pia mater

Meningeal Layer	Position	Key Characteristics
Dura mater	Outermost	Tough, fibrous double layer, outer periosteal layer absent in spinal cord
Arachnoid mater	Middle	Delicate serous membrane, subarachnoid space beneath contains CSF
Pia mater	Innermost	Delicate vascular layer clinging tightly to the surface of the brain

When you use it

Use this when identifying the three protective membrane layers covering the brain and spinal cord from outermost to innermost.

Watch out

The periosteal layer of the dura mater is present in the skull but is absent around the spinal cord.

Drafted from Grade 12 Biology, page 219 onwards, then checked twice before it went up

Unit 6

Three Dimensions of Sustainable DevelopmentRule

When you use it

Use when identifying or describing the core pillars of sustainability according to the IUCN model.

Watch out

Sustainable development requires balancing all three overlapping dimensions: social equity, economic efficiency, and environmental preservation.

Drafted from Grade 12 Biology, page 11 onwards, then checked twice before it went up

The papers these formulas are for

Real national exam questions from past years, with a worked answer for each one.

Open the past papers

The same subject in other years

An exam paper keeps asking for what the year below taught. Those cards are here too.

Your other Grade 12 subjects

Everything else in this year that has cards so far.

Questions students ask

What do the Grade 12 Biology cards cover?: 15 cards across 5 chapters of the national textbook: Application of biology, Applications of Biology, Evolution, Control and Coordination and 1 more. You can take any chapter one card at a time on the page itself.
Do these help with the Grade 12 national exam?: Yes. Grade 12 sits a national exam, and these are the Biology rules and formulas it expects you to know. Past papers with a worked answer behind every question are on the same site, also free.
Where do these cards come from?: They are drafted from Grade 12 Biology, the Ministry of Education textbook for this grade. A second pass that cannot see the chapter then re-derives every formula, constant and table row, and anything it cannot confirm is held back instead of published.
Is this free?: Yes. Every card here is free to read and the printable sheet is free to download. Neither needs an account.
When was this last checked?: 30 August 2026. Cards arrive chapter by chapter, and the line under each one says when that card was last read through.

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