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🇬🇧 Scottish National 4 (Nat 4) · flashcards
Scottish National 4 (Nat 4) Biology (National 4) Flashcards
50 question-and-answer cards covering Biology (National 4) as it is examined in Scottish National 4 (Nat 4). 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Biology (National 4) deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
List the levels of organisation in a multicellular organism, from smallest to largest.
Cells → tissues → organs → organ systems → organism.
Define a tissue.
A group of similar cells that work together to perform a particular function (e.g. muscle tissue).
Define an organ.
A group of different tissues working together to carry out a specific function (e.g. the heart).
What are the male and female gametes (sex cells) in animals?
The male gamete is the sperm; the female gamete is the egg (ovum).
What is fertilisation?
The fusion (joining) of the nucleus of a male gamete with the nucleus of a female gamete to form a zygote.
What are the male and female gametes in a flowering plant, and where are they found?
Male gamete: pollen (made in the anther). Female gamete: ovule/egg (found in the ovary).
Name the main organs of the human digestive system in order.
Mouth → oesophagus → stomach → small intestine → large intestine.
What is the role of the lungs in the respiratory system?
Gas exchange — oxygen diffuses into the blood and carbon dioxide diffuses out, at the alveoli.
Name the three main blood vessels and one feature of each.
Arteries (carry blood away from the heart, thick walls, high pressure); veins (carry blood to the heart, have valves); capillaries (thin walls for exchange of materials).
What is the nervous system's role in control and communication?
It detects stimuli and sends rapid electrical messages (impulses) along neurons to coordinate fast responses.
Describe the reflex arc pathway.
Stimulus → receptor → sensory neuron → relay neuron (in CNS) → motor neuron → effector → response.
What are the two parts of the central nervous system (CNS)?
The brain and the spinal cord.
How does hormonal (endocrine) control differ from nervous control?
Hormones are chemical messengers carried in the blood — slower but longer-lasting; nervous control uses electrical impulses — fast and short-lived.
What hormone controls blood sugar level, and which organ releases it?
Insulin, released by the pancreas, lowers blood sugar level.
Define an ecosystem.
All the living organisms (community) in a particular area together with the non-living (abiotic) factors of their environment, interacting together.
Define biodiversity.
The variety of different species of living organisms in an ecosystem (or on Earth).
What is a food chain and what does the direction of the arrows represent?
A diagram showing the feeding relationships between organisms; the arrows show the direction of energy flow (from prey to predator).
Define a producer and a consumer.
A producer (e.g. green plant) makes its own food by photosynthesis; a consumer is an organism that gets energy by eating other organisms.
What is an adaptation?
A feature or characteristic of an organism that makes it better suited (adapted) to survive in its environment.
Explain the basic process of natural selection.
Variation exists in a population; those with adaptations best suited to the environment are more likely to survive, reproduce and pass on their favourable characteristics to offspring ('survival of the fittest').
Give two examples of human activities that negatively impact the environment.
Burning fossil fuels (air pollution / increased CO2), deforestation, overuse of fertilisers, and dumping of waste/chemicals — any two.
What is an indicator species and what does it indicate?
A species whose presence or absence indicates the level of pollution (environmental quality) in an area, e.g. lichens indicate clean air.
In designing an investigation, what is the difference between the independent and dependent variable?
The independent variable is the one you deliberately change; the dependent variable is the one you measure as a result.
Why is it important to repeat an experiment and identify variables to keep constant?
Repeating and averaging results makes the data more reliable, and keeping all other variables constant makes the experiment a fair test so the results are valid.
What this deck covers
The Biology (National 4) deck follows the Scottish National 4 (Nat 4) Biology (National 4) syllabus — 4 chapters and 14 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 12.5 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 111 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Biology (National 4) flashcards FAQ
How many Biology (National 4) flashcards are in this Scottish National 4 (Nat 4) deck?
50 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these Scottish National 4 (Nat 4) flashcards free?
Yes. The preview here is free to read with no signup, and the full 50-card deck is free inside the Examius app.
What do the Biology (National 4) cards cover?
They follow the Scottish National 4 (Nat 4) Biology (National 4) syllabus — 4 chapters and 14 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.