✓ Revise Right course
Plants compete for light, space, water and mineral ions, while animals compete for food, mates and territory. Free notes and 13 questions answered.
Competition and Survival in Communities is part of Adaptations, interdependence and competition in GCSE AQA Higher Biology.
4 min
Reading time
36
Lessons in this topic
GCSE AQA Higher
Pathway
Reviewed by Revise Right
Content review
Plants compete for light, space, water and mineral ions, while animals compete for food, mates and territory. Free notes and 13 questions answered.
AQA GCSE Biology mock draft, 26–31 Oct. Draft coverage: Biology Paper 1 (Higher tier). Reviewed for an original-practice sitting; check student availability before registering. Marking and results will follow later, after separate approval. Eligible new accounts receive a five-day Pro trial when signup email verification completes. Previous trials keep their original expiry. After expiry, new papers need Pro unless you have an explicitly confirmed free sitting offer for this event. That offer adds no Pro time or AI learning. Saved attempts and released results remain readable. No card or automatic charge.
Use this lesson to stay inside Adaptations, interdependence and competition while connecting the detail back to the wider Ecology topic.
Read the core explanations from Competition and Survival in Communities before testing yourself from memory.
Picture a woodland in spring. Hundreds of bluebells are sprouting, but only some will flower. Squirrels are searching for nuts, but there aren't enough for everyone. This isn't random - it's competition, and it determines who lives, who dies, and who gets to reproduce.
Competition happens when organisms need the same resources but there isn't enough to go around. It's like a game of musical chairs - when the music stops, not everyone gets a seat.
Trap: Many students think competition only happens between different species. Actually, the fiercest competition is often between members of the same species because they need exactly the same resources.
Plants might look peaceful, but they're in constant competition. Think about a forest floor where seedlings are trying to grow. They're all fighting for the same four things.
Light is the big prize. Plants need it for photosynthesis, but tall trees cast shadows. That's why you see plants growing towards windows - they're literally reaching for the light.
Space matters too. Roots need room to spread, and leaves need space to catch sunlight without being shaded by neighbours. Ever noticed how plants in a crowded garden bed grow tall and spindly? They're competing for space above ground.
Water and mineral ions from the soil complete the list. Root systems spread out like underground networks, each trying to absorb as much as possible before their neighbours get there.
Animals have different needs, so they compete for different resources. Watch any nature documentary and you'll see these three competitions playing out.
Food is obvious - there's only so much prey to go around. Lions compete with hyenas for zebra carcasses. Garden birds compete for seeds at your bird feeder.
Mates drive some of the most dramatic competitions. Male peacocks show off their tail feathers, stags lock antlers, and male robins sing to claim territory and attract females.
Territory is about securing a safe space with resources. A robin's territory might contain enough insects to feed its chicks, plus safe nesting sites. Defend the territory, secure the resources.
Some organisms are better competitors than others. They have adaptations - special features that give them an edge in the struggle for resources.
Think about how different plants solve the light competition problem. Some grow tall quickly to overtop their neighbours. Others, like ivy, climb up trees to reach the canopy. Some, like bluebells, flower early in spring before the trees get their leaves and block the light.
Animals have equally clever solutions. Cheetahs are built for speed to catch prey that other predators can't. Owls hunt at night when there's less competition. Woodpeckers have strong beaks to access insects that other birds can't reach.
Worked example: Analysing Adaptations for Competition
A cactus lives in a desert where water is scarce and many plants compete for it. Describe three adaptations that help it compete successfully.
Answer: Widespread roots (collection), water storage in stem, spines reduce water loss
Let's see how competition plays out in real habitats. Understanding these examples will help you tackle any exam question about competition.
In a pond, different species of water plants compete for light. Those floating on the surface (like water lilies) block light from reaching plants below. The underwater plants that survive are adapted to low light conditions.
On the African savanna, lions and hyenas compete for the same prey. Lions are stronger and hunt in coordinated groups, but hyenas have powerful jaws and hunt in larger packs. Both species have evolved different strategies to compete for the same food source.
In your garden, weeds compete with your vegetables for nutrients, water, and space. That's why gardeners remove weeds - to reduce competition and help their crops grow better.
Competition questions appear regularly in GCSE exams. Here's how to tackle them and avoid the common traps that catch students out.
Command word alert: 'Suggest' questions about competition factors or adaptations can have multiple correct answers. Think about the organism's needs and environment.
Common mistake: Students often say animals compete for 'shelter' instead of being more specific. Better answers mention 'nesting sites', 'breeding territories', or 'safe places to raise young'.
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-20.
Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
A cactus has a widespread shallow root system to collect rainwater quickly, a thick, fleshy stem that stores water for dry periods, and spines instead of leaves to reduce water loss by transpiration. These adaptations help it compete for water in the desert.
Plants compete for light, space, water and mineral ions from the soil. Light is needed for photosynthesis but tall trees cast shadows, roots need room to spread, and root systems spread out to absorb as much water and mineral ions as possible.
Animals compete for food, mates and territory. Lions compete with hyenas for zebra carcasses, male peacocks show off their tail feathers and stags lock antlers to win mates, and robins defend territories containing enough insects and safe nesting sites.
Competition is the struggle between organisms for the same limited resources in a habitat, which happens when resources are not abundant enough for all organisms. The fiercest competition is often between members of the same species, because they need exactly the same resources.
Plants have different adaptations to compete for light: some grow tall quickly to overtop their neighbours, ivy climbs up trees to reach the canopy, and bluebells flower early in spring before the trees get their leaves and block the light.
Animals compete for territory to secure a safe space with resources. A robin's territory might contain enough insects to feed its chicks plus safe nesting sites, so defending it secures the resources needed to breed.
Animals compete for mates in dramatic ways: male peacocks show off their tail feathers, stags lock antlers, and male robins sing to claim territory and attract females.
Lions and hyenas compete for the same prey on the African savanna. Lions are stronger and hunt in coordinated groups, while hyenas have powerful jaws and hunt in larger packs, so both have evolved different strategies for the same food.
The fiercest competition is often between members of the same species, because they need exactly the same resources. Competition also happens between different species when they need the same limited resources.
Bluebells avoid competition for light by flowering early in spring, before the trees get their leaves and block the light. Other plants compete by growing tall quickly or, like ivy, climbing trees to reach the canopy.
Gardeners remove weeds because weeds compete with vegetables for nutrients, water and space. Removing them reduces competition and helps the crops grow better, just as plants in the wild compete for light and minerals.
Plants in a crowded garden bed grow tall and spindly because they are competing for space and light. Leaves need space to catch sunlight without being shaded by neighbours.
Saying animals compete for 'shelter' is too vague in an exam. Better answers name specific resources such as nesting sites, breeding territories or safe places to raise young.