Ecology Worksheet - GCSE - Beginner

Ecology worksheet for GCSE (Key Stage 4 / GCSE (Ages 14-16)). Beginner level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Science•Key Stage 4 / GCSE (Ages 14-16)•Ecologybeginner

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Ecology in Action: GCSE Biology

Key Stage 4 (ages 14–16) • Beginner level • AQA-style

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Instructions: Work through the activities in order, using the information provided and your GCSE biology knowledge. Show calculations clearly, use precise ecological vocabulary and check that each answer addresses the command word.

Ecosystems and Feeding Relationships

Use the food web to identify organisms and explain how energy moves through an ecosystem. Arrows point from the food to the organism that eats it. Remember that a food chain begins with a producer.

Food web:

Grass → grasshopper → frog → fox

Grass → rabbit → fox

Oak leaves → caterpillar → bird → fox

1. Name one producer in this food web.

2. Identify one primary consumer.

3. Write a food chain from this web that contains four organisms.

4. Explain why the arrows point from the food to the consumer.

Energy Transfer and Population Data

Read the table carefully before answering. For the calculation, use the beginner-level rule that approximately 10% of energy at one trophic level is transferred to the next. Include the units in your answer.

Organism	Number recorded in one field	Feeding role
Grass plants	120	Producer
Rabbits	24	Primary consumer
Foxes	6	Secondary consumer

1. Which organism had the largest recorded population?

2. How many fewer rabbits than grass plants were recorded?

3. If producers contain 8,000 kJ of energy, estimate the energy transferred to primary consumers using the 10% rule.

4. Give one reason why less energy is available at each higher trophic level.

Adaptations for Survival

For each example, describe how the feature helps the organism survive in its habitat. Link the feature to a specific challenge, such as obtaining food, avoiding predators or conserving water.

1. A cactus has a thick stem that stores water and a waxy surface. Describe how these adaptations help it survive in a dry habitat.

2. A polar bear has thick fur and a layer of body fat. Explain how these features help it survive in a cold habitat.

3. A rabbit has eyes positioned on the sides of its head. Describe one survival advantage of this feature.

4. Explain how a pond plant with air spaces in its leaves may be adapted to living in water.

Biodiversity and Conservation

Biodiversity includes the variety of different species in an area. Compare the two sites using the data, then use your biological knowledge to explain why protecting biodiversity matters.

Site	Number of plant species	Number of animal species
Meadow A	12	18
Meadow B	5	9

1. Which meadow has the greater biodiversity according to these data?

2. How many more plant species were recorded in Meadow A than in Meadow B?

3. Describe one human activity that could reduce biodiversity in a meadow.

4. Explain one benefit of conserving biodiversity.

The Carbon Cycle

Use the word bank to complete each statement. Each word is used once. Then explain how one process moves carbon between organisms and the atmosphere.

Word bank: atmosphere, combustion, decomposition, photosynthesis, respiration

1. Plants take in carbon dioxide from the ___ during ___.

2. Carbon passes from plants to animals when animals feed; both plants and animals return carbon dioxide by ___.

3. Decomposers release carbon compounds as they break down dead organisms during ___.

4. Burning wood or fossil fuels releases carbon dioxide by ___.

5. Explain how feeding transfers carbon from a plant to an animal.

The Water Cycle and Ecosystem Links

Use the process descriptions and your knowledge of the water cycle. In your answers, distinguish evaporation from transpiration, and describe how water returns to the land and bodies of water.

1. Water changes from liquid in a lake to water vapour because of energy from the Sun. Name this process.

2. Water vapour leaves plant leaves through tiny openings. Name this process.

3. Explain how cooling water vapour forms clouds.

4. Describe how water can return from clouds to the ground.

5. Explain one way a change in rainfall could affect organisms in an ecosystem.

Answer Key

Activity 1: 1. Grass or oak tree (oak leaves are from the oak tree). ; 2. Grasshopper, rabbit or caterpillar. ; 3. Grass → grasshopper → frog → fox. ; 4. Arrows show the direction of energy transfer, from the organism being eaten to the organism that eats it.

Activity 2: 1. Grass plants. ; 2. 96. ; 3. 800 kJ. ; 4. Examples: energy is lost as heat through respiration; energy is used for movement; not all biomass is eaten or digested; energy is lost in waste.

Activity 3: 1. The thick stem stores water and the waxy surface reduces water loss, helping the cactus survive when water is scarce. ; 2. Fur and body fat provide insulation and reduce heat loss. ; 3. Gives a wider field of view to help detect predators. ; 4. Air spaces help the leaves float and allow gases to move through the plant.

Activity 4: 1. Meadow A. ; 2. 7 plant species. ; 3. Examples: ploughing or building on the meadow, pesticide use, or removing hedgerows. ; 4. Examples: maintains stable food webs; preserves genetic resources; supports ecosystem services such as pollination.

Activity 5: 1. atmosphere ; photosynthesis. ; 2. respiration. ; 3. decomposition. ; 4. combustion. ; 5. Carbon-containing molecules in plant biomass are passed to an animal when it eats the plant.

Activity 6: 1. Evaporation. ; 2. Transpiration. ; 3. Water vapour cools and condenses into tiny liquid droplets, forming clouds. ; 4. Precipitation, such as rain or snow. ; 5. Examples: less rainfall can reduce plant growth and water availability, affecting food and habitats; increased rainfall may flood habitats or alter species numbers.