National 5 Biology- Life on Earth Test Revision Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

National 5 Biology- Life on Earth Test Revision Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What term describes the role an organism plays within its ecosystem? Niche What process allows plants to convert light energy into chemical energy? Photosynthesis What gas is taken in by plants during photosynthesis? Carbon dioxide What is the main source of energy for most ecosystems? Sunlight What is the name given to organisms that make their own food using sunlight? Producers 2 What type of consumer feeds only on plants? Herbivore Which term describes the total number of different species in an ecosystem? Biodiversity What is a feeding relationship that shows a single path of energy flow? Food chain What type of organism breaks down dead material and returns nutrients to the soil? Decomposer What term is used when one species outcompetes another for resources? Competition What is the first organism in any food chain? Producer 3 What part of the plant absorbs light for photosynthesis? Leaf What are the three essential elements for healthy plant growth often found in fertilisers? Nitrogen, phosphorus, potassium What human activity can reduce biodiversity in a rainforest? Deforestation What is the term for a species that no longer exists? Extinct What adaptation might a desert plant have to survive dry conditions? Thick waxy leaves to reduce water loss What happens to energy as it moves from one level of a food chain to the next? It decreases