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ScotlandBiology

Area 3: Life on Earth

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How is the distribution of organisms affected by their environment, and how is it measured?

The effect of abiotic and biotic factors on the distribution of organisms, the use of indicator species to judge environmental conditions, and sampling techniques such as quadrats and pitfall traps with their sources of error.
An SQA National 5 Biology answer on the distribution of organisms, covering the effect of abiotic and biotic factors on distribution, the use of indicator species to judge environmental conditions, and sampling techniques such as quadrats and pitfall traps with their sources of error.
9 min answer →

How do organisms interact in an ecosystem, and what is meant by biodiversity, niche and competition?

Ecosystems as communities of organisms with their abiotic environment, the meaning of biodiversity and niche, the biotic and abiotic factors that affect organisms, and competition within and between species.
An SQA National 5 Biology answer on ecosystems, covering ecosystems as communities of organisms with their abiotic environment, the meaning of biodiversity and niche, the biotic and abiotic factors that affect organisms, and competition within and between species.
9 min answer →

How does energy flow through food chains, and why are food chains short?

Food chains and food webs and the flow of energy from producers through consumers, pyramids of numbers and of energy, and the loss of energy at each level that limits the length of food chains.
An SQA National 5 Biology answer on energy in ecosystems, covering food chains and food webs and the flow of energy from producers through consumers, pyramids of numbers and of energy, and the loss of energy at each level that limits the length of food chains.
9 min answer →

How do mutation, variation and natural selection lead to the evolution of new species?

Mutation as the source of new alleles, variation and natural selection, and speciation through isolation by geographical, ecological or behavioural barriers followed by independent mutation and selection.
An SQA National 5 Biology answer on the evolution of species, covering mutation as the source of new alleles, variation and natural selection, and speciation through isolation by geographical, ecological or behavioural barriers followed by independent mutation and selection.
9 min answer →

How do we produce enough food while managing the effects of fertilisers and pesticides?

Food security and the need to increase food production, the use of fertilisers and the problem of algal blooms, the use of pesticides and bioaccumulation, and the alternatives of biological control and GM crops.
An SQA National 5 Biology answer on food production, covering food security and the need to increase food production, the use of fertilisers and the problem of algal blooms, the use of pesticides and bioaccumulation, and the alternatives of biological control and GM crops.
9 min answer →

How do plants capture light energy and use it to make sugar?

The word equation for photosynthesis, the two stages of the light reactions and carbon fixation, the uses of the sugar made, and the limiting factors that control the rate of photosynthesis.
An SQA National 5 Biology answer on photosynthesis, covering the word equation, the two stages of the light reactions and carbon fixation, the uses of the sugar made, and the limiting factors that control the rate of photosynthesis.
9 min answer →