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Slide 1

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Ecosystems and
By Daniella Di-Fonzo…read more

Slide 2

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· (a) define the term ecosystem;
· (b) state that ecosystems are dynamic systems;
· (c) define the terms biotic factor and abiotic factor, using named examples;
· (d) define the terms producer, consumer decomposer and trophic level;
· (e) describe how energy is transferred though ecosystems;
· (f) outline how energy transfers between trophic levels can be measured;
· (g) discuss the efficiency of energy transfers between trophic levels;
· (h) explain how human activities can manipulate the flow of energy through ecosystems (HSW6b);
· (i) describe one example of primary succession resulting in a climax community;
· (j) describe how the distribution and abundance of organisms can be measured, using line transects, belt transects, quadrats and
point quadrats (HSW3);
· (k) describe the role of decomposers in the decomposition of organic material;
· (l) describe how microorganisms recycle nitrogen within ecosystems. (Only Nitrosomonas, Nitrobacter and Rhizobium need to be
identified by name).…read more

Slide 3

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What is an ecosystem?
· Any group of living organisms and non- living
things occurring together, and the
interrelationships between them, can be
thought of as an ecosystem
· Ecosystems are dynamic because they're
changing all the time e.g., populations of
different species…read more

Slide 4

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Biotic and Abiotic factors
Biotic Abiotic
Feeding of herbivores on plants e.g.,
e.g., lions Non-living factors
Predation temperature
predate such as temperature,
Parasitism- a parasite does harm to the host affects
zebras oxygen concentration
Mutualism- two organisms have a relationship metabolic
for food. beneficial to them both and light intensity processes…read more

Slide 5

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Producer: an organism that produces
organic molecules using sunlight, e.g.,
Consumer: An organism that eats other
organisms e.g., herbivore/ carnivore
Decomposer: An organism that breaks
down dead or undigested organic
material, e.g., bacteria and fungi
Trophic level: A stage in the food chain
occupied by a particular group of
organisms e.g., producers are the first
trophic level in a food chain…read more

Slide 6

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1. Energy enters an ecosystem, mainly, when plants
photosynthesise. How energy is transferred
2. During photosynthesis, plants convert sunlight though ecosystems
energy into carbohydrates, proteins and fats
3. energy is transferred when one organism eats
4. Food chains, pyramids and webs show how energy
is transferred through an ecosystem
5. Energy in things that can't be eaten, e.g., faeces
are recycled back into the ecosystem by
decomposers…read more

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Lovely presentation, has to be the best in terms of looks and content thank youuu :)

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