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_Biology Paper 2 A+levelRevision
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Biology Paper 2 A+levelRevisionhttps://www.physicsandmathstutor.com/biology-revision/a-level-aqa/genetics-population
s-evolution-ecosystems/ - ANS-revise this
Role of producers in an ecosystem - ANS-Perform photosynthesis and produce sugar
and oxygen
It also regulates carbon
Role of consumers in an ecosystem - ANS-animals, eat plants or other consumers
Role of decomposers/saprobionts - ANS-- release enzyme onto dead plants/dead
animals/animal
waste (organic matter)
- breaking them down to obtain
biological molecules
How do organisms get the energy they need? - ANS-by breaking down food molecules
gradually and capturing their chemical energy
Main Source = Glucose
Stored as Starch in plants and Glycogen in animals
How does energy move through an ecosystem? - ANS-Energy moves through an
ecosystem when one organism eats another in the trophic level.
EXAM QUESTION: PHOTOSYNTHESIS
Heat stress decreases the light-dependent reaction of photosynthesis. Explain why
this leads to a decrease in the light-independent reaction. - ANS-1. No ATP;
2. No reduced NADP;
A decrease in the activity of the enzyme rubisco would limit the rate of photosynthesis.
Explain why. - ANS-1. Less carbon dioxide reacts with RuBP;
2. Less GP;
Where precisely is rubisco found in a cell? - ANS-Stroma of a cholorplast
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