What do plants need to photosynthesise quickly and therefore what is a limiting factor?
Light, warmth and carbon dioxide - a limiting factor is any one of these in short supply
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How does the rate of photosynthesis change as temperature increases and why?
As temperature rises, the reactions are quicker so the rate is quicker, until (for most plants) it reaches 50degreesC when the enzymes controlling it are denatured and the rate falls
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When are carbon dioxide levels around a plant highest and why?
At night - plants respire but don't photosynthesise
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Why do plants and algae need a constant supply of glucose?
For respiration
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What is the energy from respiration used for?
Cell functions e.g. growth and repair
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What are 2 molecules plants that a plant can make out of glucose? What are their functions?
Starch (insoluble in water, used for storage) and cellulose (strengthens cell walls)
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How do plants make amino acids and what are they used for?
By combining sugars with nitrate (& other mineral) ions - used to make proteins
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What else can plants and algae make with glucose? Why are these stored in seeds?
Fats and oils - stored in seeds to provide lots of energy for the new plant as it germinates
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How is food moved around the plant?
In the phloem
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Why can't plant cells store their food as glucose?
It's soluble in water (could affect the way it moves in and out of cells)
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Where is starch stored in plants?
In cells, tubers (e.g. potatoes) and bulbs (e.g. onions)
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What is hydroponics?
Growing plants in water with mineral ions
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Where is temperature always a limiting factor?
In cold climates (e.g. arctic plants are small)
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How might a plant be adapted to survive in areas with low light?
More chlorophyll/bigger leaves
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What affects the breeding cycles of many animals and plants?
Day length
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What happens when it rains in the desert?
Lots of plants grow, flower and set seeds quickly, then are eaten by animals
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What do fish require to live in a particular area?
The right level of dissolved oxygen (e.g. invertebrates can survive in areas of low oxygen)
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What is a quadrat and what are they used to measure?
Square frames used to outline your sample area, often used to measure the size of a population of plants
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What is quantitative sampling?
The mean number of organisms per metre squared, from a number of random readings
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What are the mean, median and mode?
Mean - add results up & divide by number of readings; Median - middle value when results are put in order; Mode - the most frequently occurring value
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What is a transect?
A line used for measuring the distribution of organisms
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What does reproducible mean?
Other people can do the same thing and get identical/similar results
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What does valid mean?
Your results answer the question asked
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Why do we need control variables?
They increase the likelihood of reproducibility
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Other cards in this set
Card 2
Front
How does the rate of photosynthesis change as temperature increases and why?
Back
As temperature rises, the reactions are quicker so the rate is quicker, until (for most plants) it reaches 50degreesC when the enzymes controlling it are denatured and the rate falls
Card 3
Front
When are carbon dioxide levels around a plant highest and why?
Back
Card 4
Front
Why do plants and algae need a constant supply of glucose?
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