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Page 1

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By Alexandra Lawrence




Biodiversity is a variety of organisms living in one habitat
Biodiversity can be affected by:
the presence of predators
Soil type
Water availability
All the animals in a garden make a community
Population is the number of organisms present in a community
Transect line is the distribution…

Page 2

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By Alexandra Lawrence




Leaves are adapted to increase the rate of gasses by having:
Large surface area
Moisture
Gaps between the spongy mesophyll cells
Stomata
Partially permeable membrane allows the passage of small molecules such as water , carbon
dioxide and oxygen but not large complex molecules like starch
The…

Page 3

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By Alexandra Lawrence




Salt molecules outside the cell and sugar molecules inside cannot pass through the p.p
membrane
Water diffuses from a high concentration to a low one through the p.p membrane
Osmosis is a type of diffusion
Osmosis is the movement of water molecules from high to low concentration…

Page 4

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By Alexandra Lawrence




Why is water movement useful?:
Evaporation cools the plant
Photosynthesis needs it
Support
Carrying Dissolved minerals
Sonongy mesophyll cells in a leaf have a coating of water (aids diffusion)
Transpiration is the evaporation and diffusion of h2o from inside of leaf too much meansit
withers and dies…

Page 5

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By Alexandra Lawrence

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