B4 ecology and photosynthesis

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  • Created on: 06-10-14 18:40
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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 in a habitat mapped using string , a straight line measured at
regular intervals
Small biodiversity: Forest plantation , fish farm
Large biodiversity : natural woodland ,lake
Zonation is the distribution of organisms in specific zone e.g altitude
Energy is not recycled in an ecosystem
Minerals and carbon are recycled
A pooter is a small jar used to suck up and collect insects and is active collection
A net is used to catch butterfly's or pond life and is active collection
A pitfall trap is used to collect insects in a jar and is passive collection
Quadrates are used to count the number of species in an area
Population size = number in first sample x number in second sample / number in second that
are sample marked
Population size always changes due to births and deaths
In capture + recapture it is assumed there are not births , deaths of em/immigration
A small error in the sample could lead to a large error once scaled up
The marking on the animal must not harm or effect the animals natural camouflage

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By Alexandra Lawrence
Leaves are adapted to increase the rate of gasses by having:
Large surface area
Gaps between the spongy mesophyll cells
Partially permeable membrane allows the passage of small molecules such as water , carbon
dioxide and oxygen but not large complex molecules like starch
The rate of diffusion can be increased by:
Having a shorter distance to travel
Having a greater difference in concentration
Having a greater surface area for particles to scape from
Being moist
Limiting factors of photo…read more

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By Alexandra Lawrence
Salt molecules outside the cell and sugar molecules inside cannot pass through the p.p
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 across the p.…read more

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By Alexandra Lawrence
Why is water movement useful?:
Evaporation cools the plant
Photosynthesis needs it
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
Transpiration is affected by :
Amount of light
If a plant is kept in the dark it will gain weight
If its kept in the light it will lose weight
a plant…read more

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