A population is all the organisms of one species in a habitat.

Populations of different species in a habitat make up a community.

Ecosystems are self-supporting.
the only thing that's needed from outside the ecosystem is an energy source. (sun)

An ecosystem is all the organisms in a particular area, as well as all the non-living (abiotic) conditions. e.g. temperature, salinity and soil quantity.

Transects are used to investigate the distribution of organisms.

Distribution is where organisms are found within a particular area.

The distribution of organisms is affected by abiotic factors.

changes in abiotic factors can lead to zonation.

Biodiversity is a measure of the variety of life in an area.

what does it include?

Natural ecosystems have a higher biodiversity than artificial ones.

say why and give examples of the two different ecosystems.

Population is a two stage process.

what is the balanced symbol equation for this reaction?

How do plants use glucose they make?

There are three limiting factors that control the rate of photosynthesis. What are they?

Diffusion is the gradual movement of particles from an area of higher concentration to an area of lower concentration.

Name all the parts of a typical leaf.

Plants carry out both photosynthesis and respiration.
Photosynthesis only happens in the day whereas respiration takes place in both day and night.

How are leaves adapted for efficient photosynthesis, diffusion and absorbtion of light?

What is osmosis?

What are the two transport systems in plants and what do they do?

What do the xylem & phloem run alongside each other in?

What are the 3 examples of the xylems support?

Transpiration is the loss of water from the plant. How can transpiration rates be increased?

How does an increase in light intensity affect the rate of transpiration?

How does an increase in temperature affect the rate of transpiration?

How does an increase in air movement (wind) affect the rate of transpiration?

How does a decrease in humidity increase the rate of transpiration?

What are the four main minerals plants need?

Things decay because of microorganisms.
What does the rate of decay depend on?

Detrivores feed on dead & decaying material. Examples of detrivores are earthworms, maggots & woodlice. As they feed, they break it up into smaller bits. This gives a bigger surface area for smaller decomposers to work on and so speeds up decay.

Food preservation methods reduce the rate of decay. Name these methods.

Intensive farming is used to produce more food from less land.

How can farmers make the transfer of energy between organisms in a food chain more efficient?

Hydrophonics is where plants are grown without soil. What are the advantages & disadvantages of this method?

What are the main effects of intensive farming?

What is biological control?

What are the advantages & disadvantages of biological control?

Name 5 organic farming techniques.

Give examples of organic fertalisers and say what using them can do.

What is crop rotation and what can it do?

What is weeding?

What are the benefits of varying seed planting times?

What are the advantages of organic farming methods?

What are the disadvantages of organic farming?