Organisms

• outlines your sample area
• used to investigate the size of a population of plants or slow moving animals
• must choose areas at random

• not random
• sample the organisms along a line at regular intervals
• shows how the distribution of organims changes along that line

• temperature (limiting factor)
• nutrients (level of mineral ions and plants struggle to grow in areas with low levels of mineral ions)
• amount of light (some plants are adapted to living in low light levels and affects the distribution of animals and plants)
• availability of water (distribution changes after it rains)
• availability of oxygen or carbon dioxide (carbon dioxide is a limiting factor and plants are more vulnerable in areas of low carbon dioxide)

The green house:

• speeds up the growth of plants
• produces higher yeilds
• inside it's easier to control the environment

Controlling a crops environment:

• continuous interactions between the different factors
• in the morning, light levels and temperature may limit the rate of photosynthesis

Control though technology:

• hydroponics (when plants grow in water)
• turnover is fast
• costs lots of money
• levels are varied to get the fastest rates of photosynthesis
• controls light, temperature and carbon dioxide

• can be used to make amino acids (combine sugars with nitrate ions)
• provides energy
• built up into more complex carbohydrates like cellulose
• some glucose is changed into starch for storage
• food for the plant is moved around the plant in the phloem

• light (brighter light means faster rate of photosynthesis)
• temperature (affects all chemical reactions and as temperatures increase the reaction of photosynthesis speeds up)
• carbon dioxide (plants need carbon dioxide to make glucose)

• carbon dioxide + water -----> glucose + oxygen
  Leaf adaptations:
• have large surface area
• contains chlorophyll in the chloroplast to absorb light
• air spaces for carbon dioxide