Biology - Food supply, plant growth and productivity
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11 Terms
what is food security?
the ability of human population to access food of sufficient quality and quantity
food production must be ?
sustainable
what is all food production dependent on?
photosynthesis
factors that control plant growth
breeding of higher cultivars, use of fertiliser, protecting crops from pests, diseases and competition
Why do livestock produce less food per unit area than plant crops?
loss of energy between trophic levels
fate of light in leaves
absorbed, reflected, transmitted
what can be used to measure absorption of light?
spectroscope, spectrophotometer, colourimeter
what colour does chlorophyll a and b absorb?
red and blue wavelenghts
What do carotenoids do?
extend the range of wavelengths absorbed and pass the energy to chlorophyll for photosynthesis
products of carbon fixation (calvin cycle)
glucose
what can glucose be used for?
cellulose, respiration, stored as starch
Note 
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