B3 - Rhythms and Plant defences 0.0 / 5 ? BiologyAdaptations of organisms to their environmentGCSEEdexcel Created by: ldupre03Created on: 24-04-17 19:49 What are most plant and animal responses controlled by? rhythms 1 of 14 Define Photoperiodicity (photoperiodism) the response of a plant that changes as day length changes 2 of 14 what is the scientific name for a pattern of behaviour that changes over a 24hour period Circadian rhythm 3 of 14 what are circadian rhythms controlled by? an internal biological clock 4 of 14 what does 'Circadian' come from? (the latin word for...) Circa = about, and dies = a day 5 of 14 over how many hours does a circadian rhythm show the same pattern? 24 hours 6 of 14 how do plants protect themselves from attack? producing chemicals 7 of 14 plants producing chemicals that kill pathogens will do what? infect and cause disease 8 of 14 how do plants deter pests that try to eat them? make poisons in cells 9 of 14 which plant source can be used to treat humans e.g. malaria (by chemicals produced)? quinine - a cinchona tree 10 of 14 which plant source can be used to treat human disorders e.g. heart disorders (by chemicals produced)? digoxin - a foxglove 11 of 14 which plant source can be used to relieve symptoms e.g. pain and fever (by chemicals produced)? aspirin - a willow tree and other plants 12 of 14 pathogens and pests attack crop plants and cause damage. This reduces the what of the crop? The yield 13 of 14 what is the yield? amount of food we can get from the crop 14 of 14
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