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10 Cards in this Set
- Front
- Back
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Basic needs for human survival |
Oxygen - creates breathable atmosphere, in water, constantly produced by plants , in water, constantly produced by plants , water- most important for life, contains oxygen, drinkable food- take light as a energy from the sun, plants take in c02 and give oxygen, plants= life warmth- c02 moderates earth temperature, is refreshed by volcanos sleep- all beings have a circadian rhythem, effected by external cues and daylight and body clock, regulates daily life |
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Planet positions |
Mercury, venus, earth, Mars, jupiter, saturn, uranus, neptune, pluto |
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Why it's possible to live on earth |
It has the goldilocks principle - breathable atmosphere, liquid water, soils for vegetation, perfect temperature |
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Food production |
Mostly from farms- an area of land or sea that's devoted to agricultural processes with the aim of producing food
Need more food for growing population
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Intensive and organic farming |
Intensive- products are increased and more effective, using chemicals. Can be harmful on health and lower quality of food. Insecticides don't break down easy, killing birds Organic- no chemical inputs and safe for the environment. Produces less more expensive food. More work and less productive |
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Plant growth |
Essential elements for plant grow = nitrogen (n) - healthy leaves phosphorus (p)- healthy shoots and roots potassium(k) - water uptake and photosynthesis (n) deficiency = yellow leaves fix= mulching with organic matter and (n) fertilisers (p) deficiency = slow growth and dull yellow foliage Fix= fertiliser (k) deficiency= yellow/purple leaves and poor flowering/fruiting Fix= potassium fertilisers |
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Nutrients can be lost in soil by... |
Plant usage - for healthy growth Leaching- dissolved in rainwater or soil irrigation But can be replaced w fertilisers--any material applied to soil to provide essential elements Most fertilisers have a mixture of 3 elements - (n), (p), (k) |
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Natural fertilisers |
Compost - broken down organic matter Manure- broken down animal poop and bedding Guano- broken down bird poop and bedding Advantage--cheap to produce Can be homemade Renewable Disadvantage--not contain correct amount of nutrients Takes long to produce |
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Synthetic fertilisers |
(n) - compounds containing nitrates or ammonium (k) - compounds which are potassium salts (p) - compounds containing phosphates Are made industrially in factories, from raw materials Advantage - exact ratio of nutrients Produced quickly and in large quantities Disadvantage--expensive Usually nonrenewable |
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Genetically modified |
Dna modified unnaturally e. G. Introduction to genes from different organism Developed to yield - resistant to disease Tolerant of herbicides |
