Plant Nutrition

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What macronutrients do plants need?
Nitrogen, phosphorous, potassium, calcium, magnesium and sulfur
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Name a few micronutrients plants need
Iron, copper, zinc, manganese, boron
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What plants can fix atmospheric nitrogen?
Legumes (root nodules)
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What else can fix atmospheric nitrogen?
Free living bacteria, lightening
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Give an example of a plant which is sensitive to air pollution
Lichen, it was found that it was more abundant the further away you were from Newcastle city centre
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What is the optimum nutrient for plants?
There isn't a specific optimum for each plant as this differs depending on the species
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How can nitrogen levels affect plant diversity?
When there are low levels, there tends to be more diversity where as when there are higher levels, there tends to be lower diversity
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How do fertilisers affect plant diversity?
Over use of them can reduce diversity
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What does Liebig's law of limiting minimum factors state?
That a plants growth and survival will be affected if one of its essential nutrients is of low abundance, even if all of the other required nutrients are of high abundance
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Give an example of how one factor could limit one species of plant but not another
Grass is limited by N in sand dunes however clover is not because clover can fix atmospheric nitrogen
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What enzyme fixes nitrogen to the legume root nodules?
Nitrogenase
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What fixes the nitrogen in Azolla (water fern)?
Cyanobacteria
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How is Azolla used when growing rice?
It is grown in the water with rice so that there is fixed nitrogen for the rice as well
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Does agricultural soil have more or less nutrient availability than non-agricultural soils?
Agricultural soil has more nurient availability
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What are the factors affecting the quantity of nutrients required
Species of plant, stage of growth, the season
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How does the season affect the quantity of nutrients needed?
More nitrogen is needed for leaf production in spring but then more potassium is needed for fruit production in summer
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Which plants can grow in soils with heavy metals?
Metallophytes
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Name 3 mechanisms of nutrient movement
Interception (roots move into new areas), Mass flow (Movement of water driven by uptake in roots, important after rainfall), diffusion (driven by ion uptake into roots, plants create steeper gradients for higher rates of absorption)
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What is root proliferation?
Increasing the amount of roots to create a greater surface area
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What is a disadvantage of root proliferation?
It costs a lot of energy
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What are depletion zones?
Areas where certain nutrients are low due to competition
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Other cards in this set

Card 2

Front

Name a few micronutrients plants need

Back

Iron, copper, zinc, manganese, boron

Card 3

Front

What plants can fix atmospheric nitrogen?

Back

Preview of the front of card 3

Card 4

Front

What else can fix atmospheric nitrogen?

Back

Preview of the front of card 4

Card 5

Front

Give an example of a plant which is sensitive to air pollution

Back

Preview of the front of card 5
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