What is the transpiration stream and what is it driven by?
Water from roots, pulled up through xylem to take the place of the evaporated water from leaf. Driven by the evaporation of water from leaf.
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What does phloem tissue do?
carries dissolved sugars from the leaves to the rest of the plant (including growing regions and storage organs)
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What causes a plant to wilt, and why do they wilt?
When water is being lost faster than it can be replaced. It wilts to the the leaves hand down and make the surface area for water loss smaller.
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Why do leaves have many air spaces?
so the co2 can come into contact with lots of cells to increase surface ares for diffusion
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Why do plants need sugar, mineral ions and water?
for energy for respiration, production of proteins and other molecules in cells.
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what controls core body temp?
thermoregulatory centre of brain
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What does your body do when you get too hot?
1. blood vessels that supply skin capillaries dilate - lose more energy by radiation 2. Sweating rate increases - cools body down as it evaporates
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What does your body do when youre too cold?
1. Blood vessels that supply skin capillaries constrict - reduces energy loss through radiation 2. Less sweat 3. Shiver - muscles need respiration which releases more energy 3. Hairs erect - insulating air layer
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How does the body increase blood sugar levels?
Pancreas secretes glucagon - makes liver turn glycogen into glucose
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why do red blood cells have no nucleus
more space to carry oxygen
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whats are platelets?
cells that help blood clot at a wound
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why is urea produced?
breakdown of amino acids
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what do patients have to take after a kidney transplant?
immunosupressants
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where is carbon dioxide naturally stored?
oceans, lakes, ponds
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what does human waste pollute?
air, water, land
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how to humans reduce the amount of land available?
building, quarrying, landfill
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Why does deforestation occur?
crops (for biofuel production) can be grown
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Why is acid rain bad?
damages trees, makes rivers acidic - animals cant live there
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What does global warming cause?
extreme climate change, sea levels rise, reduction of biodiversity, changes in migration and distribution of species
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What is methane (from biogas generator) used for?
heating, cooking, refrigeration
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Give 2 advantages and 2 disadvantages of battery chickens
reduction of heat loss when close together - food more efficient. Controlled body temp so that they dont use energy to warm up 2. Need constant monitoring, disease can spread quickly
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Other cards in this set
Card 2
Front
What is the transpiration stream and what is it driven by?
Back
Water from roots, pulled up through xylem to take the place of the evaporated water from leaf. Driven by the evaporation of water from leaf.
Card 3
Front
What does phloem tissue do?
Back
Card 4
Front
What causes a plant to wilt, and why do they wilt?
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