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16 Cards in this Set

  • Front
  • Back
by what methods does water move?
transpiration and cohesion-tension theory
what happens in transpiration?
water is absorbed by root hairs, water flows through xylem, then exits through stomata
what direction does water move with cohesion-tension theory?
uphill through the plant
what is translocation?
the movement of food substances by the sieve tubes of the phloem
which directions can food substances move in the phloem?
both directions in thw phloem
food is usually what substance?
sucrose and is moved from a "source" to a "sink"
what is the main source of atmospheric water?
evaporation from the sea
what happens when humans destroy forests and vegetation?
they change the amount of water vapor in the air
what are detrivores?
organisms that derive energy from organic wastes and dead organisms
what would happen if the detrivores were killed off?
carbon would accumulate in the soil and have less carbon in the air, causing plants to die
80% of the atmosphere is composed of what?
N2(double bonded nitrogen)
plants can only use nitrogen in what form?
nitrate ions (NO3-) or ammonium ions (NO3+)
what do plants use nitrogen for?
to make amino acids and proteins; nitrogen is then available to consumers
what will raise the CO2 in the atmosphere and cause global warming?
an increase in the burning of fossil fuels will raise the level of CO2 in the atmosphere
why is phosphorous cycling more localized than carbon or nitrgen cycling?
because phosphorous cycling is almost entirely within the rocks and the soil
what does the greenhouse effect do?
CO2 lets the sunlight through but retainsthe heat generated by the sun; earth needs some greenhouse effect or earth would be too cold to survive