2.3B Transpiration + cohesion tension theory Flashcards

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1
Q

where in a plant does photosynthesis occur

A

the leaf

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2
Q

where in. a leaf does photosynthesis occur

A

palisade mesophyll

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3
Q

how does a leaf get carbon dioxide

A

it passes into the leaf via diffusion

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4
Q

how does the oxygen produced via photosynthesis leave the leaf

A

via diffusion

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5
Q

why do internal leaf spaces contain a high conc of water vapour

A

the surface of cells in leaves are covered with thin layer of water, which evaporates into water vapour

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6
Q

why does water vapor diffuse into external air

A

level of water vapor in external air is low(via stomata) This is transpiration

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7
Q

what happens to keep water continuous during transpiration

A

water is continuously being pulled out of xylem vessels “TENSION”

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8
Q

what is the attraction called when water molecules hydrogen bond with eachother

A

cohesion

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9
Q

cohesion tension theory:

A

transpiration pull + cohesion + adhesion = water drawn into roots, moves into stem and passes out leaves

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10
Q

what evidence supports cohesion-tension?

A
  1. if a plant stem is cut, air is sucked into xylem
  2. measuring diameter of a tree truck reduces when transpiration is at its maximum
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11
Q

what is used to measure the rate of water uptake into a plant

A

bubble potometer

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12
Q

why is an air bubble placed in the capillary tube of a potometer

A

the movement of the bubble indicates the volume of water taken up by the shoot

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13
Q

what 4 environmental factors affect the rate of transpiration

A
  • light
  • temperature
  • humidity
  • air movements
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14
Q

why does light affect transpiration

A

light stimulates stomata to open and close (allowing gas exchange for photosynthesis)

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15
Q

how does temperature effect transpiration

A

more temp = more transpiration

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16
Q

how does humidity effect transpiration

A

high humidity = higher water potential in air. This causes a lower gradient, meaning less evaporation

17
Q

why do air movements effect transpiration

A

wind blows saturated air away from stomata. increasing gradient, increasing transpiration

18
Q
A