Roots 2 Flashcards

1
Q

what keeps water in the tree trunk

A

cohesion and adhesion

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2
Q

Cohesion

A

bond between water molecules keeps the water column from breaking apart

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3
Q

adhesion

A

bond of water molecules to the xylem cell walls helps overcome gravitational force

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4
Q

capillary action

A

how water is pulled up a xylem tube through columns of water cells that are bound together and as 1 molecule is pulled up, it pulls the other behind it

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5
Q

transpiration

A

the evaporative loss of water from aerial parts of the plant

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6
Q

how does transpiration occur

A

evaporation of water in the stomata exerts negative pressure on the water columns in the xylem, pulling water up the stem
no energy is required from the plant

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7
Q

what is tension

A

negative pressure

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8
Q

how is opening and closing of the guard cells linked to photosynthesis

A

blue light activates a signal that turns on plasma membrane proton pump and causes starch to be converted to malic acid. solutes accumulate in the vacuole and increase turgor pressure

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9
Q

in what direction does transport into the phloem move

A

moves from source tissues to sink tissues

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10
Q

what is water and sugar movement in the phloem caused by

A

pressure flow

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11
Q

phloem loading

A

sugars from photosynthetic leaves or storage organs are pumped into the phloem using ATP for energy

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12
Q

phloem unloading

A

sugars are transported out of the phloem and metabolized

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13
Q

sink

A

areas of low pressure

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14
Q

where does water come from in phloem transport

A

drawn into the cells from the apoplast

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15
Q

what happens to the sucrose in phloem transport

A

either oxidized to produce energy or stored as starch or other storage compounds

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16
Q
A