Quiz
How does water get to the top of a tree?
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Fragen in diesem Quiz (6)
1What do xylem vessels transport?
- AMinerals
- BWater
- CThe products of photosynthesis
2Leaves have [blank_start]stomata[blank_end], which open to let [blank_start]carbon dioxide[blank_end] in for photosynthesis. This, unavoidably, lets water diffuse out of the leaf due to the surrounding air usually having a [blank_start]lower[blank_end] [blank_start]water potential[blank_end] than inside the leaf. This process is called [blank_start]transpiration[blank_end] which defines as the evaporation of water vapour, mainly through the stomata in the surface of a leaf. It is a [blank_start]passive[blank_end] process, using energy from the sun, which evaporates water from the [blank_start]mesophyll[blank_end] cells.
As water vapour diffuses from the air spaces in the mesophyll and through the stomata, it is replaced by water from the [blank_start]mesophyll[blank_end] cells. This in turn is replaced by water from the [blank_start]xylem[blank_end] in the veins of the leaf.- Astomata
- Bcarbon dioxide
- Clower
- Dwater potential
- Etranspiration
- Fpassive
- Gmesophyll
- Hmesophyll
- Ixylem
3Water cannot be pulled up more than [blank_start]10[blank_end]m, which is a problem tall trees must be overcome. Xylem vessels are very narrow, and water molecules tend to stick together because of the [blank_start]hydrogen[blank_end] bonds between them - this property of water is called [blank_start]cohesion[blank_end]. As water moves out of the [blank_start]xylem[blank_end] in a leaf, it drags other molecules of water behind it. Because the vessels are so [blank_start]narrow[blank_end], the column of water behind does not break, and water is pulled up all the way from the roots.
The pulling force is so great that the column of water is actually being [blank_start]stretched[blank_end] - it is under [blank_start]tension[blank_end]. The tension in the column of water tends to pull the walls of the vessels [blank_start]inwards[blank_end] slightly. However, the [blank_start]lignin[blank_end] in the walls is strong enough to stop the vessels [blank_start]collapsing[blank_end].- A10
- B5
- C20
- Dhydrogen
- Ecovalent
- Fstrong
- Gcohesion
- Htension
- Ixylem
- Jphloem
- Knarrow
- Lwide
- Mstretched
- Npulled
- Otension
- Pcohesion
- Qinwards
- Routwards
- Slignin
- Tcellulose
- Ucollapsing
- Vbursting
- Wbreaking
4Water enters the roots by [blank_start]osmosis[blank_end] and passes up the stem to the leaves, where it evaporates into the [blank_start]air spaces[blank_end] inside the leaf and then passes out to the atmosphere through the [blank_start]stomata[blank_end]. The air has a low [blank_start]water potential[blank_end] because it normally has a low percentage of [blank_start]water vapour[blank_end].
- Aosmosis
- Bdiffusion
- Ctranspiration
- Dair spaces
- Ecells
- Fstomata
- Gmesophyll
- Hwater potential
- Iconcentration
- Jwater vapour
- Kwater molecules
5Which of these are advantages of transpiration
- AThe stream of water transports mineral ions around the plant
- BThe flow of water helps to cool down the plant.
- CThe evaporation of water from the leaves has a cooling effect which prevents enzymes denaturing.
- DThe evaporation of water has a cooling effect which gives the plant energy.
6The two ideas, of cohesion and tension, used to explain how water is pulled up in a plant, are brought together by what theory?
- ACohesion-tension theory
- BTension-cohesion theory
- CCohesion theory
Informationen
- Beschreibung
- AS - Level Biology (Mass Transport in Plants) Quiz am How does water get to the top of a tree?, erstellt von Lucy Garland am 09/04/2016.
- Autor
- Lucy Garland
- Sprache
- English
- Aufrufe
- 24
- Verlauf
- Erstellt am 9 Apr 2016 · aktualisiert am 27 Apr 2016
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