Transpiration at University Of Brighton | Flashcards & Summaries

Lernmaterialien für Transpiration an der University of Brighton

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TESTE DEIN WISSEN

What is transpiration.

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TESTE DEIN WISSEN

Water leaves the plant through the
stomatal pores by diffusion.

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TESTE DEIN WISSEN

what aids the movement of water up the xylem

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TESTE DEIN WISSEN

a higher hydrostatic pressure in the roots than there is at the top of the trunk.

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TESTE DEIN WISSEN

what surrounds the roots

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TESTE DEIN WISSEN

Roots are surrounded by soil particles and water. The water
contains dissolved substances (solutes) and low concentrations
of ions.

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TESTE DEIN WISSEN

End walls break down so
xylem forms a
continuous tube with no
end walls

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TESTE DEIN WISSEN

So water can form a continuous
column

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TESTE DEIN WISSEN

What advantages have the Root hair cells have

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  • (hair like) extensions that increase their surface area to increase the
    uptake of water and increase the area for channel & carrier proteins.
  • thin cell wall so they have a shorter diffusion pathway / distance.
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TESTE DEIN WISSEN

Where does water enter through

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TESTE DEIN WISSEN

Water enters through the root hair cells in the epidermis.

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TESTE DEIN WISSEN

How is the water potential of the root hair cell lowered

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TESTE DEIN WISSEN

+
Root hair cells actively transport ions from soil across their
membranes into their cytoplasm, via carrier proteins.

This lowers the water potential (Ψ becomes more NEGATIVE)
of the cytoplasm, compared to the water potential in the soil.

Water enters the root hair cells by osmosis down a water
potential gradient

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TESTE DEIN WISSEN

what does transpiration involve

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TESTE DEIN WISSEN

the mass transport of water through plants.

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TESTE DEIN WISSEN

How does water get through to the leaves

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TESTE DEIN WISSEN
  • Water enters through the root hair cells in the epidermis.
  • It then passes across the cells of the cortex, across the
    endodermis, and into the xylem vessels.
  • The xylem vessels transport water up the plant to the leaves.
Lösung ausblenden
TESTE DEIN WISSEN

Name some other mineral ions absorbed by plants and state their uses

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• Potassium ions (K+ ions) required for stomatal opening
• Magnesium ions (Mg2+ ions) constituent of chlorophyll
• Phosphate ions (PO4
3- ions) synthesis of phospholipids and a part of ATP

Lösung ausblenden
TESTE DEIN WISSEN

Give two features of root hair cells that are adaptations for uptake of water
and mineral ions

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TESTE DEIN WISSEN

• Large Surface area for absorption of water and mineral ions
• Large numbers of mitochondria (ATP required for active transport of ions)

Lösung ausblenden
TESTE DEIN WISSEN

what is the function of the epidermis

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TESTE DEIN WISSEN

one cell thick.
SPECIALISED EPIDERMIS
cells are ROOT HAIR CELLS,
these absorb water (osmosis)
+ mineral ions (AT) from soil

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  • 1317 Karteikarten
  • 73 Studierende
  • 0 Lernmaterialien

Beispielhafte Karteikarten für deinen Transpiration Kurs an der University of Brighton - von Kommilitonen auf StudySmarter erstellt!

Q:

What is transpiration.

A:

Water leaves the plant through the
stomatal pores by diffusion.

Q:

what aids the movement of water up the xylem

A:

a higher hydrostatic pressure in the roots than there is at the top of the trunk.

Q:

what surrounds the roots

A:

Roots are surrounded by soil particles and water. The water
contains dissolved substances (solutes) and low concentrations
of ions.

Q:

End walls break down so
xylem forms a
continuous tube with no
end walls

A:

So water can form a continuous
column

Q:

What advantages have the Root hair cells have

A:
  • (hair like) extensions that increase their surface area to increase the
    uptake of water and increase the area for channel & carrier proteins.
  • thin cell wall so they have a shorter diffusion pathway / distance.
Mehr Karteikarten anzeigen
Q:

Where does water enter through

A:

Water enters through the root hair cells in the epidermis.

Q:

How is the water potential of the root hair cell lowered

A:

+
Root hair cells actively transport ions from soil across their
membranes into their cytoplasm, via carrier proteins.

This lowers the water potential (Ψ becomes more NEGATIVE)
of the cytoplasm, compared to the water potential in the soil.

Water enters the root hair cells by osmosis down a water
potential gradient

Q:

what does transpiration involve

A:

the mass transport of water through plants.

Q:

How does water get through to the leaves

A:
  • Water enters through the root hair cells in the epidermis.
  • It then passes across the cells of the cortex, across the
    endodermis, and into the xylem vessels.
  • The xylem vessels transport water up the plant to the leaves.
Q:

Name some other mineral ions absorbed by plants and state their uses

A:

• Potassium ions (K+ ions) required for stomatal opening
• Magnesium ions (Mg2+ ions) constituent of chlorophyll
• Phosphate ions (PO4
3- ions) synthesis of phospholipids and a part of ATP

Q:

Give two features of root hair cells that are adaptations for uptake of water
and mineral ions

A:

• Large Surface area for absorption of water and mineral ions
• Large numbers of mitochondria (ATP required for active transport of ions)

Q:

what is the function of the epidermis

A:

one cell thick.
SPECIALISED EPIDERMIS
cells are ROOT HAIR CELLS,
these absorb water (osmosis)
+ mineral ions (AT) from soil

Transpiration

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