BY 2 - Transport etc part three

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  • Created by: Danielle
  • Created on: 04-01-14 17:12
How are seive tubes conected to companion cells?
By plasmodesmata
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Name the features of companion cells
Dense cytoplasm, large and central nucleus, many mitochondria
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Name the features of seive tubes
No nucleus, most organelles disintergrated
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What are seive tubes made of?
Cells called seive elements placed end to end
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*43 Suggest why there are many mitochondria in companion cells
To provide energy for the seive tubes as they have lost there organelles
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*42 Name the two main types of cells in the phloem
Sieve tubes and companion cells
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What is translocation?
The transport of soluble organic materials, amino acids and sucrose
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Name the five modifications of hydrophytes
- Little lignified support tissue - Xylem is poorly developed - Little or no cuticle - Stomata on upper surface - Large air spaces
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Name the four modifications of xerophytes
- Rolled leaves - Sunken stomata - Hairs - Thick cuticle
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Other cards in this set

Card 2

Front

Name the features of companion cells

Back

Dense cytoplasm, large and central nucleus, many mitochondria

Card 3

Front

Name the features of seive tubes

Back

Preview of the front of card 3

Card 4

Front

What are seive tubes made of?

Back

Preview of the front of card 4

Card 5

Front

*43 Suggest why there are many mitochondria in companion cells

Back

Preview of the front of card 5
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