BY 2 - Transport etc part three 0.0 / 5 ? BiologyHuman, animal and plant behaviourASWJEC Created by: DanielleCreated on: 04-01-14 17:12 How are seive tubes conected to companion cells? By plasmodesmata 1 of 9 Name the features of companion cells Dense cytoplasm, large and central nucleus, many mitochondria 2 of 9 Name the features of seive tubes No nucleus, most organelles disintergrated 3 of 9 What are seive tubes made of? Cells called seive elements placed end to end 4 of 9 *43 Suggest why there are many mitochondria in companion cells To provide energy for the seive tubes as they have lost there organelles 5 of 9 *42 Name the two main types of cells in the phloem Sieve tubes and companion cells 6 of 9 What is translocation? The transport of soluble organic materials, amino acids and sucrose 7 of 9 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 8 of 9 Name the four modifications of xerophytes - Rolled leaves - Sunken stomata - Hairs - Thick cuticle 9 of 9
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