Transport in plants

* explain why transpiration is a consequence of gaseous exchange

* descrbe, with the aid of diagrams, how the leaves of some xerophytes are adapted to reduce water loss by transpiration

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  • Created by: EClou
  • Created on: 02-04-15 19:24
why is the loss of water by transpiration unavoidable?
plants exchange gases with the atmosphere via their stomata for photosynthesis and this is essential for making sugars
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what is a xerophyte?
a plant that is adapted to reduce water loss so that it can survive very dry conditions
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give 2 behavioural adaptations of plants to reduce water loss
1. most stomata close at night where there is no light for photosynthesis 2. deciduous plants shed their leaves in the winter when the ground could be frozen and temperatures are too low for photosynthesis
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give 2 structural adaptations of plants to reduce water loss
1. a waxy cuticle - reduces evaporation through epidermis, 2. stomata found on the underside of leaves reducing evaporation due to direct heating from the sun.
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where does marram grass live?
on sand dunes
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why is this a harsh environment? (3)
1. any water in the sand drains away very quickly indeed, 2. sand may be salty, 3. leaves often exposed to very windy conditions
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what are the 5 adaptations of marram grass?
1. leaf rolled to trap air inside, 2. thick waxy cuticle reduce water evaporation from surface, 3. trapped air in centre with high WVP, 4. hairs on lower surface reduce air movement, 5. stomata in pits trap air with moisture close to stomata
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what is translocation?
the transport of assimilates throughout the plant, in the phloem tissue.
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what does a source do?
releases sucrose into the phloem
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what does a sink do?
removes sucrose from the phloem.
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what are parenchyma cells?
relatively unspecialised plant cells with living contents and him, permeable cell walls
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what are their three uses?
may be able to photosynthesise, store food or support young plants.
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where are they found?
all over - palisade parenchyma are found just below the epidermis in leaves, they're found in the vascular bundle
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what is found just inside the endodermis of the vascular bundle and what are they calle?
a layer of meristem cells (cells that remain able to divide) called the pericycle
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where else are meristem cells found in the vascular bundle?
in the cambium located between the xylem and the phloem
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what happens to the vascular bundle in mature woody plants?
they become continuous forming complete rings of vascular tissure
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why does this occur?
to provide support and flexibility to withstand the bending forces
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Card 2

Front

what is a xerophyte?

Back

a plant that is adapted to reduce water loss so that it can survive very dry conditions

Card 3

Front

give 2 behavioural adaptations of plants to reduce water loss

Back

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Card 4

Front

give 2 structural adaptations of plants to reduce water loss

Back

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Card 5

Front

where does marram grass live?

Back

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