p5 science - plant transport system
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TRANSCRIPT
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You may refer to Textbook pages 6 to 10.
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Parts of the Plant Transport
System•Roots•Stem•Leaves
Water-carrying Tubes
Food-carrying Tubes
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Why do plants need a transport system?
• Plants need water for photosynthesis as well mineral salts to stay healthy.
• The water and mineral salts go into the plants through the root hairs.
• These can only be transported through the water-carrying tubes in the stem also known as xylem.
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Why do plants need a transport system?
• Food made in the leaves need to be transported to the other plant parts in order for the plant to survive.
• This can only be transported by the food-carrying tubes,also known as phloem.
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Tubes for Transporting
Food-carrying tubesPhloemWater-carrying tubes
XylemSugar is producedIn the leaves.The food-carryingtubes transportthis sugar from the leavesto the otherparts of theplant.
The root hairsfound on the rootsTake in waterand mineral saltsfrom the soil. The Water-carryingtubes take waterfrom the rootsto the other partsof the plant.
Take note that the water-carrying tubes are on the inner side& the food-carrying tubes are on the outer side.
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Tubes for TransportingFood-carrying tubes
Phloem
Water-carrying tubesXylem
Note the arrows forthe water & food
carrying tubes andthe directionthey travel.
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In this picture, the food-carrying tubesare cut. So, this plant is NOT able totransport food from the leaves to theother parts of the plant.
But the water-carrying tubes which are on the inner part of the stem are NOT CUT. So this plant is still able to transport water from the roots to theother parts.
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These flowers shown above did not receive these colours naturally.Can you explain how they got these colours now that you are
aware of the water-carrying tubes in stems?
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This experiment is exciting. Look atCelery stalk that has been
divided into two parts. Each partis put in different colours.
after about 1 day, you’ll noticethat the water carrying tubes in
each half will be different incolour – according to the
colour of water they were put in.
Each celery is put into differentcoloured water.
after a day, take out the celerystalks and cut across the stem.
You will notice that the water-carrying tubes in each will
have the colour of water thatthe stem was put in.
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Do Workbook Activity 1.1: Do Workbook Activity 1.1:
In the FlowIn the Flow
Do Workbook Activity 1.1: Do Workbook Activity 1.1:
In the FlowIn the Flow
Write down your observations and Write down your observations and conclusion in your workbook page conclusion in your workbook page
1-2.1-2.