Transport in flowering plants
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What do multicellular organisms need?
A transport system
What do plant cells need
Things like water, minerals and sugars and they also need to get rid of waste substances
What happens in unicellular organisms?
Substances can diffuse directly into and out of the cell across the cell membrane - the diffusion rate is quick because of the short distances the substances have to travel
What happens in multicellular organisms? (like animals and plants)
Direct diffusion from the outer surface would be to slow - as the substances have to travel large distances to reach every single cell
How many transport systems do plants have?
Two systems
What are the two transport system called?
Xylem and phloem
What does the xylem transport?
They carry water and mineral salts from the roots up the shoot to the leaves in the transpiration stream
What does the phloem transport?
It transports sugars like sucrose and amino acids from where they are made in the leaves to other parts of the plant
What is the movement of substances around a plant called?
Translocation
What do root hairs do?
Take in water by osmosis
What do the cells on plant roots grow into?
Lon “hairs” which stick out into the soil
Why are the benefits of each branch of a root covered in millions of microscopic hairs?
Gives a plant a big sa for absorbing water from the soil
How is the water taken in by osmosis?
There usually a higher concentration of water in the soil than there is inside the plant, so the water is drawn into the root hair cell by osmosis