4.7 Transport systems in plants Flashcards
Describe the main differences between xylem and phloem in a plant
Xylem - transports water and minerals from roots to other stem and the leaves.
Phloem - transports food and mineral from leaves to the rest of the plant
Why is transport in a plant so important?
It is vital to move food made by photosynthesis around the plant because all the cells need sugar for respiration as well as for growth
Are phloem and xylem living or nonliving tissues?
phloem = living xylem = nonliving
How many transport systems do plants have?
2
What do plants make by photosynthesis?
Where do they make it?
- glucose (simple sugar)
2leaves and other green parts
What does phloem transport?
Food (sugar) made in the leaves transported to the rest of the plant for immediate use or storage
(living tissue, transported in both direction)
What is the transpiration stream?
Movement of water from the roots, through the xylem and out of the leaves.
What does xylem transport?
WATER. - TRANSPIRATION
carries water and mineral ions from the soil around the plant to the stem and leaves
(xylem - dead cells)
Describe the main differences between xylem and phloem in a plant?
Mature xylem cells are dead, phloem cells are living.
Xylem transport water and mineral ions from soil, phloem transport
dissolved sugars from photosynthesis.
Xylem found on inside of vascular bundles, phloem on outside
Why do we use protective plastic covers around the trunk of young trees? What impact would it have on the wood if the trees are not protected?
Phloem in trees found in a ring just underneath bark.
Soft bark of young trees vulnerable to damage by animals.
If complete ring of bark is eaten, transport of water from roots and
sugars from leaves stops and young tree will die.
Plastic covers protect young bark from animals.
Covers can be removed once trees are more mature and bark is harder.
If covers aren’t used, most of young trees are likely to be destroyed and
woodland will eventually die as old, mature trees are not replaced.
