Transport in plants Flashcards
(39 cards)
What are metabolic demands of a plant?
Glucose and oxygen, waste, hormones and mineral ions
What is the metabolic demand of glucose and oxygen?
It is made by photosynthesising parts of plant has to be transported to all of the cells
What are the metabolic demands of waste?
Excess oxygen must be removed
What is the metabolic demands of hormones?
Made in one part of plat and needs o be transported to were they act
What is the metabolic demands of mineral ions?
Absorbed by the root and need to be transported to all cells for protein synthesis
What is the surface area of plants?
Leaves have a large SA:V ratio but overall plant does not, so the surface alone wouldn’t be enough to get water and sugar around the plant quickly enough
Why do plants have transport systems?
Plants cannot rely on diffusion alone to supply all the needs of the different areas of the plant
Why do pants need transport systems?
They need very effective systems to move substances up and down the plant
What are dicotyledonous plants?
They have 2 halves of the seed called cotyledons
What are cotyledons?
They store nutrients for seed germination and to makes first leaves
What are types of dicotyledonous plants?
Herbaceous and arborescent
What are herbaceous plants?
They are soft tissue and a short life span as leaves and stem dies down to ground level each year
What are arborescent plants?
They are woody with hard lignified tissues and a long life cycle
What is the transport system in plants?
The vascular system
What is the vascular system made up of?
The xylem and phloem
What is the purpose of the xylem?
To transport water and mineral ions from the soil around the plant
What is the purpose of the phloem?
To transport sugars made by photosynthesis around the plant
How is the xylem and phloem arranged?
In vascular bundles
Where are vascular bundle located in roots ?
In the middle
Why is the vascular bundle in the middle?
To withstand tugging strains as stems and leaves are blown about by the wind tugging on the roots
What are the parts of the root?
Epidermis, root hair, xylem, phloem, endodermis, pericycle, cortex and parenchyma cells
What is the epidermis?
Single layer of cells on outside of root
What is the root hair?
A slender extension of specialised epidermal cells (root hair cell)
Where is the xylem located in root?
In the centre
