3.1.3 Plant Transport – Transport in Plants Flashcards
(9 cards)
Why do larger plants need a transport system?
Plants have a high demand for sugars and water (for photosynthesis).
Larger plants have a small surface area to volume ratio, therefore a transport system is required to move these substances.
Why is oxygen able to diffuse through a plant and does not need a specialised transport system?
A plant has a low metabolic rate (because it is inactive) therefore doesn’t have a very high demand for oxygen.
What are the 2 main vascular tissues that make up the plant transport system and what are their functions?
Xylem tissue – to transport water and mineral ions upwards.
Phloem tissue – to transport assimilates (e.g. sucrose and amino acids) up or down.
Draw and label a diagram showing a cross section of a leaf:
Must include:
1 = lower epidermis
2 = upper epidermis
3 = xylem
4 = phloem
5 = palisade mesophyll
6 = spongy mesophyll
Draw and label a diagram showing a cross section of a stem:
Must include:
1 = epidermis
2 = cambium
3 = cortex
4 = xylem
5 = phloem
What is the cambium and what is its function?
It is a layer of meristem cells that divide to produce new xylem and phloem.
Why is the arrangement of xylem and phloem beneficial in a stem?
It provides the strength and flexibility to withstand the bending forces that stems are exposed to.
Draw and label a diagram showing a cross section of a root:
Must include:
1 = xylem
2 = phloem
3 = endodermis
4 = root hair cell
5 = cortex
6 = epidermis
Why is the arrangement of xylem and phloem beneficial in roots?
It allows it to withstand the pulling forces that roots are exposed to.
