Lesson 11 - Plant transport systems Flashcards
What do plant transport systems do?
Transport substances between the leaves, stem and roots.
What is the pressure of the phloem in comparison to arteries and steam turbines in power stations?
Arteries = 16kPa
Phloem = 2000kPa
Steam turbines = 4000kPa
Why do multicellular plants need transport systems?
- High metabolic demand
- Large size
- Low surface area to volume ratio
Why is the metabolic demand of a plant large: photosynthesis.
Green parts of plants make their own oxygen and glucose via photosynthesis. However, many internal and underground structures of the plant do not photosynthesise.
They need oxygen and glucose transported to them and waste products of cell metabolism removed.
Why is the metabolic demand of a plant large: not for photosynthesis.
- Plant hormones made in one part of a plant need transporting to the areas where they have an effect.
- Mineral ions absorbed by roots need to be transported to all cells to make the proteins required for enzymes and the structures of cells.
Perennial plants?
- Grow all their life
- Reproduce each year
Largest trees in the world?
- Costal redwood
- Giant redwood
- Mountain ash
USA = 115 m
Australia = 114 m
Which part of the plant has a high surface area to volume ratio?
Leaves
What cancels out the high SA:V of the leaves?
- Trunk
- Stem
- Roots
Type of plants studying?
Dicotyledonous plants
Dicotyledonous plants:
Make seeds that contain to cotyledons
- Organs that act as food stores for the developing embryo plant
- Form the first leaves when seeds germinate.
Types of Dicotyledonous plants (dicots)?
- Herbaceous plants (important)
- Arborescent plants (woody)
Herbaceous plants:
Soft tissues and relatively short life cycle.
- Leaves and stems that lie down at the end of growing season to soil level.
Arborescent plants:
Hard, lignified tissues and long life cycle.
Name of the series of transport vessels running through the leaves, stem and roots of the dicots?
Vascular system
