3.3.1- Transport In Plants Flashcards
Explain what a meristem is.
A layer of dividing cells, also called the pericycle.
What is the phloem?
Tissue within the vascular tissue that transports dissolved assimilates (such as sugars) up or down a plant.
Explain what the xylem is.
Tissue that transports water and soluble mineral ions upwards in a plant via mass flow.
What is the vascular tissue?
Consists of cells specialised for transporting fluids by mass flow in the leaves. Consists of xylem and phloem and is the plants transport system.
Give three reasons as to why plants need a transport system.
They have a high demand for waters and sugars that can’t be met by only diffusion as they have a low SA:V due to being large/ to move substances to and from cells quickly/ to remove wastes like O2.
The plants transports system consists of what type of tissue?
Vascular.
What is the purpose of other tissue types (for example, Collenchyma and Sclerenchyna) that may be in vascular bundles as well as the xylem and phloem?
To provide strength and support to the plant.
Explain the distribution of the vascular tissue within a dicotyledonous leaf.
It has the xylem and phloem distributed in vascular bundles, that may have other tissue types to give the bundles extra strength and support.
Explain the distribution f vascular tissue within the young root of a plant.
The vascular bundles are at the centre of the root. There is a xylem core in an x shape with the phloem in smaller pieces between the arms of the X. There is an endothermic cell later surrounding the bundles with a layer of pericycle inside.
Why is the vascular tissue arranged the way it is within the young root?
The arrangement provides strength to withstand the pulling forces of the root.
In the stem, vascular bundles are at the _______ end of the stem.
Outer.
Explain how the structure of vascular bundles differ between woody and non woody plants.
Woody plants; the bundles are separate in younger cells but continuous in older ones (provides strength and flexibility to withstand the pulling forces).
Non Soddy plants; separate and discrete bundles.
Explain how the xylem and phloem are distributed within a vascular bundle in the stem of a plant.
The xylem is going toward the centre of the cell with the phloem towards the outsider. Cambium is layered in between the xylem and phloem.
What is cambium?
A layer of meristematic cells in between the xylem and phloem that can divide and differentiate to produce new xylem and phloem.
Explain how the vascular bundles are distributed within the leaf of a dicotyledonous plant.
Vascular bundles fork the leaves’ midrib and veins. They have a branching vein system that gets smaller the further away you go from the plant. The xylem is always on top of the phloem.
