Chp 8 Flashcards
Plants contain two types of transport vessels
Xylem vessels
Phloem vessels
Xylem vessels
Transport water and minerals from the roots to the stem and leaves. They also offer support to the plant within the stem
Phloem vessels
Transport food materials mainly sucrose and amino acids made by the plant from photosynthesis leaves to non photosynthesising regions in the roots and stem
The vessels are arranged throughout the root stem and leaves in groups called
Vascular bundles
Xylem tissues are above or under
Xylem tissues above
Phloem tissues under
Cross section of a stem
Phloem tissues is in the top
And xylem on bottom
Half circle
Cross section of a root
Xylem tissue is a cross
Phloem tissue circle
Xylem is always …. And phloem is always on the
Inside
Outside
Minerals can be used to
Build other molecules such as proteins and chlorophyll
Xylem cells properties
Hollow and have no cell walls allow water to flow in a continuous column
How are xylem walls thickened
With lignin to prevent breakages which might break the water flow
Phloem transport direction can vary depending on
The source of nutrients and where they are needed
The vascular tissue is located in
The center of roots
Root hair cells are found in
The epidermis of plant roots
Root hair cells have extensions known as
Root hairs that grow in between soil particles
Root hairs do what to the epidermal cells
Increase the surface area aiding absorption of water and mineral ions from the soul
Root hair cells can be identified
By their root hairs which extended from the surface of the root epidermis
Osmosis causes water to
Pass into the root hair cells through the root cortex and into the xylem vessels
Once the water gets into the xylem it is carried up to
The leaves where it enters mesophyll cells
The pathway of water
Root hair cell -> root cortex —> xylem —> leaf mesophyll cells
Movement of water molecules by osmosis
Left
Transportation is defined as
The loss of water vapour from the leaves of plants
Water travels from the roots to
The leaves in the xylem vessels when it reaches the cells of the spongy mesophyll layer in the leaves it evaporates from the surface of the spongy mesophyll cells into the air cells
Water vapour then diffuses out of the
Air space into the surrounding environment via the stomata
