Cork: The outermost protective layer of a plants bark, produces by the
Wood: Secondary xylem of a plant
Rays: A stream of material particles travelling in the same line
Bark: All the tissues external to the vascular cambium In a plant
that is growing in thickness; made up of secondary phloem, cork
cambium and cork
Transpiration- Terms to know:
Transpiration: the evaporative loss of water from a plant
Stoma: A pore surrounded by guard cells in the epidermis of a leaf.
When stomata are open CO2 enters a leaf and water and O2 exit. A
plant conserves water when its stomata are closed.
Tracheid: A tapered, porous, water-conducting and supportive cells in
plants. Chains of tracheids or vessel elements make up the water-
conducting, supportive tubes in xylem.
Cohesion: The sticking together of the molecules of the same kind,
often by hydrogen bonds
Guard cells: One of the paired cells in the epidermis of a plant
that control the opening and closing of a stoma of a leaf
Vessel elements: A short, open-ended, water-conducting and
supportive cell in plants. Chains of vessel elements or tracheids make
up the water-conducting, supportive tubes in xylem.
Adhesion: The attraction between different kinds of molecules
Turgid: Word used to describe something as swollen, bloated, puffed
up or inflated