Biology Questions and Answers
superior and the inferior epidermis of
the leaves.
- How are water, mineral
salts and food (sugar)
transported throughout the
plant?
Water, mineral salts and sugar are
transported throughout ththrough conductive vessels formed bye plant (^)
specialized tissues.
- Which are the specialized
conductive tissues of the
plants?
The vascularthe xylem and the phloem. Xylem is the tissues of the plants are (^)
plant tissue that foconduct water and mineral saltsrms the vessels that
absorbed from the soil to the plant cells.
Phloem is ththe vessels that coe plant tissue that formsnduct dissolved sugar (^)
from thproduced by photosynthesis) to ote leaves (where they are (^) her
plant cells.
- What are the cell types
that form the xylem? What are
the main features of those
cells?
The main cells otracheids and the vessel ef the xylem arlementse the
(these only in angiosperms). Ttracheids and the vessel elements arehe (^)
dead cells that have lost their cytoplasm
and only their cell wall impregnated with
lignin (an impermeable biopolymer)
remainecommunicate with nd. The tracheids feighboring tubesorm tubes that
through pores; the vessel elements do
not present pores but communicate with the successive vesselinstead they (^)
element through perforations in their
extremities.
- What are the cell types
that form the phloem? What
are the main features of those
cells?
The main cells that form the phloem are
the sieve elements and the comcells. The sieve elements form thepanion
vessel walls; they are living enucleated
cells positioned sieve tubes. Betwein series foen successiverming vesselthe (^)
elements there are communicating
pores. The compaoutside and alongsidnion cells are locatee the sieve tubesd
and they help in the absorption of the
material to be transported.
- What is the vascular
cambium? What is its
function?
Vascular cambium meristematic tissue that in is the secondaryroots and in (^)
the stem forms the vascular tissues
(xylem Usually the outer side of the vascularand phloem) of the plant. (^)
cambium produces a layer of phloem
and the inner (more central) side of thetissue produces a layer of xylem.
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