Download Document

16.02-Plant Tissues Webquest
Go to http://www.botany.uwc.ac.za/sci_ed/grade10/plant_tissues/ to find the answers to
the following questions. Write the answers in complete sentences on a separate sheet of
paper.
1. What is a tissue? Tissue is a group of cells that have differentiated to perform a
specific function
2. What are 2 types of permanent tissues? Simple tissues and Complex tissues
3. Define a simple tissue. List 5 examples. A simple tissue is when a group of cells are
more or less the same.( Epidermis; Parenchyma; Chlorenchyma; Collenchyma;
Sclerenchyma)
4. Define a complex tissue. List 2 examples. Complex tissue is when a tissue is
composed of several different cells (ex. Xylem and Phloem)
5. Describe an epidermal tissue. Layer of cells that are living cells without intracellular
spaces or chloroplasts.
6. List 3 functions of an epidermal tissue.
o
o
o
o
o
o
the epidermal cells protect the underlying cells,
the waxy cuticle prevents the loss of moisture from the leaves and stems,
the transparent epidermal cells allow sunlight (for photosynthesis) to pass through
to the chloroplasts in the mesophyll tissue,
the stomata of leaves and stems allow gaseous exchange to take place which is
necessary for photosynthesis and respiration,
water vapour may be given off through the stomata during transpiration,
the root-hairs absorb water and dissolved ions from the soil.
7. Name 3 places you find epidermal cells? Roots, stems, flowers, leaves and fruits.
8. Describe sclerenchyma cells. Mature sclerenchyma cells are dead and have secondary
cell walls thickened with cellulose and usually impregnated with lignin.
9. In contrast to collenchyma, sclerenchyma cells are ___ Elastic________.
10. Two types of sclerenchyma cells are ____Sclerids____________ and
______Fibres____________. Where is each located? Sclerids are located in fruit and
seed because they are irregular in shape and the cell walls are especially thick. The
Fibres are located in the vascular bundles of angiosperms.
11. List four functions of schlerenchyma tissue.
o
o
o
o
sclerenchyma is an important supporting tissue in plants,
sclereids are responsible for the hardness of date seeds and the shell of walnut,
fibres probably play a role in the transport of water in the plant,
starch granules are stored in the young, living fibres.
12. Where are collenchyma tissues found? Under the epidermis in young stems in the
large veins of the leaves.
13. List 6 characteristics of collenchyma cells.
 Living cells
 Elongated cells that run parallel in fashion
 Thick cellulose cell walls
 Contain living protoplasm
 Contain some chloroplasts
 Intercellular spaces are small or absent.
14. What are the two functions of collenchyma tissue?
o
o
the collenchyma serve as supporting and strengthening tissue,
in collenchyma with chloroplasts, photosynthesis takes place.
15. What is the most common plant tissue? Parenchyma
16. The thin walled parenchyma cells have __ large vacuoles and distinct intercellular
spaces.
17. What are the two functions of the parenchyma cells?
o
o
the most important function of the parenchyma cells of roots and stem is the
storage of food (e.g. starch) and water,
the intercellular air spaces permit gaseous exchange.
18. Describe meristematic tissues. Meristematic tissues are cells or group of cells that
have the ability to divide. These tissues in a plant consist of small, densely packed cells
that can keep dividing to form new cells.
19. List 3 characteristics of meristematic tissues?





the cells are small,
the cells walls are thin,
cells have large nuclei,
vacuoles are absent or very small, and
there are no intercellular spaces.
20. List 5 locations of where meristematic tissue is found.





near tips of roots and stems. This is called apical meristems.
in the buds and nodes of stems.
in the cambium between the xylem and phloem in dicotyledonous trees and
shrubs.
under the epidermis of dicotyledonous trees and shrubs (cork cambium).
in the pericycle of roots, producing branch roots