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Science 10 – Organizing Cells, Creating Tissues and Systems
Review Question: Why do larger organisms have to be multi-celled?
Multicellular VS Unicellular… depends on 3 things:1.
2.
3.
REMEMBER OCTOS WHEN THINKING ABOUT ORDER OF MATTER
O
C
T
O
S
Plants are multicellular: made of many parts, each with its own function – organized in increasing complex levels of organization
Tissues= group of cells performing same function together
Organs= tissues contributing to same function
System= group of interconnected organs (two in plants)
Types of Systems:
From the 2 types of systems, there are 3 types of tissues◦ Dermal Tissue (epidermis)
◦ Ground Tissue
◦ Vascular Tissue
Parts of the Plant Leaf System:
Cuticle Xylem-
Dermal tissue/epidermis
Phloem
Palisade Cells Stoma
Why so many on the bottom side of the leaf?
Vascular Bundle- Guard Cells
Spongy Mesophyll
What to DoLabel the specialized leaf cells in the diagram below. Then write a brief description of the function of each leaf cell.
A.
B.
C.
D.
E.
F.
G.
H.
Plant Growth
Cells divide to grow and repair damage. This cell division is called ___________________________.
In plants, increase in size results from the cell division in growth areas called ________________
What Happens in the MeristemRapidly dividing cells at the tip of the root
Cell walls thin nuclei are large vacuoles are small or absent
Why is this?
Roots – Hair like projections called root hairs – Why is this beneficial?
Root Cross Section
Think about it – If plants and animals didn’t have specialized cells, tissues and systems, how would they function (if at all)