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)