Chlorophyta – The Green Algae

Unicellular Colonial Multi-cellular

Simple Complex

Chlamydomonas Gonium Ulva – sea lettuce

• Cells become more specialized in function

– Multi-cellular algae have many different kinds of cells that perform specific functions.

Unicellular Colonial Multi-cellular

Phaeophyta - Brown Algae

-Found in cool shallowwater-kelp Common brown algae, Fucus

Fucus (Rockweed)

Blade

Stipe (like the stem of a plant)Holdfast

Holds algae in place

Leaf-like

Reproductive structures

-helps with floating-gas-filled

Rhodophyta - Red Algae

• Surface water or• Deep waters (depth of 170m)• Most are multicellular• have special pigment that

enable them to trap energycontained in the small amount of light that penetrates

• Forms coral reef

Irish moss porphyra

Some things we talked about…

• How are algae grouped?• What gives them the colour they have?• What is the feature that separates algae from

other land plants?• What does it mean for cells to become more

specialized?

Reproduction in Algae

~Alternation of Generation~

Characteristic of all members in the plant kingdom

Alternate – shifting back and forth

• For cells to become more specialized means the cells have developed one specific function and they are responsible for the one function only. They work with other specialized cells to keep an organism alive.

• Eg. Eye cells are only for vision and cannot be replaced by muscle cells.

Asexual vs. Sexual ReproductionAsexual Sexual- Division of single parent cell- Identical offsprings- Budding - Binary fission

- Involves joining of 2 parents- exchange of genetic information- become strong and resistant to environment

Alternation of generation means shifting back and forth from asexual to sexual reproduction, or from

diploid to haploid cells

Some Vocab before we start

Diploid (2n): normal number of chromosomes

Haploid (n): half the normal number of chromosomes

For examples: humans 46 chromosomes

Diploid (2n) = 46Haploid (n) = 23

Refer to Reproductive HO

Ecological Role of Algae(Where algae fit into the world?)

• Food for ocean life• Provide homes for sea life• Produces oxygen

– 50-75% of world’s photosynthesis is done by algae• Rich in vitamins• Used to food processing• Used in modern industries – plastic, paint