algae

Algae

Photosynthetic members of kingdom Protista, can be unicellular or multicellular.

Multicellular algae

seaweed, classified based on colour: red, brown, green

Brown algae

Tall, complex protists that are key components of marine and tidal environments

Red algae

The first multicellular organisms on Earth, found in warm waters, containing a pigment called phycoerythrin.

Green algae

Aquatic organisms similar in structure to plants, mostly found in freshwater

Vascular tissue

Tissue in plants responsible for the transport of water and nutrients (xylem and phloem)

Xylem

Dead tube-shaped cells with lignin that transport water and minerals through plants

Phloem

Living tube tissue that transports larger molecules like sugars within the plant.

some green algae reproduction

sporic reproduction

Sporophyte

produces spores from meiosis, which grow into halpoid gametophytes

brown algae parts

holdfast, stipe, leaf-like blades

Changes algae would have to make to live on land

protection from drying out, system to transport water and substances from environment to body, system to support body of plant

similarities of green algae to plants

same kind of chlorophyll, colour, cell walls contain cellulose, store food energy in form of starch, DNA analysis shows similar sequences

how plants adapted to life on earth

• production of embryos

• development of vascular tissue

• production of seeds

• production of flowers

Evolutionary link

green algae

unicellular algae

diatoms, dinoflagellates, euglenoids

parts of plant vascular tissues developed

roots and leaves

red algae example

dulse

green algae example

chlamydomonas, spirogyra

brown algae ex

kelp, rockweed

phycoerythrin

pigment found in red algae