1. Questions Do all seaweeds contain chlorophyll?
Yes, though sometimes other pigments hide its green color.
A diver is swimming under the ocean and finds a submerged, plant-like organism growing on the sea floor. It appears to have leaves and a stem, and it is held down by what appear to be roots. Is this organism definitely a true plant?
No, it could be but it could be an alga.

2. Reproduction in Seaweeds
New Terms to know
Vegetative Reproduction = Asexual Reproduction
Diploid = 2n (chromosomes come in pairs)
Haploid = n (1/2 the number of chromosomes)

3. Alteration of Generation
1. Starts with diploid thallus. 2. Meiosis produces haploid spores. 3. Haploid spores becomes haploid thallus. 4. Haploid thallus forms gametes. 5. Fertilization of gametes produces diploid zygote. 6. Zygote grows into diploid thallus.
Sporophyte generation to gametophyte generation  
Alternates from asexual stage to sexual stage n 2n

4. Suppose a seaweed reproduces using the alteration of generations life cycle, with both generations having the same appearance. If you were looking at a population of these seaweeds, would the thalli most likely be all haploid, all diploid, or both?
Both!
Spores n
Gametes 2n

5. Kingdom Fungi No Chlorophyll - no photosynthesis! Decomposers
Some exist with algae
SYMBIOTIC RELATIONSHIP
Symbiosis- a close relationship between 2 species where at least one benefits
The result of a fungus and an algae is a lichen
Algae provide the food and fungus provides the support!

6. Lichen

7. Kingdom Plantae 3 groups to consider Sea grasses- completely marine
Salt water marshes
Mangroves
True plants with true leaves, stems and roots

8. The Sea Grasses 45 species
Have flowers, seeds, and pollen for reproduction
Provide shelter and food for animals
Roots absorb nutrients from soil and hold it in place
Horizontal stems produce vertical leaves

9. Common seagrasses
Eel grass Turtle grass

10. Saltwater marsh plants
Terrestrial plants that tolerate salt water
Only roots are submerged -only at high tide
Cord grasses can remove excess salts

11. The mangroves Salt tolerant plants Tropics and subtropics- No Frost
Can form dense forests
Several kinds
Red mangroves has prop roots to support it.
Known as “Island Makers”- roots trap and hold sediment.