1. Exit Questions. 1. How do seaweed reproduce Sexually? And Asexually? 2. List three uses of seaweeds. 3. List three characteristics of sea grasses. 4. List three characteristics of salt-marsh plants. 5. List three characteristics of mangroves

2. Seaweed Notes Part II

3. Reproduction Seaweeds can have very complex reproductive strategies. Both asexual reproduction (cell division) and sexual reproduction (using gametes) are very common.

4. Reproduction Some seaweeds produce spores that are protected by cell walls (for adverse conditions). Some spores have flagella for movement (zoospores).

5. Alternation of Generations Some sexual reproduction may involve both sexual and asexual reproduction. One generation will reproduce sexually while the next reproduces asexually. When this happens there are often two different types of thallus, one for each phase.

6. Uses of Seaweeds Food: Many cultures eat seaweeds in a variety of ways. –Most commonly we observe them in sushi. Mariculture: the farming of seaweed.

7. Uses of Seaweeds Seaweeds produce chemicals that help form gels and are often added to dairy products to keep them smooth (yogurt, ice cream, cheese, etc). They are also used to keep frostings and pies from drying out.

8. Uses of Seaweeds Shampoos, plastics, and pesticides. Cosmetics and laxatives. Hospitals can use seaweeds in some wound dressings.

9. Marine Flowering Plants There are many terrestrial flowering plants, but only a few marine flowering plants. These do have true roots, stems and leaves. –They need specialized tissues to transport water, nutrients, and food.

10. Seagrasses The only true marine flowering plants. Most are found in shallow, well protected water in many temperate and tropical regions.

11. Seagrasses Most have flat, ribbon-like leaves. There are many organisms that live among the seagrasses including herbivores (seaturtles, manatees, and some fish).

12. Salt-marsh Plants Not true marine flowering plants. They are plants that are tolerant of salty conditions. They cannot be totally submerged by salt water.

13. Salt-Marsh Plants They can survive in area that are partially submerged at high tide. Their leaves remain exposed to air and are able to excrete excess salt.

14. Mangroves Trees and shrubs adapted to live along tropical and subtropical shores. Land plants that can tolerate salt and are protected from waves.

15. Mangroves Leaves are usually thick to help reduce water loss. Some seeds will germinate while attached to the parent to give them a better chance at survival when they fall off.