Which phyla of algae contain members that (a) keep afloat by means of oil drople

Question

Which phyla of algae contain members that

(a) keep afloat by means of oil droplets?

(b) have internal cellulose plates?

(c) have one lateral and one trailing flagella?

(d) have gas bladders? (e)have silica walls?

(f) have sporopollenin plates ?

6. Describe the general life cycle of dinoflagellates. What kind of life cycle is it?

7. State three chemical similarities that support the view that plants evolved from a green alga of the class Charophyceae. Refer to the pigments, food storage and cell walls.

8. How do Chlorophyta, and plants differ with respect to (a) positioning and anchorage of flagella? (b) mechanisms of nuclear division? (c) orientation of microtubles during cell division? Use the answers to decide which algae most likely gave rise to land plants.

Explanation / Answer

Answer:

5).

a). Chrysophyta (Golden-brown algae)

The Chrysophyta, or golden-brown algae and diatoms, are named for the yellow pigments they possess. These single-celled algae live both in freshwater and salt water. Their cell walls have no cellulose but are composed mostly of pectin, which is often filled with silica, a compound that makes the walls quite rigid. These algae store energy both as a carbohydrate and as large oil droplets.

b). Pyrrophyta

Dinoflagellates are named after their two flagella, which lie along grooves, one like a belt and one like a tail. Many species have a heavy armor of cellulose plates, often encrusted with silica.

c). Dinohyta:

They have uniquely biflagellate. One transverse, encircling girdle flagellum and one trailing sulcal flagellum.

d). Phaeophyceae:

Brown algae have leaflike blades, stemlike stipes, anchoring holdflasts, and gas-filled bladders for buoyancy

e). Bacillariphyceae:

Diatom frustules are composed of pure hydrated silica within a layer of organic, carbon containing material.

f). Charophyta:

They have sporopollenin plates.

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