Name Section Number EXERCISE Protists II Post-Lab Questions 5.1 Phylum Rhodophyt
ID: 220021 • Letter: N
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Name Section Number EXERCISE Protists II Post-Lab Questions 5.1 Phylum Rhodophyta: Red Algae While wading in the warm salt water off the beaches of the Florida Keys on spring break, you stoop down to look at the feathery alga shown here. (a) What pigment gives this organism its coloration? 1. (b) What commercial products are derived from this phylum? 5.2 Phylum Chlorophyta: Green Algae 2. What two characteristics found within the green algae are clues that this group of organisms is more closely related to the land plants than red algae? 5.3 Phylum Charophyta: Desmids and Stoneworts 3. Your class takes a field trip to a freshwater stream, where you collect the organism shown microscopi- cally here. (a) What is the genus name of this organism? (b) Identify and give the function of the structure within the chloroplast at the end of the leader (line). 5.4 Phylum Amoebozoa: Slime Molds and Amoebas 4. This photomicrograph was taken from a prepared slide of a stained specimen. You observed unstained living specimens in lab Describe the mechanism by which it moves from place to place.Explanation / Answer
1. a) phycoerythrin and phycocynin are the pigments present in red algae.
b)Red algae is used as food because it is a good source of vitamins, minerals and antioxidants. It is also used in gel making like agar gel as well as has medicinal values.
2. Green algae is similar to land plants as it has chlorophyll needed for photosynthesis. It is covered by cellulose cellulosic cell wall. It consists of both chlorophyll a and b pigments.
Red algae is different from green because it contains phycocynin or phycoerythrin pigments. It also contains chlorophyll a not a and b like green algae. Red algae are mainly marine while green are fresh water. In red algae stored food is floridean starch while in green it is starch only. Red algae are multicellular while green algae are unicellular as well as multicellular.
3. It looks like spirogyra that is a freshwater green algae.
a) Its genus is filamentous charophyte.
b) Inside chloroplast there must be chlorophyll responsible for photosynthesis.
4. In amoeba pseudopodia formation takes place for locomotion.
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