Algae - the three classes and their pigments — practice questions

Question 1 · difficulty L1 · recall

Which pigment gives brown algae their characteristic colour?

• A. Chlorophyll b
• B. Fucoxanthin
• C. Phycoerythrin
• D. Anthocyanin

Question 2 · difficulty L2 · understanding

Which feature best distinguishes red algae from green algae in terms of their major accessory pigments?

• A. Red algae contain phycoerythrin, whereas green algae characteristically contain chlorophyll b
• B. Red algae contain fucoxanthin, whereas green algae contain phycoerythrin
• C. Red algae lack chlorophyll, whereas green algae contain chlorophyll a
• D. Red algae contain carotene only, whereas green algae lack carotenoids

Question 3 · difficulty L3 · application

An alga collected from deeper marine water appears red because it can use wavelengths that penetrate to greater depths. Which group is the best match?

• A. Rhodophyceae
• B. Phaeophyceae
• C. Chlorophyceae
• D. Bryophyta

Question 4 · difficulty L3 · understanding

Read the following statements and choose the set of correct statements: In the members of Phaeophyceae, A. Asexual reproduction occurs usually by biflagellate zoospores. B. Sexual reproduction is by oogamous method only. C. Stored food is in the form of carbohydrates which is either mannitol or laminarin. D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll. E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin. Choose the correct answer from the options given below:

• A. A, B, C and D only
• B. B, C, D and E only
• C. A, C, D and E only
• D. A, B, C and E only

Question 5 · difficulty L3 · understanding

Which classes of algae possess pigment fucoxanthin and pigment phycoerythrin, respectively ?

• A. Phaeophyceae and Chlorophyceae
• B. Phaeophyceae and Rhodophyceae
• C. Chlorophyceae and Rhodophyceae
• D. Rhodophyceae and Phaeophyceae

Question 6 · difficulty L3 · understanding

Read the following statements and identify the characters related to the alga shown in the diagram : (a) It is a member of Chlorophyceae (b) Food is stored in the form of starch (c) It is monoecious plant showing oogonium and antheridium (d) Food is stored in the form of laminarin or mannitol (e) It shows dominance of pigments Chlorophyll a, c and Fucoxanthin Choose the correct answer from the options given below :

• A. (c), (d) and (e) only
• B. (a), and (b) only
• C. (a), (b) and (c) only
• D. (a), (c) and (d) only

Question 7 · difficulty L3 · understanding

Hydrocolloid carrageen is obtained form :

• A. Chlorophyceae and Phaeophyceae
• B. Phaeophyceae and Rhodophyceae
• C. Rhodophyceae only
• D. Phaeophyceae only

Question 8 · difficulty L3 · understanding

Which of the following is incorrectly matched?

• A. Ectocarpus - Fucoxanthin
• B. Ulothrix - Mannitol
• C. Porphyra - Floridian Starch
• D. Volvox - Starch

Question 9 · difficulty L3 · understanding

Which of the following algae produce Carrageen?

• A. Blue-green algae
• B. Green algae
• C. Brown algae
• D. Red algae

Question 10 · difficulty L3 · understanding

Which of the following algae contains mannitol as reverse food material?

• A. Ulothrix
• B. Ectocarpus
• C. Gracilaria
• D. Volvox