Which of the following options most accurately describes algae in general?
1. Algae are chlorophyll-bearing, thalloid, autotrophic and largely aquatic
(both fresh water and marine) organisms.
2. Algae are chlorophyll-bearing, having highly differentiated body, autotrophic and
exclusively found in fresh water organisms.
3. Algae are chlorophyll-bearing or parasitic heterotrophic organisms,
thalloid and largely marine organisms.
4. Algae are chlorophyll-lacking, thalloid, autotrophic and largely saprophytic
organisms found in both fresh and marine waters.
Subtopic:  Algae |
 94%
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The form and size of algae is highly variable. Which of the following will not be true?

I: Volvox is a colonial alga.
II: Ulothrix and Spirogyra do not form filaments.
III: Kelps form massive plants bodies.

1. Only II 2. Only III
3. Both I and II 4. Both II and III
Subtopic:  Algae |
 83%
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Identify the incorrectly matched pair:

Alga Sexual reproduction
I: Ulothrix Isogamous; non-flagellated gametes
II: Spirogyra Isogamous; flagellated gametes
III: Udorina Anisogamous
IV: Fucus Oogamous
 
1. Only III 2. I, II and III
3. Only I and II 4. Only III and IV
Subtopic:  Algae |
 76%
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Identify the correct statements:
I: Gametes are flagellated and similar in size in Ulothrix
II: Gametes are non-flagellated and similar in size in Spirogyra
III: Gametes are dissimilar in size in Eudorina
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic:  Algae |
 91%
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Sexual reproduction takes place through non flagellated gametes that are similar in size in:

1. Ulothrix 2. Spirogyra
3. Volvox 4. Fucus
Subtopic:  Algae |
 80%
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Oogamous sexual reproduction is seen in:

1. Ulothrix 2. Spirogyra
3. Udorina 4. Fucus
Subtopic:  Algae |
 82%
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Fusion of two gametes which are dissimilar in size is termed as

 
1. Oogamy 2. Isogamy
3. Anisogamy 4. Zoogamy
Subtopic:  Algae |
 85%
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Algae are useful to man in a variety of ways. Identify the correct statements:
I: At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.
II: They are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals.
III: Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food.
IV: Agar, one of the commercial products obtained from Gelidium and Gracilaria, are used to grow microbes and in preparations of ice-creams and jellies.
V: Chlorella, a multicellular alga rich in proteins, is used as food supplement even by space travellers.

1. Only I, II, III and IV
2. Only I, II, IV and V
2. Only I, II and III
4. Only II, III and IV
Subtopic:  Algae |
 86%
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Which of the following is not an example of an edible alga?

1. Porphyra 2. Laminaria
3. Sargassum 4. Amanita
Subtopic:  Algae |
 88%
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Consider the given statements:
I: Algin is a hydrocolloid derived from brown algae
II: Carrageen is a hydrocolloid derived from green algae
III: Agar is a complex polysaccharide derived from red algae, Gelidium and Gracilaria

1. I is correct; II is incorrect; III is incorrect
2. I is incorrect; II is correct; III is correct
3. I is incorrect; II is correct; III is incorrect
4. I is correct; II is incorrect; III is correct
Subtopic:  Algae |
 86%
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