Algae are useful

  1. Because at least half of the total carbon dioxide fixation on Earth is carried out by algae through photosynthesis.
  2. Algae being photosynthetic can increase the level of dissolved oxygen in their immediate environment
  3. They are primary producers of energy rich compounds and form the basis of the food cycles of all aquatic animals
  4. All of the above
Subtopic:  Algae |
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Hydrocolloid is

  1. Water soluble substance
  2. Water holding substance
  3. Hydrogen gas containing substance
  4. Oxygen gas containing substance
Subtopic:  Algae |
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Algin

  1. Water holding substance
  2. Obtained from brown algae
  3. Non sulfated water holding substance
  4. All of these
Subtopic:  Algae |
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Carrageen

  1. Water holding substance
  2. Obtained from red algae
  3. Sulfated water holding substance
  4. All of these
Subtopic:  Algae |
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Agar is not obtained from

  1. Gelidium
  2. Gracilaria
  3. Volvox
  4. All of these
Subtopic:  Algae |
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Agar is not used in

  1. To grow microbes
  2. To prepare ice-creams
  3. To prepare jellies
  4. To supplement protein for space travellers
Subtopic:  Algae |
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Chlorella is not

  1. An unicellular alga
  2. Rich in proteins
  3. Used as food supplement even by space travellers
  4. Used to grow microbes
Subtopic:  Algae |
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Which of the marine algae is not used as food?

  1. Laminaria
  2. Sargassum
  3. Porphyra
  4. Volvox
Subtopic:  Algae |
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The members of chlorophyceae are not

  1. Green algae
  2. Unicellular, colonial or filamentous plant body
  3. Pigments chlorophyll a and b
  4. Pigments are localised in the cytoplasm
Subtopic:  Algae |
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Chloroplasts can be discoid, plate-like, reticulate, cup-shaped, spiral or ribbon-shaped in different species. Such variety can be found in

  1. Chlorophyceae
  2. Phaeophyceae
  3. Rhodophyceae
  4. All of these
Subtopic:  Chlorophyceae: Green Algae:I | Chlorophyceae: Green Algae |
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