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Which of the following statements are true? 1. Algae contain chlorophyll. 2. Algae can prepare their own food. 3. Algae do not require water for photosynthesis. 4. Algae needs oxygen as raw material for photosynthesis.

Which of the following statements are true? 1. Algae contain chlorophyll. 2. Algae can prepare their own food. 3. Algae do not require water for photosynthesis. 4. Algae needs oxygen as raw material for photosynthesis. Correct Answer  1 and 2

Explanation:

Algae:

  • Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic (both fresh water and marine) organisms.
  • Algae produce their own food just like other chlorophyll bearing plants, using water and CO2 as raw materials and releasing oxygen.
  • They occur in a variety of other habitats: moist stones, soils and wood.
  • Some of them also occur in association with fungi (lichen) and animals (e.g., on sloth bear).
  • The form and size of algae are highly variable, ranging from colonial forms like Volvox and filamentous forms like Ulothrix and Spirogyra.
  • A few of the marine forms such as kelps, form massive plant bodies.
  • The algae reproduce by vegetative, asexual and sexual methods.
  • Algae are useful to man in a variety of ways.
  • At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.
  • Being photosynthetic they increase the level of dissolved oxygen in their immediate environment.
  • They are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals.

Thus, 

1. Algae contain chlorophyll: True
2. Algae can prepare their own food: True
3. Algae do not require water for photosynthesis: False
4. Algae needs oxygen as raw material for photosynthesis: False

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