• Algae and Their Economical Importance (GATE)
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Algae and Their Economical Importance (GATE)

Description: GATE
Number of Questions: 15
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Tags: GATE Economic Importance of Algae
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Which of the following is a pair of larvicidal algae?

  1. Chara and Aulosira

  2. Chara and Chlorella

  3. Aulosira and Chlorella

  4. Pelvetia and Chlorella

  5. Pelvetia and Chara

Show answer
Correct Option: A
Explanation:

Chara and Aulosira are larivicidal algae. 

Which of the following is a filamentous blue-green algae, used as a human dietary supplement?

  1. Spirogyra

  2. Cladophora

  3. Hydrodictyon

  4. Spirulina

  5. Gracilaria

Show answer
Correct Option: D
Explanation:

This option is correct because Spirulina, filamentous blue-green algae, is cultivated around the world and used as a human dietary supplement, as well as a whole food.

Which of the following statements is/are incorrect?

  1. Red colour of members of rhodophyceae is due to presence of phycocyanin.
  2. In red algae, food is stored in the form of Floridian starch.
  3. In pheophyceae, flagella are inserted laterally.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3

Show answer
Correct Option: A
Explanation:

This option is correct because red colour of members of rhodophyceae is due to presence of phycoerythrin, while phycocyanin is a pigment found in blue-green algae.

Which of the following are used in long distance space travels?

  1. Chlorella
  2. Spirulina
  3. Synechococcus
  4. Chlamydomonas

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 3 and 4

Show answer
Correct Option: B
Explanation:

This option is correct because algae like Chlorella and Synechococcus are used in long distance space travels. 

Which of the following are brown algae?

  1. Gelidium and Fucus

  2. Batrachospermum and Gelidium

  3. Vaucheria and Nostoc

  4. Laminaria and Fucus

  5. Nostoc and Laminaria

Show answer
Correct Option: D
Explanation:

This option is correct because Laminaria is a genus of several species of brown algae, all sharing the common name kelp. Fucus is a genus of brown algae.

Which of the following algae reproduces through anisogamous mode?

  1. Ulothrix

  2. Cladophora

  3. Oedogonium

  4. Pandorina

  5. Fucus

Show answer
Correct Option: D
Explanation:

 Pandorina reproduces sexually through anisogamous mode.

Which of the following algae is used as surgical tool in the opening of wounds?

  1. Ulva

  2. Laminaria

  3. Spirogyra

  4. Digenia

  5. Sargassum

Show answer
Correct Option: B
Explanation:

Laminaria is used as surgical tool in the opening of wounds.

Which of the following algae is used in genetic research?

  1. Acetabularia

  2. Anacystis

  3. Synechococcus

  4. Chlorella

  5. Spirulina

Show answer
Correct Option: A
Explanation:

This option is correct because researches in genetics and cytology are carried out on Acetabularia.

Which of the following algae are used as source(s) of alginates?

  1. Gelidium
  2. Macrocystis
  3. Gloeopeltis
  4. Laminaria
  5. Ascophyllum

  1. 1, 2 and 3

  2. 1, 3 and 5

  3. 2, 3 and 4

  4. 2, 4 and 5

  5. 3, 4 and 5

Show answer
Correct Option: D
Explanation:

Certain algae like Macrocystic, Laminaria, Ascophyllum, Lessonia are used for alginates extraction.

Which of the following algae find application in sewage treatment?

  1. Acetabullaria
  2. Scenedesmus
  3. Chlorella
  4. Macrocystis

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: C
Explanation:

Chlamydomonas, Scenedesmus, Chlorella, Pondorhina, Euridina, etc. live in sewage water. 

Which of the following is a pair of algae with multicellular filamentous thallus organisation?

  1. Chlamydomonas and Chlorella

  2. Volvox and Gonium

  3. Ulothrix and Spyrogyra

  4. Gonium and Chlorella

  5. Chlamydomonas and Spirogyra

Show answer
Correct Option: C
Explanation:

Ulothrix and Spirogyra have multicellular filamentous thallus organisation.

Which of the following algae are used as sources of Br?

  1. Rhodomela
  2. Polysiphonia
  3. Vovox
  4. Ulothrix

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: A
Explanation:

Br is obtained from red algae, like Rhodomela and Polysiphonia.

Which of the following algae are rich sources of iodine?

  1. Laminaria
  2. Fucus
  3. Polysiphonia
  4. Chara

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 3 and 4

Show answer
Correct Option: A
Explanation:

Iodine is commercially obtained from brown algae Laminaria, Macrocystis, Fucus.

Match the columns:

 
Column – I Column – II
A. Agar agar 1. Gloiopeltis
B. Algin 2. Gelidium
C. Funori 3. Laminaria

  1. A - 1, B - 2, C - 3

  2. A - 1, B - 3, C - 2

  3. A - 2, B - 1, C - 3

  4. A - 2, B - 3, C - 1

  5. A - 3, B - 1, C - 2

Show answer
Correct Option: D
Explanation:

Correct matching is A - 2, B - 3, C - 1.

Match the columns:

 
Column – I Column – II
P. Epiphytic algae 1. Occillatoria
Q. Endophytic algae 2. Anabaena
R. Epizoic algae 3. Oedogonium
S. Endozoic algae 4. Zoochlorella

  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 2, Q - 1, R - 4, S - 3

  3. P - 3, Q - 2, R - 1, S - 4

  4. P - 4, Q - 3, R - 2, S - 1

  5. P - 1, Q - 2, R - 4, S - 3

Show answer
Correct Option: C
Explanation:

Correct matching is P - 3, Q - 2, R - 1, S - 4.

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