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Algae (GATE - XL)

Description: GATE NET SLET
Number of Questions: 15
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Tags: GATE NET SLET Economic Importance of Algae
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Which of the following algae are used as larvicides?

  1. Chlorella and Aulosira

  2. Chlorella and Chara

  3. Aulosira and Chara

  4. Chlorella and Pelvetia

  5. Chara and Pelvetia

Show answer
Correct Option: C
Explanation:

Chara and Aulosira are larivicidal algae.

Which of the following statements is/are correct?

  1. Red colour of members of Bangiophyceae is due to presence of phycocyanin.
  2. In red algae, food is stored in the form of floridean polysaccharides.
  3. In Phaeophyceae, 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: E
Explanation:

This option is correct because in red algae, food is stored in the form of floridean polysaccharides.

Which of the following algae find application in waste water treatment?

  1. Acetabullaria
  2. Pondorhina
  3. Euridina
  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:

This option is correct because Chlamydomonas, Scenedesmus, Chlorella, Pondorhina, Euridina, etc. are living in sewage water. 

Which of the following blue-green algae is a very high source of protein, minerals, vitamins, beneficial pigments and antioxidants?

  1. Spirulina

  2. Chlorella

  3. Chlamydomonas

  4. Quorn

  5. Aphanizomenon

Show answer
Correct Option: A
Explanation:

Spirulina (blue-green algae) is a very high source of protein, minerals, vitamins, beneficial pigments and antioxidants that can be consumed by humans and other animals.

Which of the following algae are used as source of algin?

  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 and Lessonia are used as source of algin.

Which of the following algae is/are rich sources of algin, iodine and mannitol?

  1. Laminaria
  2. Chara
  3. Polysiphonia

  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 algin, iodine and mannitol are commercially obtained from the brown algae Laminaria, Macrocystis, Fucus, etc.

Which of the following algae is used for the purpose of genetic research?

  1. Acetabularia

  2. Anacystis

  3. Synechococcus

  4. Chlorella

  5. Spirulina

Show answer
Correct Option: A
Explanation:

Researches in genetics and cytology are carried out on Acetabularia.

Which of the following is a rhodophyte used as food for humans and various species of shellfish?

  1. Spirogyra

  2. Cladophora

  3. Hydrodictyon

  4. Spirulina

  5. Gracilaria

Show answer
Correct Option: E
Explanation:

Gracilaria is a genus of rhodophytes (red algae), most well-known for its economic importance as a source of agar.

Which of the following algae are used as source of bromine?

  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:

This option is correct because bromine is obtained from red algae.

Which of the following is a pair of Phaeophyceae?

  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:

 Laminaria and Fucus are genus of several species of Phaeophyceae (brown algae).

Match the columns:

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

This option is correct because all are correctly matched.

Which of the following is a pair of algae with multicellular colonial 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: B
Explanation:

This option is correct because Volvox and Gonium both have multicellular colonial thallus organisation.

Which among the following algae is used to slowly dilate the cervix to induce labour and delivery?

  1. Ulva

  2. Laminaria

  3. Spirogyra

  4. Digenia

  5. Sargassum

Show answer
Correct Option: B
Explanation:

Laminaria is used to slowly dilate the cervix to induce labour and delivery.

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:

This option is correct because all are correctly matched.

Which of the following algae reproduce through isogamous mode?

  1. Polysiphonia

  2. Cladophora

  3. Oedogonium

  4. Pandoria

  5. Fucus

Show answer
Correct Option: B
Explanation:

This option is correct because Cladophora reproduce through isogamous mode.

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