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Topic Question Set

Q 1 :

Read the following statements and choose the set of correct statements.                 [2024]

 

In the members of Phaeophyceae,

 

A. Asexual reproduction occurs usually by biflagellate zoospores
B. Sexual reproduction is by oogamous method only
C. Stored food is in the form of carbohydrates, which is either mannitol or laminarin

D. The major pigments found are chlorophyll a, c, carotenoids, and xanthophyll
E. Vegetative cells have cellulosic walls, usually covered on the outside by a gelatinous coating of algin.

 

Choose the correct answer from the options given below:

  • A, B, C, and D only

     

  • B, C, D, and E only

     

  • A, C, D, and E only

     

  • A, B, C, and E only

     

(3)

Sexual reproduction in Phaeophyceae may be isogamous, anisogamous, or oogamous.

 

Q 2 :

Which classes of algae possess pigment fucoxanthin and pigment phycoerythrin, respectively?         [2023]

  • Phaeophyceae and Chlorophyceae

     

  • Phaeophyceae and Rhodophyceae

     

  • Chlorophyceae and Rhodophyceae

     

  • Rhodophyceae and Phaeophyceae

     

(2)

Phaeophyceae vary in color from olive green to various shades of brown due to the presence of varying amounts of the xanthophyll and fucoxanthin pigment. The members of Rhodophyceae are commonly called red algae because of the predominance of the red pigment, r-phycoerythrin, in their body.

 

Q 3 :

Which of the following is incorrectly matched?           [2022]

  • Ectocarpus - Fucoxanthin

     

  • Ulothrix - Mannitol

     

  • Porphyra - Floridean starch

     

  • Volvox - Starch

     

(2)

Ulothrix is a member of Chlorophyceae. The stored food material in Ulothrix is starch. Mannitol is the stored food material for members of Phaeophyceae.

 

Q 4 :

Hydrocolloid carrageen is obtained from                [2022]

  • Chlorophyceae and Phaeophyceae

     

  • Phaeophyceae and Rhodophyceae

     

  • Rhodophyceae only

     

  • Phaeophyceae only

     

(3)

Hydrocolloid carrageen is obtained from Rhodophyceae alga Chondrus crispus.

 

Q 5 :

Which of the following algae produce Carrageen?            [2021]

  • Blue-green algae

     

  • Green algae

     

  • Brown algae

     

  • Red algae

     

(4)

Carrageen is obtained from red algae Chondrus crispus and is used as a pharmaceutical emulsifier, cleaning agent, and in the textile, leather, and brewing industry.

 

Q 6 :

Which of the following algae contains mannitol as reserve food material?               [2021]

  • Ulothrix

     

  • Ectocarpus

     

  • Gracilaria

     

  • Volvox

     

(2)

Mannitol is reserve food material in Phaeophyceae, e.g., Ectocarpus.

 

Q 7 :

Floridean starch has structure similar to               [2020]

  • starch and cellulose

     

  • amylopectin and glycogen

     

  • mannitol and algin

     

  • laminarin and cellulose

     

(2)

In Rhodophyceae, food is stored as Floridean starch, which is very similar to amylopectin and glycogen in structure.

 

Q 8 :

Which of the following pairs is of unicellular algae?                    [2020]

  • Laminaria and Sargassum

     

  • Gelidium and Gracilaria

     

  • Anabaena and Volvox

     

  • Chlorella and Spirulina

     

(4)

Gelidium, Gracilaria, Laminaria, and Sargassum are multicellular. Anabaena is filamentous blue-green algae. Volvox is colonial.

 

Q 9 :

An example of colonial alga is                  [2017]

  • Volvox

     

  • Ulothrix

     

  • Spirogyra

     

  • Chlorella

     

(1)

 

 

Q 10 :

Which one of the following statements is wrong?                 [2016]

  • Algae increase the level of dissolved oxygen in the immediate environment.

     

  • Algin is obtained from red algae, and carrageenan from brown algae.

     

  • Agar-agar is obtained from Gelidium and Gracilaria.

     

  • Laminaria and Sargassum are used as food.

     

(2)

Alginic acid is obtained from brown algae, whereas carrageenan is obtained from red algae.

 

Q 11 :

Which one of the following statements is wrong?                [2015]

  • Chlorella and Spirulina are used as space food.

     

  • Mannitol is stored food in Rhodophyceae.

     

  • Algin and carrageenan are products of algae.

     

  • Agar-agar is obtained from Gelidium and Gracilaria.

     

(2)

Laminarin and mannitol are food reserves of brown algae or Phaeophyceae. Rhodophycean algae store food in the form of Floridean starch.

 

Q 12 :

Male gametes are flagellated in               [2015]

  • Ectocarpus

     

  • Spirogyra

     

  • Polysiphonia

     

  • Anabaena

     

(1)

Ectocarpus produces biflagellate gametes. Anabaena is a cyanobacteria and does not reproduce sexually. Spirogyra produces non-flagellated male gametes during conjugation, where the entire cell content functions as a gamete. Polysiphonia also produces non-flagellated spermatia.

 

Q 13 :

Which one of the following is wrong about Chara?                   [2014]

  • Upper oogonium and lower round antheridium

     

  • Globule and nucule present on the same plant

     

  • Upper antheridium and lower oogonium

     

  • Globule is male reproductive structure

     

(3)

All species of Chara reproduce sexually and show highly advanced oogamy. The sex organs are the most distinctive features of the Order Charales and are the most complicated among the thallophytes. Male and female gametangia are called antheridia and oogonia, respectively. Male fructification (cluster of antheridia) is called globule, and the female is nucule. They are borne at the nodes of short branches, globule towards the lower side and nucule (female structure) towards the upper side.

 

Q 14 :

Which one of the following shows isogamy with non-flagellated gametes?             [2014]

  • Sargassum

     

  • Ectocarpus

     

  • Ulothrix

     

  • Spirogyra

     

(4)

Sexual reproduction in algae takes place through the fusion of two gametes. In Spirogyra, the gametes are similar in size (isogamy) and non-flagellated (non-motile).