Which of the following is an example of oogamous reproduction?

(1) Ulothrix

(2) Eudorina

(3) Spirogyra

(4) Fucus

Subtopic:  Algae |
 86%
From NCERT
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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 |
 94%
From NCERT
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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 |
 93%
From NCERT
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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 |
 78%
From NCERT
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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 |
 90%
From NCERT
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Agar is not obtained from

(1) Gelidium

(2) Gracilaria

(3) Volvox

(4) All of these

Subtopic:  Algae |
 87%
From NCERT
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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 |
 85%
From NCERT
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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 |
 85%
From NCERT
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Which of the marine algae is not used as food?

(1) Laminaria

(2) Sargassum

(3) Porphyra

(4) Volvox

Subtopic:  Algae |
 89%
From NCERT
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The members of Chlorophyceae-

(1) are not Green algae

(2) are not unicellular, colonial, or filamentous plant body

(3) do not have pigments chlorophyll a and b

(4) have pigments localised in the chloroplast

Subtopic:  Algae |
 83%
From NCERT
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