Tag: basics of algae

Questions Related to basics of algae

Photosynthetic pigments of Rhodophyceae (red algae) are

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. chl a and b

  2. chl a and c, fucoxanthin

  3. chl a and d

  4. chl a, chl d and phycoerythrin

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Correct Option: D
Explanation:

The members of Rhodophyceae are commonly called red algae because of the predominance of the red pigment r-phycoerythin in their body. Apart from this, other major pigments found in them are chlorophyll a and chlorophyll d.

In Ulothrix, sexual reproduction is by

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. isogamy

  2. anisogamy

  3. oogamy

  4. conjugation

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Correct Option: A
Explanation:

Isogamous type of sexual reproduction is found in Ulothrix and in majority, the plants are heterothallic. The gametes are found in large number, i.e. 32 to 64 in each gametangium.

Greatest producers of organic matter are

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Crop plants

  2. Forests

  3. Plants of the land area

  4. Phytoplankton of oceans

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Correct Option: D
Explanation:

The $CO _2$ present in the oceans in the form of dissolved gas or carbonates is estimated about 11.2 X {10}$^{14}$ tonnes which is more than 50 times of the amount present in the atmosphere.

Green plants fix about 70-80 billion tonnes of $CO _2$ annually by the process of photosynthesis. Out of total $CO _2$ fixed, 90% is fixed by water plants (mainly in oceans) than 10 % fixed by terrestrial plants.
Hence, the correct answer is 'Phytoplankton of oceans'.