Tag: algae: benefits and harmful effects

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

Photosynthetic pigments of Rhodophyceae (red algae) are

  1. chl a and b

  2. chl a and c, fucoxanthin

  3. chl a and d

  4. chl a, chl d and phycoerythrin
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Greatest producers of organic matter are

  1. Crop plants

  2. Forests

  3. Plants of the land area

  4. Phytoplankton of oceans
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.