Tag: a treat for mosquito

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

Diatomaceous earth is used for all except

  1. polishing

  2. filtration of offs and syrups

  3. making sound and fire proof rooms

  4. biogas production
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 The cell walls of diatoms are embedded with silica and thus the walls are indestructible. Thus, diatoms have left behind a large number of cell deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'. Being gritty this soil is used in polishing, filtration of oils and syrups.

So the correct option is "biogas production".

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

Eutely means ....................

  1. Variable muscle cells

  2. Variable locomotion

  3. Constant number of cells or nuclei in individuals of a species or in parts of their bodies

  4. Strictly marine nature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The constant number of cells or nuclei in individuals of a species or in parts of their bodies is known as eutely.

 The largest group of animals exhibiting eutely are the nematode worms, one of the largest of all animal phyla, and of great medical and agricultural importance as parasites of plants, animals, and humans. A plant that exhibits eutely is usually called a coenobium. Many species of semimicroscopic aquatic green algae exist as coenobia, such as the common Volvox and Pandorina.

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'.