Tag: a treat for mosquito

Questions Related to a treat for mosquito

Diatomaceous earth is used for all except

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

  1. polishing

  2. filtration of offs and syrups

  3. making sound and fire proof rooms

  4. biogas production

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Correct Option: D
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".

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

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

  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

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Correct Option: C
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.

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

Show answer
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'.