Tag: micro - organism

Questions Related to micro - organism

Alga that is useful for prolonged space flight for liberation of oxygen, consumption of $C{O} _{2}$, disposal of wastes and formation of food is

biology micro - organism useful actions of algae introduction to algae algae

  1. Ulva

  2. Caulerpa

  3. Chlorella

  4. Chlamydomonas

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Correct Option: C

Which of the following statement supports the fact that studying about algae is important?

biology micro - organism useful actions of algae introduction to algae algae

  1. They are good experimental materials

  2. They may become important constituent of future food for human beings

  3. They can be easily grown in water tanks

  4. They renew oxygen of atmosphere and water

Show answer
Correct Option: B

Which of the following is used to make china clay?

biology micro - organism useful actions of algae introduction to algae algae

  1. Algae

  2. Fungi

  3. Soil

  4. Bacteria

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Correct Option: A

A natural antibiotic is provided by :

biology micro - organism useful actions of algae introduction to algae algae

  1. Chlorella

  2. Ulothrix

  3. Dictyota

  4. Chlamydomonas

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Correct Option: A
Explanation:

Unicellular algae chlorellin which contained in chlorella. 

So the correct option is 'Chlorella.'

Druse is

biology micro - organism useful actions of algae introduction to algae algae

  1. Calcium-oxalate crystals

  2. Bicarbonate crystals

  3. $CaCO _3$ crystals

  4. None of the above

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Correct Option: A
Explanation:
  • Druse is a rock cavity lined with a crust of projecting crystals.
  • They include crystals of calcium oxalate.
  • They provide defence against herbivory due to their toxicity. 
  • Algae, angiosperms and gymnosperms contain Calcium oxalate crystals.
  •  Hence, Druse is Calcium-oxalate crystals.
  • So, the correct answer is 'Calcium-oxalate crystals'.

A thalloid red algae used for commercial production of agar-agar is

biology micro - organism useful actions of algae introduction to algae algae

  1. Gelidium

  2. Cladophora

  3. Chlorella

  4. Corallina

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Correct Option: A
Explanation:

Agar or agar-agar is a jelly-like substance, obtained from algae. The gelling agent in agar is an unbranched polysaccharide obtained from the cell walls of some species of red algae, primarily from the genera Gelidium and Gracilaria. For commercial purposes, it is derived primarily from Gelidium amansii. In chemical terms, agar is a polymer made up of subunits of the sugar galactose.

The element present in thyroxin is obtained from

biology micro - organism useful actions of algae introduction to algae algae

  1. Laminaria

  2. Polysiphonia

  3. Porphyro

  4. Gelldium

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Correct Option: A
Explanation:

Laminaria is a type of seaweed that is native to Japan. Laminaria contains iodine, an element that the body needs to make thyroid hormones. It is also a rich source of iron and potassium. Despite serious safety concerns about Laminaria, some people use Laminaria as medicine. Laminaria is used for weight loss, high blood pressure, as a bulk laxative for constipation, and for treating radiation sickness. It is also used for preventing cancer. Laminariales (kelps) are a major biogeochemical pump of iodine. "Laminaria" species of kelp is the species highest in iodine content. 

So, the correct answer is 'Laminaria'

Algae producing tocopherol is

biology micro - organism useful actions of algae introduction to algae algae

  1. Chlorella

  2. Synechocystis

  3. Chlamydomonas

  4. Volvox

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Correct Option: B

The importance of fungi in food web lies in the fact that

botany micro - organism fungi: benefits and harmful effects useful and harmful fungi uses of fungi

  1. They are photoautotrophs.

  2. They have prokaryotic cell structure.

  3. They serve as key decomposers of dead organic matter.

  4. They generate antibiotics that kill competing plants and animals.

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Correct Option: C
Explanation:
  • Fungus are an important part of the saprophytic food chain.
  • They decompose the organic waste left by other animals and convert it into inorganic components that can be again absorbed by the plants ie the organisms of the first trophic level of the food chain and enter the food chain again.
  • So, the correct answer is 'They serve as key decomposers of dead organic matter'.

Calcium gluconate is widely used as a source of calcium for infants. It is prepared from

botany micro - organism fungi: benefits and harmful effects useful and harmful fungi uses of fungi

  1. Rhizopus

  2. Aspergillus

  3. Mucor

  4. None of the above

Show answer
Correct Option: B
Explanation:

Aspergillus niger is filamentous fungi that cause disease on vegetables and fruits called black mould. These organisms are used in fermentation processes to obtain citric acid and gluconic acid that are of commercial importance. It is also used in the manufacture of calcium gluconate. This compound is given to infants from hypocalcemia. Thus, the correct answer is option B.