Tag: micro - organism

Quizzes (11) Questions (20)

Questions Related to micro - organism

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

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

  1. Ulva

  2. Caulerpa

  3. Chlorella

  4. Chlamydomonas
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorella is widely known in biological studies for its efficiency in photosynthesis, making it a candidate for oxygen regeneration and food production in closed environments like space crafts.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Algae are primary producers that can be cultivated as a sustainable food source, which is a significant area of research for future human nutrition.

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

Druse is

  1. Calcium-oxalate crystals

  2. Bicarbonate crystals
  3. $CaCO _3$ crystals

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology micro - organism useful actions of algae introduction to algae algae

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

  1. Gelidium

  2. Cladophora

  3. Chlorella

  4. Corallina
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The element present in thyroxin is obtained from

  1. Laminaria

  2. Polysiphonia

  3. Porphyro

  4. Gelldium
Reveal answer Fill a bubble to check yourself
A Correct answer
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'

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice botany micro - organism fungi: benefits and harmful effects useful and harmful fungi uses of fungi

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

  1. Rhizopus

  2. Aspergillus

  3. Mucor

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.