Tag: useful and harmful microbes

Quizzes (31) Questions (150)

Questions Related to useful and harmful microbes

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?
(a) Temperature about $25^o C . $
(b) Temperature about $5^o C . $
(c) Relative humidity of about 5 millibars
(c) Relative humidity of about 95 millibars
(e) A shaded place
(f) A brightly illuminated place.
Choose the answer from the following options :

  1. b, c and f only

  2. a, c and e only

  3. a, d and e only

  4. b, d and e only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The essential conditions for the growth of mucor in a piece of bread are having a shaded place with the optimum temperature of $25^o C $ and relative humidity of 95 millibars

So, the correct answer is 'a,d and e only'

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

In Mucor, zygospore develops from :

  1. Promycelium

  2. Progametangium

  3. Gametangia

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

In mucor during sexual reproduction, compatible strains form short, specialized hyphae called gametangia. At the point where two complementary gametangia fuse, a thick-walled, spherical zygosporangium develops. The zygosporangium typically contains a single zygospore.

So the correct option is C.

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Which of the following pairs are correctly matched?
a. Wood rooting - Fomes
b. Coprophilus - peziza
c. Primary rock colonizers - Nidularia
Select the correct answer using the codes given.

  1. $2$ and $3$
  2. $1$ and $3$
  3. $1$ and $2$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fomes causes wood rotting or heart rot in trees, which is correctly matched in pair 1. Peziza is a cup fungus that often grows on dung and is thus coprophilous, making pair 2 correctly matched. Primary rock colonizers are typically lichens, not Nidularia, so pair 3 is incorrect. Therefore, pairs 1 and 2 are correct.

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Identify the wrong statement.

  1. Haploid endosperm is typical feature of Gymnosperm

  2. Brown algae have chlorophyll a and c and fucoxanthin

  3. Archegonia are found in Bryophyta, pteridophyta and Gymnosperms.

  4. Mucor has biflagellate zoospores.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mucor is a microbial genus of molds commonly found in soil, digestive systems, plant surfaces etc. During sexual reproduction, compatible strains form short, specialized hyphae called gametangia. At the point where two gametangia fuse, a thick-walled, spherical zygosporangium develops. The zygosporangium typically contains a single zygospore.

So, the correct answer is 'Mucor has biflagellate zoospores'.

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Ergotism is due to consumption of

  1. Contaminated water

  2. Rotting vegetables

  3. Contaminated grams

  4. Stale cooked food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ergotism is caused by Claviceps in cereal grains (rye) and is the oldest known mycotoxin. Mold in the feed replaces grain with a hard black mass called an ergot. Ergotism killed thousands in the middle ages  and it produces alkaloids. Toxins affect the nervous, vascular (vasoconstriction and resultant gangrene), and endocrine systems. Clinical signs include decreased food intake and growth; necrosis of beak, comb, and toes; distorted feather development; and enteritis. Ergotism primarily affects leghorns and other laying breeds and only trace amounts remain in the meat.

So the correct option is 'contaminated grams'.

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Which of the following fungi consists chitosan in its cell wall?

  1. Penicillium

  2. Aspergillus

  3. Mucor

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

Mucor is a saprotrophic fungus. The cell wall of the fungus contains considerable amounts of chitosan. Chitosan is a linear polysaccharide composed of randomly distributed β-(1→4)linked D glucosamine and N-acetyl glucosamine. It has commercial application in agriculture, biopesticide, and winemaking. Thus the correct answer is option C.

Multiple choice biology kingdom monera, protista and fungi mycorrhiza classification of fungi useful and harmful microbes

Which is wrong statement?

  1. Archegonia are found in bryophyta, pteridophyta and gymnosperms

  2. Mucer has biflagellate zoospores

  3. Haploid endosperm is typical feature of gymnosperms
  4. Brown algae have chlorophyll $(a)$, chlorophyll $(c)$ and fucoxanthin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mucor belongs to the class zygomycetes. The members of zygomycetes bear non-motile non-flagellated gametes.

So the correct option is B.