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Biological Classification · Question 80

AIPMT 2008MCQMedium📈 Topic in 38% papers+4−1
1

Cellulose is the major component of cell walls of

  1. Pseudomonas
  2. Saccharomyces
  3. Pythium
  4. Xanthomonas

Answer

(3) Pythium

Solution

Pythium is an oomycete (water mould), placed with the phycomycetes in older classifications; the cell wall of oomycetes is made mainly of cellulose (with glucans).

⇒ As per NCERT, fungal cell walls are composed of chitin and polysaccharides; so the yeast Saccharomyces (a true fungus) has no cellulose wall.

⇒ Pseudomonas and Xanthomonas are bacteria whose cell walls are made of peptidoglycan.

∴ Cellulose is the major component of the cell wall of Pythium.

Answer: (3)

AIPMT 2008

Keep practising — Biological Classification

2

Which one of the following is a slime mould?

  1. Physarum
  2. Thiobacillus
  3. Anabaena
  4. Rhizopus
AIPMT 2007
3

Which one of the following statements about Mycoplasma is wrong?

  1. They are pleomorphic.
  2. They are sensitive to penicillin.
  3. They cause diseases in plants.
  4. They are also called PPLO.
AIPMT 2007
4

Which pair of the following belongs to basidiomycetes?

  1. Puffballs and Claviceps
  2. Peziza and stinkhorns
  3. Morchella and mushrooms
  4. Bird's nest fungi and puffballs
AIPMT 2007
5

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread? 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
AIPMT 2006
6

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

  1. These are all parasites
  2. These are all unicellular protists
  3. They have flagella
  4. They produce spores
AIPMT 2006
7

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
8

The bacterium ( Clostridium botulinum) that causes botulism is-

  1. A facultative aerobe
  2. An obligate aerobe
  3. A facultative anaerobe
  4. An obligate anaerobe
AIPMT 2006
9

Barophilic prokaryotes

  1. grow and multiply in very deep marine sediments
  2. occur in water containing high concentrations of barium hydroxide
  3. readily grow and divide in sea water enriched in any soluble salt of barium
  4. grow slowly in highly alkaline frozen lakes at high altitudes.
AIPMT 2005
10

There exists a close association between the alga and the fungus within a lichen. The fungus

  1. provides protection, anchorage and absorption for the alga
  2. provides food for the alga
  3. fixes the atmospheric nitrogen for the alga
  4. releases oxygen for the alga
AIPMT 2005
11

Auxospores and hormogonia are formed, respectively, by

  1. some diatoms and several cyanobacteria
  2. some cyanobacteria and many diatoms
  3. several cyanobacteria and several diatoms
  4. several diatoms and a few cyanobacteria.
AIPMT 2005

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