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Biological Classification · Question 82

AIPMT 2007MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(2) They are sensitive to penicillin.

Solution

As per NCERT, Mycoplasma are organisms that completely lack a cell wall; they are the smallest living cells known and can survive without oxygen.

∵ No cell wall ⇒ they have no fixed shape, i.e. they are pleomorphic ⇒ (1) is correct.

∵ Penicillin acts by blocking cell-wall (peptidoglycan) synthesis ⇒ organisms without a cell wall are resistant (insensitive) to penicillin ⇒ statement (2) is wrong.

∵ Many Mycoplasma are pathogenic in animals and plants (e.g. little leaf of brinjal), and they are also called PPLO (pleuropneumonia-like organisms) ⇒ (3) and (4) are correct.

Answer: (2)

AIPMT 2007

Keep practising — Biological Classification

2

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
3

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
4

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
5

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
6

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
7

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
8

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
9

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
10

Match items in column I with those in column II. Select the correct answer from the following.

  1. (A) - (L); (B) - (J); (C) - (M); (D) - (N); (E) - (K)
  2. (A) - (K); (B) - (J); (C) - (L); (D) - (M); (E) - (N)
  3. (A) - (N); (B) - (L); (C) - (K); (D) - (N); (E) - (J)
  4. (A) - (J); (B) - (K); (C) - (N); (D) - (L); (E) - (K)
AIPMT 2005
11

Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for reproduction?

  1. Euglena
  2. Amoeba
  3. Paramecium
  4. Trypanosoma
AIPMT 2005

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