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Biological Classification · Question 77

AIPMT 2008MCQEasy📈 Topic in 25% papers+4−1
1

Bacterial leaf blight of rice is caused by a species of

  1. Alternaria
  2. Erwinia
  3. Xanthomonas
  4. Pseudomonas

Answer

(3) Xanthomonas

Solution

Bacterial leaf blight of rice is caused by the bacterium Xanthomonas oryzae pv. oryzae.

⇒ As per NCERT, some bacteria are pathogens causing damage to crops; Xanthomonas species cause blights and cankers of crop plants (e.g., citrus canker by X. citri).

∵ Alternaria is a fungus (early blight of potato), Erwinia causes soft rots and Pseudomonas is mostly saprophytic or causes wilts and spots,

∴ bacterial leaf blight of rice is caused by Xanthomonas.

Answer: (3)

AIPMT 2008

Keep practising — Biological Classification

2

Thermococcus, Methanococcus and Methanobacterium exemplify

  1. bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
  2. bacteria that contain a cytoskeleton and ribosomes
  3. archaebacteria that contain protein homologous to eukaryotic core histones
  4. archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
AIPMT 2008
3

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?

  1. Archaea completely differ from both prokaryotes and eukaryotes.
  2. Archaea completely differ from prokaryotes.
  3. Archaea resemble eukarya in all respects.
  4. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.
AIPMT 2008
4

Cellulose is the major component of cell walls of

  1. Pseudomonas
  2. Saccharomyces
  3. Pythium
  4. Xanthomonas
AIPMT 2008
5

Which one of the following is a slime mould?

  1. Physarum
  2. Thiobacillus
  3. Anabaena
  4. Rhizopus
AIPMT 2007
6

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
7

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
8

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
9

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
10

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
11

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

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