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Biological Classification · Question 76

AIPMT 2009MCQMedium📈 Topic in 38% papers+4−1
1

Which one is the wrong pairing for the disease and its causal organism?

  1. Black rust of wheat – Puccinia graminis
  2. Loose smut of wheat – Ustilago nuda
  3. Root knot of vegetables – Meloidogyne sp.
  4. Late blight of potato – Alternaria solani

Answer

(4) Late blight of potato – Alternaria solani

Solution

Black rust of wheat is caused by the rust fungus Puccinia graminis and loose smut of wheat by the smut fungus Ustilago nuda (both Basidiomycetes; NCERT names Puccinia and Ustilago as examples).

⇒ Root knot of vegetables is caused by the nematode Meloidogyne sp. (NCERT: Meloidegyne incognita infects the roots of tobacco plants).

∵ Late blight of potato is caused by Phytophthora infestans, while Alternaria solani causes early blight of potato,

∴ pairing (4) is wrong.

Answer: (4)

AIPMT 2009

Keep practising — Biological Classification

2

Bacterial leaf blight of rice is caused by a species of

  1. Alternaria
  2. Erwinia
  3. Xanthomonas
  4. Pseudomonas
AIPMT 2008
3

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
4

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
5

Cellulose is the major component of cell walls of

  1. Pseudomonas
  2. Saccharomyces
  3. Pythium
  4. Xanthomonas
AIPMT 2008
6

Which one of the following is a slime mould?

  1. Physarum
  2. Thiobacillus
  3. Anabaena
  4. Rhizopus
AIPMT 2007
7

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
8

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
9

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
10

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
11

The causative agent of mad-cow disease is a-

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

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