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Biological Classification · Question 59

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Which statement is wrong for viruses?

  1. All are parasites.
  2. All of them have helical symmetry.
  3. They have ability to synthesize nucleic acids and proteins.
  4. Antibiotics have no effect on them.

Answer

(2) All of them have helical symmetry.

Solution

∵ Viruses are obligate parasites; inside a living host cell they take over its machinery and synthesise their own nucleic acid and proteins ⇒ (1) and (3) are right.

∵ Antibiotics act on bacterial structures and processes that viruses lack ⇒ (4) is right.

As per NCERT, viruses show different shapes: tobacco mosaic virus is helical (rod-shaped), while many others such as bacteriophages and adenoviruses are polyhedral or complex.

∴ "All of them have helical symmetry" is the wrong statement.

Answer: (2)

AIPMT 2012 (Prelims)

Keep practising — Biological Classification

2

Maximum nutritional diversity is found in the group

  1. fungi
  2. animalia
  3. monera
  4. plantae
AIPMT 2012 (Prelims)
3

Nuclear membrane is absent in

  1. Penicillium
  2. Agaricus
  3. Volvox
  4. Nostoc
AIPMT 2012 (Prelims)
4

The cyanobacteria are also referred to as

  1. protists
  2. golden algae
  3. slime moulds
  4. blue green algae
AIPMT 2012 (Prelims)
5

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

  1. cyanobacteria
  2. archaebacteria
  3. chemosynthetic autotrophs
  4. heterotrophic bacteria
AIPMT 2012 (Prelims)
6

Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?

  1. Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
  2. Lichen is a composite organism formed from the symbiotic association of an alga and a protozoan.
  3. Yeast used in making bread and beer is a fungus.
  4. Nostoc and Anabaena are examples of protista.
AIPMT 2012 (Prelims)
7

The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of

  1. Taenia, a tapeworm
  2. Wuchereria, a filarial worm
  3. Rhizopus, a mould
  4. Ascaris, a round worm.
AIPMT 2011 (Mains)
8

Which one of the following is incorrectly matched?

  1. Root pressure – guttation
  2. Puccinia – smut
  3. Root – exarch protoxylem
  4. Cassia – imbricate aestivation
AIPMT 2011 (Prelims)
9

Select the correct combination of the statements (i – iv) regarding the characteristics of certain organisms. (i) Methanogens are archaebacteria which produce methane in marshy areas. (ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen. (iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose. (iv) Mycoplasma lack a cell wall and can survive without oxygen. The correct statements are

  1. (ii) and (iii)
  2. (i), (ii) and (iii)
  3. (ii), (iii) and (iv)
  4. (i), (ii) and (iv)
AIPMT 2010 (Mains)
10

Black (stem) rust of wheat is caused by

  1. Alternaria solani
  2. Ustilago nuda
  3. Puccinia graminis
  4. Xanthomonas oryzae
AIPMT 2010 (Mains)
11

Given below is the diagram of a bacteriophage. In which one of the options all the four parts A, B, C and D are correct? [Figure]

  1. A Collar, B Tail fibres, C Head, D Sheath
  2. A Tail fibres, B Head, C Sheath, D Collar
  3. A Head, B Sheath, C Collar, D Tail fibres
  4. A Sheath, B Collar, C Head, D Tail fibres
AIPMT 2010 (Mains)

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