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Biological Classification · Question 97

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following statements about viruses is correct?

  1. Viruses possess their own metabolic system.
  2. All viruses contain both RNA and DNA.
  3. Viruses are obligate parasites.
  4. Nucleic acid of viruses is known as capsid.

Answer

(3) Viruses are obligate parasites.

Solution

As per NCERT, viruses are inert crystalline structures outside the living cell; once they infect a cell they take over its machinery to replicate themselves — they are obligate parasites.

∵ Viruses have no metabolic system of their own ⇒ (1) is wrong.

∵ A virus contains either RNA or DNA, never both ⇒ (2) is wrong.

∵ The capsid is the protein coat, not the nucleic acid ⇒ (4) is wrong.

Answer: (3)

AIPMT 2003

Keep practising — Biological Classification

2

Tobacco mosaic virus is a tubular filament of size

  1. 300 10 nm
  2. 300 5 nm
  3. 300 20 nm
  4. 700 30 nm
AIPMT 2003
3

Viruses are no more "alive" than isolated chromosomes because

  1. they require both RNA and DNA
  2. they both need food molecules
  3. they both require oxygen for respiration
  4. both require the environment of a cell to replicate.
AIPMT 2003
4

In which kingdom would you classify the archaea and nitrogen-fixing organisms, if the five-kingdom system of classification is used?

  1. Plantae
  2. Fungi
  3. Protista
  4. Monera
AIPMT 2003
5

The chief advantage of encystment of an Amoeba is

  1. the ability to survive during adverse physical conditions
  2. the ability to live for some time without ingesting food
  3. protection from parasites and predators
  4. the chance to get rid of accumulated waste products.
AIPMT 2003
6

In five kingdom system, the main basis of classification is

  1. structure of nucleus
  2. mode of nutrition
  3. structure of cell wall
  4. asexual reproduction.
AIPMT 2002
7

Which statement is correct for bacterial transduction?

  1. Transfer of some genes from one bacterium to another bacterium through virus.
  2. Transfer of genes from one bacterium to another bacterium by conjugation.
  3. Bacterium obtained its DNA directly from mother cell.
  4. Bacterium obtained DNA from other external source.
AIPMT 2002
8

Which fungal disease spreads by seed and flowers?

  1. Loose smut of wheat
  2. Corn smut
  3. Covered smut of barley
  4. Soft rot of potato
AIPMT 2002
9

Which of the following secretes toxins during storage conditions of crop plants?

  1. Aspergillus
  2. Penicillium
  3. Fusarium
  4. Colletotrichum
AIPMT 2002
10

In which of the following animals dimorphic nucleus is found?

  1. Amoeba proteus
  2. Trypanosoma gambiense
  3. Plasmodium vivax
  4. Paramecium caudatum
AIPMT 2002
11

In protozoa like Amoeba and Paramecium, the organ for osmoregulation is

  1. contractile vacuole
  2. mitochondria
  3. nucleus
  4. food vacuole.
AIPMT 2002

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
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