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Biological Classification · Question 99

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

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.

Answer

(4) both require the environment of a cell to replicate.

Solution

An isolated chromosome cannot replicate by itself; it needs the enzymes and machinery of a cell.

As per NCERT, viruses are inert outside a living cell; once they infect a cell they take over the machinery of the host cell to replicate themselves.

∴ Both can replicate only within the environment of a living cell.

Answer: (4)

AIPMT 2003

Keep practising — Biological Classification

2

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
3

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
4

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
5

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
6

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
7

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

  1. Aspergillus
  2. Penicillium
  3. Fusarium
  4. Colletotrichum
AIPMT 2002
8

In which of the following animals dimorphic nucleus is found?

  1. Amoeba proteus
  2. Trypanosoma gambiense
  3. Plasmodium vivax
  4. Paramecium caudatum
AIPMT 2002
9

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

  1. contractile vacuole
  2. mitochondria
  3. nucleus
  4. food vacuole.
AIPMT 2002
10

Organisms which obtain energy by the oxidation of reduced inorganic compounds are called

  1. photoautotrophs
  2. chemoautotrophs
  3. saprozoic
  4. coproheterotrophs
AIPMT 2002
11

Cauliflower mosaic virus contains

  1. ss RNA
  2. ds RNA
  3. ds DNA
  4. ss DNA
AIPMT 2001

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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
Other chaptersBiomolecules (Biology)