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Organisms and Populations

AIPMT 2002MCQMedium📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2002

The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?

  1. Sigmoid
  2. Hyperbolic
  3. Ascending straight line
  4. Descending straight line

Answer

(2) Hyperbolic

Solution

As per NCERT, when resources (food and space) are unlimited, a population grows in an exponential (geometric) fashion:

dNdt = rN

Nt = N0 ert

∵ In a laboratory culture the bacteria are supplied with ample nutrients and space, the number of cells keeps multiplying with time, so a plot of population size against time gives a J-shaped curve that rises ever more steeply.

∴ The shape of the graph is the J-shaped (hyperbolic) curve.

Answer: (2)

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Ques. 2AIPMT 2002

Choose the correct sequence of stages of growth curve for bacteria.

  1. Lag, log, stationary, decline phase
  2. Lag, log, decline, stationary phase
  3. Stationary, lag, log, decline phase
  4. Decline, lag, log phase, stationary
Ques. 3AIPMT 2002

In a population, unrestricted reproductive capacity is called as -

  1. Biotic potential
  2. Birth rate
  3. Carrying capacity
  4. Fertility
Ques. 4AIPMT 2002

Cause of mimicry is -

  1. offence
  2. concealment
  3. defence
  4. both (2) and (3)
Ques. 5AIPMT 2002

Which type of association is found in between entomophilous flower and pollinating agent ?

  1. Cooperation
  2. Co-evolution
  3. Mutualism
  4. Commensalism
Ques. 6AIPMT 2002

Two different species can not live for long duration in the same niche or habitat. This law is : -

  1. Dollo's rule
  2. Weismann's theory
  3. Allen's law
  4. Gause's hypothesis

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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)