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Organisms and Populations · Question 86

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

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.

⇒ 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)

AIPMT 2002

Keep practising — Organisms and Populations

2

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
AIPMT 2002
3

In a population, unrestricted reproductive capacity is called as -

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

Cause of mimicry is -

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

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

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

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
AIPMT 2002

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