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Organisms and Populations — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations3 Marks
Question
Study the population growth curves in the graph given below and answer the questions which follow:

  1. Identify the growth curves ‘a’ and ‘b'.
  2. Which one of them is considered a more realistic one and why?
  3. If dN/dt=rN(K-N/K) is the equation of the logistic growth curve, what does K stand for?
  4. What is symbolised by N?
✓

Answer

  1. ‘a’- Exponential.

‘b’ Logistic/Sigmoid/Verhulst - pearl Logistic.

  1. ‘b’- because food for the animals is finite and so will soon become a limiting factor, so in normal environment, it will be the realistic one.
  2. ‘K’- Carrying capacity.
  3. ‘N’– Population density at time ‘t’.

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