Organisms and Populations

Biology · Class 12

Simulation · Biology · Class 12

Population interactions: the sign table

"Population interactions: the sign table" is a free, interactive Class 12 Biology simulation for NEET, built on the lesson "Population interactions" in Organisms and Populations. Set what the interaction does to species A and to species B: + helps, 0 leaves it unaffected, − harms. The name of the interaction follows from the pair of signs. Mutualism (+, +), competition (−, −), predation and parasitism (+, −), commensalism (+, 0), amensalism (−, 0).

From the lesson Population interactions in Organisms and Populations. Change the values and watch what happens.

Population interactions: the sign tableBiology · Class 12

The idea behind it

NCERT §11.1.4

  • No natural habitat holds just one species. Every species needs at least one other species to feed on.
  • Even a plant that makes its own food needs soil microbes to break down organic matter and return inorganic nutrients, and often an animal to pollinate it.
  • Plants, animals and microbes therefore interact and together form a biological community.
  • Interspecific interactions are those between populations of two different species. For each species the effect can be beneficial (+), detrimental (−) or neutral (0).
  • Mutualism (+, +): both species gain. Competition (−, −): both lose.
  • Predation and parasitism (+, −): one gains (predator, parasite) and the other is harmed (prey, host).
  • Commensalism (+, 0): one gains and the other is neither helped nor harmed. Amensalism (−, 0): one is harmed and the other is unaffected.
  • Predation, parasitism and commensalism have one feature in common: the two species live closely together.

Questions

2 answers

What does the "Population interactions: the sign table" simulation show?
Set what the interaction does to species A and to species B: + helps, 0 leaves it unaffected, − harms. The name of the interaction follows from the pair of signs.
Is this simulation free?
Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Population interactions" in Organisms and Populations (Class 12 Biology).

Embed this simulation

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