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Organisms and Populations — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations5 Marks
Question
Differentiate between:
  1. Predator and parasite.
  2. S-Shaped and J-Shaped growth curve.
✓

Answer

  1. Predator and parasite.
S. No.
Predator
Parasite
1.
It feeds on another organism called prey.
Itn feeds on another organism called host.
2.
Predator is larger and stronger than the prey.
Parasite is smaller and weaker than tbhe host.
3.
It kills the prey.
Parasite does not immediately kill the host though the latter may die of prolonged exploitation.
4.
Predator feeds on killed prey.
It feeds on living host.
5.
It feeds over the prey from outside.
Parasite may feed over the host from outside or inside.
  1. S-Shaped and J-Shaped growth curve.
S. No.
S-Shaped
J-Shaped
1.
 It comprises the lag phase, exponential phase and stationary phase.
 It comprises only two phases - lag phase and exponential phase.
2.
Population becomes stable with zero growth rate and the curve levels.
Population faces mass mortality, and the curve stops
3.
 It is observed by most species including humans.
It is observed in few organisms such as reindeer and annual plants.

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