Ecosystem

Free sample questions

Ecosystem — sample Biology questions with answers

1. Question 1

   What is meant by an ecosystem?

   • AA community of organisms living together in a habitat
   • BInteraction between living organisms and their physical environment
   • CThe dwelling place of a species
   • DThe entire population in an area

   Answer: B. Interaction between living organisms and their physical environment

   An ecosystem includes biotic and abiotic components and their interactions. Other options are only part of the definition of an ecosystem.

2. Question 2

   Which of the following is an abiotic component in an ecosystem?

   • ATree
   • BBacteria
   • CTemperature
   • DFish

   Answer: C. Temperature

   Temperature is a non-living physical factor, while tree, bacteria, and fish are biotic (living) components.

3. Question 3

   In a food chain, organisms capable of producing their own food are called?

   • APrimary consumer
   • BDecomposer
   • CProducer
   • DSecondary consumer

   Answer: C. Producer

   Producers (plants) carry out photosynthesis to produce their own food. Consumers and decomposers depend on producers.

4. Question 4

   If all producers in a forest ecosystem are destroyed, what is the immediate effect?

   • APopulation of primary consumers will increase
   • BPopulation of decomposers will increase
   • CPopulation of primary consumers will decrease
   • DPopulation of secondary consumers will remain constant

   Answer: C. Population of primary consumers will decrease

   Producers are the main food source; without them, primary consumers lack food and their population will decrease.

5. Question 5

   In a pyramid of numbers, what shape of pyramid is typically observed for a grassland ecosystem?

   • AUpright pyramid
   • BInverted pyramid
   • CRectangular pyramid
   • DSpherical pyramid

   Answer: A. Upright pyramid

   The number of producers (grass) is greater than primary consumers (rats) and so on, forming an upright pyramid.