Which one of the following is a true micro-ecosystem? A One litre of water from a pond kept in an air tight flask. B One litre of tap water in a flask covered over by cotton plug. C Ten litre of boiled pond water covered over by a lid. D One litre of pond water closed with a cork having gas exchange tube.

 Question

Which one of the following is a true micro-ecosystem?

A

One litre of water from a pond kept in an air tight flask.

B

One litre of tap water in a flask covered over by cotton plug.

C

Ten litre of boiled pond water covered over by a lid.

D

One litre of pond water closed with a cork having gas exchange tube.

Hard

Solution

Verified by  GMS

Correct option is D)

• Microecosystems can exist in locations which are precisely defined by critical environmental factors within small or tiny spaces. 
• Such factors may include temperature, pH, chemical, nutrient supply, presence of symbionts or solid substrates, gaseous atmosphere (aerobic or anaerobic) etc. An example is One litre of pond water closed with a cork having gas exchange tube.
• Hence,  One litre of pond water closed with a cork having gas exchange tube is a true micro-ecosystem.
• So, the correct answer is 'One litre of pond water closed with a cork having gas exchange tube'.