Question

Choose the right sequence with respect to the stratification in a pond/lake ecosystem

• A. Both the assertion and the reason are true and the reason is the correct explanation for the assertion
• B. Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
• C. The assertion is true but the reason is false
• D. Both the assertion and the reason are false

Answer 1

The correct option is A Both the assertion and the reason are true and the reason is the correct explanation for the assertion

In aquatic ecosystems like lakes and large ponds organisms are organised in a recognizable structure or pattern in two or three stratas or zones:
1. A littoral zone which has rooted vegetation
2. A limnetic zone of open water containing floating plankton
3. A deep water profundal zone where we find leeches, crabs, some annelid worms and some insect larvae too.