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Given below are two statements one is labelled as Assertion (A) and the other as Reason (R).
Assertion (A) : Phytoplankton grow in abundance in the limnetic zone.
Reason (R) : Limnetic zone is open water zone.
Select the correct answer from the code given below :
Code :
Explanation
In a freshwater ecosystem like a lake, the limnetic zone is the well-lit, open-water area that extends away from the shore. Assertion (A) is correct because phytoplankton, which are microscopic photosynthetic organisms, require sunlight to produce food and thus thrive in this zone. Reason (R) is also correct as the limnetic zone is defined as the open water area, distinguished from the littoral zone (near the shore) and the profundal zone (deep water). Since phytoplankton are pelagic organisms that depend on the specific light and nutrient conditions of the open water to reach high densities, the fact that the limnetic zone is the open-water photic region explains why they are found in abundance there. Therefore, both statements are true and (R) is the correct explanation of (A).
SIMILAR QUESTIONS
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) :
Assertion (A) : Various components of an ecosystem are not interdependent.
Reason (R) : Human activities have the impacts on the environment.
Select the correct answer using the codes given below.
Codes :
Given below are two statements one is labelled as Assertion (A) and the other as Reason (R).
Assertion (A) : The territories of the Sultanate could be broadly divided into two parts - the Khalsa and the Jagirs.
Reason (R) : The Jagirs comprised of the land under the control of the State.
Select the correct answer from the code given below :
Code :
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).
Assertion (A) : The concept of Sustainable Development was popularised by the Brundtland Report.
Reason (R) : The Brundtland Report is also known as "The Limits to Growth".
Select the correct answer from the codes given below :
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).
Assertion (A) : The Himalayas are still rising.
Reason (R) : The Indian tectonic plate is colliding with the Eurasian plate.
Select the correct answer from the codes given below :