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The situation in which the trout uses the most energy for swimming
Introduction:
Fishes are vertebrates with backbones and nerve cords that are expanded into brains. There are four classes of fishes; two classes of jawless fishes; lampreys and hagfishes, the cartilaginous sharks and the bony fishes. Trout is a bony fish. They are well adapted for swimming in water.
Since the red dots indicate the most intense muscle activity, the fish in the 3rd situation swimming in free flowing stream uses the most energy.
Fishes move through water by contracting the muscle groups located on either side of their bodies. According to the given experiment, trout are swimming in free stream flow and behind a barrier.
In situation 1, the trout in free flowing stream uses little muscle power as one orange dot is present in the anterior part. The one behind a barrier hardly uses any muscle power.
In situation 2, the trout in free flowing stream uses moderate muscle power as one red and one orange dot are present in the anterior part. The one behind a barrier also uses some muscle power.
In situation 3, the trout in free flowing stream uses intense muscle power as three red dots are present and only one white dot is present. The one behind a barrier has only one orange dot so uses little muscle power.
In situation 4, the trout in free flowing stream uses no muscle power as three white dots are present. The one behind a barrier also does not use any muscle power.
Hence, it is clear from the given diagram that the trout in the 3rd situation swimming in free flowing stream uses the most energy.
Answer to Problem 16A
Since the red dots indicate the most intense muscle activity, the fish in the 3rd situation swimming in free flowing stream uses the most energy.
Explanation of Solution
Fishes move through water by contracting the muscle groups located on either side of their bodies. According to the given experiment, trout are swimming in free stream flow and behind a barrier.
In situation 1, the trout in free flowing stream uses little muscle power as one orange dot is present in the anterior part. The one behind a barrier hardly uses any muscle power.
In situation 2, the trout in free flowing stream uses moderate muscle power as one red and one orange dot are present in the anterior part. The one behind a barrier also uses some muscle power.
In situation 3, the trout in free flowing stream uses intense muscle power as three red dots are present and only one white dot is present. The one behind a barrier has only one orange dot so uses little muscle power.
In situation 4, the trout in free flowing stream uses no muscle power as three white dots are present. The one behind a barrier also does not use any muscle power.
Hence, it is clear from the given diagram that the trout in the 3rd situation swimming in free flowing stream uses the most energy.
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