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Question
Assertion :Locomotion in Hydra is carried out by two types of contractile cells.
Reason: Muscle fibres are lacking in Hydra.
Assertion :Locomotion in Hydra is carried out by two types of contractile cells.
Reason: Muscle fibres are lacking in Hydra.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hydra is a sessile Coelenterate animal that lives in a freshwater habitat. With the help of its pedal disc, it remains fastened to certain objects (substratum) in the water. Hydra perform locomotion, either in search of food or in response to some light or chemical stimulus. The muscle cells in Hydra, are lacking. That is why, locomotive movements in Hydra are largely contributed by the periodic expansion and contraction of two types of contractile cells, namely the epitheliomuscular cells and the nutritive muscular cells. With the help of these cells, locomotion in Hydra takes place in many types, such as Floating, Looping, Somersaulting, etc.So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'
Hydra is a sessile Coelenterate animal that lives in a freshwater habitat. With the help of its pedal disc, it remains fastened to certain objects (substratum) in the water. Hydra perform locomotion, either in search of food or in response to some light or chemical stimulus. The muscle cells in Hydra, are lacking. That is why, locomotive movements in Hydra are largely contributed by the periodic expansion and contraction of two types of contractile cells, namely the epitheliomuscular cells and the nutritive muscular cells. With the help of these cells, locomotion in Hydra takes place in many types, such as Floating, Looping, Somersaulting, etc.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'
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