A) Both (A) and (R) are true and (R) explains
B) Both (A) and (R) are true but (R) cannot explain
C) Only (A) is correct but not (R)
D) Both (A) and (R) are wrong
Correct Answer: A
Solution :
Some freshwater lake-inhabiting zooplankter undergoes seasonal change in morphology known as cyclomorphosis. In some cladocerans, such as Daphnia dubia and Daphnia retrocurva, the head progressively changes from a rounded, compact shape to a painted, helmet like shape between spring and midsummer. Cyclomorphosis may also involve lengthening the tail spin on the carapace and producing lateral teeth on the head.
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