GENERAL KNOWLEDGE

Detailed explanation-1: -Temperature and predator kairomones are among these inducing factors, and predator avoidance seems to be one of the ultimate causes for cyclomorphic changes (Dodson, 1974).

Detailed explanation-2: -It is concluded that the temperature is the most important factor responsible for the cyclomorphosis. With increasing temperature the density of water decreases hence the size of body and spines of both spines increases which let them float in the less dense water.

Detailed explanation-3: -Cyclomorphic species of Daphnia, for example, undergo changes in the shape of the head during the year; it is rounded from about midsummer to spring, and thereafter becomes helmet-shaped, reverting to the rounded shape at midsummer. Also, summer generations tend to be smaller and more transparent than at other times.

Detailed explanation-4: -Cyclomorphosis (also known as seasonal polyphenism) is the name given to the occurrence of cyclic or seasonal changes in the phenotype of an organism through successive generations. It occurs in small aquatic invertebrates that reproduce by parthenogenesis and give rise to several generations annually.

Detailed explanation-5: -Solution : The cyclic seasonal morphological variations among certain organisms is called “Cyclomorphosis". In the case of Daphnia it is an adaptation to “stabilize the movement” in water and can “resist the water currents better” to stay in the water rich in food materials.