Kingdom Animalia — Biology STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyKingdom Animalia3 Marks
Question
Write a short note on Superclass Pisces. Give one example.
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Answer
Important features of superclass Pisces:
Habitat: These are aquatic animals and are present in fresh, marine and brackish waters.
Body temperature: Pisces are poikilothermic animals i.e., cold blooded animals, in which body temperature changes according to the change in the surrounding temperature.
Sensory orgAnswer:They have lateral line system which shows the presence of rheoreceptors for the detection of water current.
Locomotion: Locomotion is by body muscles and fins. Caudal fin helps in steering wheel.
Skeleton: Exoskeleton is made up of dermal scales. It is either bony or cartilaginous.
Body shape: Body is streamlined and boat-shaped and helps to overcome resistance during swimming.
Respiration: Respiration is by gills.
Circulation: It shows single and closed circulation. Heart is two-chambered and ventral in position. Heart of fishes is described as venous heart (presence of deoxygenated blood).
Nervous system: They have a well-developed brain with large olfactory lobes.
Reproduction: Sexes are separate. Most of the fishes are oviparous, however some are viviparous.
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