Question

Explain the class of Pisces and draw the structure of Pisces.​

Answer 1

Explanation:

Characteristics of Pisces:

• They are found in fresh, marine, and brackish water.
• The body is usually streamlined. Some have a spindle-shaped or elongated body as well.
• Their body is distributed into a head, trunk and tail.
• They swim with the help of their tail.
• Paired and unpaired fins represent the appendages. These help the fish to balance while swimming.
• The lateral line system functions as a sensory organ to sense the disturbances in the nearby environment.
• The body is covered with thick-seated scales, which helps by providing protection to the internal organelles.
• The gills help in respiration.
• Closed type blood circulation is observed.
• The internal skeleton is bony or cartilaginous.
• These are cold-blooded organisms.
• They may be herbivores or carnivores, oviparous or ovoviviparous.
• The sexes are separate.
• Fertilization may be external or internal.
• They lack extra-embryonic membranes.
• The digestive system is well-developed.
• The nervous system comprises of the brain and ten pairs of the cranial nerves.

Answer 2

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