Question

Mention the important features of pisces.​

Answer 1

Answer:

• 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.

Explanation:

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Answer 2

Answer:

The main features of Pisces are:

They are exclusively water living animals and include the fishes.

Their skin is covered with scales/plates.

They obtain oxygen dissolved in water by using gills.

Their body is streamlined, and a muscular tail is used for movement.

They are cold-blooded and their hearts have only two chambers.

They lay eggs.

Some fish varieties have their skeletons made of both bone and cartilage, such as Anabas, Sea horse, Rohu, and some have their skeletons made entirely of bone, e.g., Torpedo fish and Sting ray (Trygon).

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