Question

You discover a freshwater pond that has low oxygen conditions and dries up seasonally Which group within Osteichthyes could you find living here? O Dipnoi O Actinistia O Acipenseriformes D | Question 15 1 pts Which of the following is a function of the operculum? O Entry point for water to flow over gills O Protects the fragile gill tissue O Aids respiration by increasing air flow O Acts as a filter during feeding

Answer 1

Answer :

A freshwater pond that has low oxygen conditions and dries up seasonally.

Dipnoi group within Osteichthyes could living there.

Explanations :

Swim-bladder of Dipnoi is modified into lung which is used in respiration. They are also known as lung fish. Dipnoi can survive even when the rivers become completely dried up in summer. Dipnoi can dig into the mud and aestivate (summer sleep) there for atleast six months in a "cocoon" made out of clay and mucus. The mouth of the cocoon is closed by a lid which is perforated by a minute pore for the entry and exit of air. During the period of aestivation, nutrition is derived from the stored fat.

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Question 15.

Answer :

The following is a function of the operculum --

Protects the fragile gill tissue.

Explanations :

In bony fishes (Osteichthyes), operculum is a plate like bony structure that cover the branchial chamber (gills) and protect it.

The movement of jaws and operculum allow the water to flow over the gills and allowing the fish to acquire the oxygen from water for respiration.

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