Question

Wheel organ in amphioxus is a part of of oral hood or velum?

Answer 1

Answer:

Oral hood.

Explanation:

Amphioxus also known as lancelet that are included in the phylum chordates. They are filter feeders and represent the modern cephalochordates. They provide the evolutionary sight in the origin of vertebrates.

The wheel organ is located on the sides of the oral cavity of the amphioxus. They lines the oral epithelium and contains large densed vesicles. They are made of the specialized epithelium and contains the heterochromatin nuclei. They also contain microvilli in their structure.

Thus, the answer is oral hood.

Answer 2

Wheel organ in amphioxus is part of oral hood.

Explanation:

• They are the main structures involved in intake of food. The ‘wheel organ’ is present on the sides of the oral cavity of amphioxus.  

• The epithelial lining of the cavity forms ‘six to eight pairs’ of finger like folds which is made of ciliated groove bound by a ciliated ridge.  

• These structures are collectively called the wheel organ or the muller’s organs.  

• As water enter the mouth of amphioxus, the wheel organ filters out food from the water.

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