Answer
Verified
450.3k+ views
Hint: The secretion from Hatschek's pit cells help entrapping food particles in the water.
Complete answer: Amphioxus is a modern representative of the Cephalochordata subphylum.
It is a marine Chordate animal. Zoologists take much interest in these animals because they provide evolutionary facts about the origins of vertebrates. These are commonly known as ‘sea lancelets’ due to their characteristic shape of head.
They contain many organs and systems that closely resemble those of modern fishes, though in a primitive form. The gill-slits of sea lancelets are used for feeding, not for respiration. Their circulatory system transports food throughout their body, though it does not have RBC or haemoglobin.
The roof of the oral hood in Amphioxus shows the presence of a unique structure. Here, the second rostral groove is known as Hatschek's pit. It should not be confused with Hatschek’s nephridium. Hatschek's pit is a deep ciliated fossa on the dorsal midline of the buccal cavity. Studies have shown the presence of some granulated cells in the epithelial lining of this pit. Along with ciliated cells it is responsible for the secretion of mucus. The secreted mucus helps to entrap food particles from the water.
So, the correct answer is C. Mucus.
Note: Feeding method of Amphioxus is a reflection of their habitat; they expose their anterior portion to the water and feed on plankton by the action of branchial ciliary current which passes water through the mucous sheet- this is called filter-feeding.
Complete answer: Amphioxus is a modern representative of the Cephalochordata subphylum.
It is a marine Chordate animal. Zoologists take much interest in these animals because they provide evolutionary facts about the origins of vertebrates. These are commonly known as ‘sea lancelets’ due to their characteristic shape of head.
They contain many organs and systems that closely resemble those of modern fishes, though in a primitive form. The gill-slits of sea lancelets are used for feeding, not for respiration. Their circulatory system transports food throughout their body, though it does not have RBC or haemoglobin.
The roof of the oral hood in Amphioxus shows the presence of a unique structure. Here, the second rostral groove is known as Hatschek's pit. It should not be confused with Hatschek’s nephridium. Hatschek's pit is a deep ciliated fossa on the dorsal midline of the buccal cavity. Studies have shown the presence of some granulated cells in the epithelial lining of this pit. Along with ciliated cells it is responsible for the secretion of mucus. The secreted mucus helps to entrap food particles from the water.
So, the correct answer is C. Mucus.
Note: Feeding method of Amphioxus is a reflection of their habitat; they expose their anterior portion to the water and feed on plankton by the action of branchial ciliary current which passes water through the mucous sheet- this is called filter-feeding.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Difference Between Plant Cell and Animal Cell
Give 10 examples for herbs , shrubs , climbers , creepers
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE
Write a letter to the principal requesting him to grant class 10 english CBSE