Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton.This is due to:
Correct answer: C. Coelomic fluid
- A. Gut peristalsis
- B. Setae
- C. Coelomic fluid
- D. Blood
Explanation
The hydraulic skeleton is the system of support found in soft-bodied invertebrates which relies on the incompressibility of fluids contained within the body cavity. In earthworms the coelomic fluid is under pressure within the coelom and therefore provides support for internal organs. Due to the hydraulic skeleton, during burrowing, the anterior end becomes turgid and aids in the relaxation of longitudinal muscles.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
Practise Biodiversity and Variety of Life
3,130 free Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Kingdom Animalia questions
The kind of tissue that forms the supportive structure in our pinna(external ears) is also found in:
Which one of the following structures in Pheretima is correctly matched with its function?
Frogs differ from humans because they possess:
Which one of the following is the true description about an animal concerned?
The blood of Pheretima is:
Photoreceptors of the earthworm occur on their: