Question 1
Among all protostomes, which morphological trait is most varied?
(a) Type of symmetry
(b) Type of body cavity
(c) Number of embryonic tissues
(d) Type of development.
Question 2
Question 3
Compare The Morphological Differences Among Vertebrate Embryos And Vertebrate Adults Vertebrate Character Trait
Answer to question 1
This is the correct answer (b) Type of body cavity
The morphological traits that are described by the type of body cavity display the most variation in the case of protostomes. The kind of body cavity can be described as coelom, pseudocoelom, or the presence of acoelom.
- (a) Type of symmetry: — This is an incorrect answer as types of symmetry do not indicate morphological trait variation in protostomes.
- (c) Number of embryonic tissues: — This is an incorrect answer as a number of embryonic tissues do not indicate morphological trait variation in protostomes.
- (d) Type of development: — This is an incorrect answer as a type of development does not indicate morphological trait variation in protostomes.
Answer to question 2
Answer to question 3
| vertebrate embryological | vertebrate adult | ||
| similarities | differences | similarities | differences |
| presence of notochord | notochord degenerates into vertebral discs | ||
| presence of pharyngeal slit | pharyngeal slit develop into gill arches in bony fish. pharyngeal slit develop into ear, jaw and nose in terrestrial animals | ||
| presence of a hollow dorsal nerve chord | hollow dorsal nerve chord develops into central nervous system i.e. brain and spine | ||
| presence of tail and gill slits | adult retains tail and gill slits | gill slits present only in fishes. Lungs replaces gill slits in reptiles, amphibians and mammals. |
- Eventhough most of the vertebrates such as fishes retain gill slits and terestrial animals retains tail, humans do not show tail.