SCIENCE
ZOOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
deuterostome
|
|
|
protostome
|
|
|
insect
|
|
|
snail
|
Detailed explanation-1: -Formation of mouth and anus The deuterostome mouth develops at the opposite end of the embryo, from the blastopore, and a digestive tract develops in the middle, connecting the two.
Detailed explanation-2: -In protostomes, the site of gastrulation is said to give rise to the mouth, while in deuterostomes it forms the anus with the mouth arising from a second opening distant to the site of gastrulation.
Detailed explanation-3: -During development the mouth of deuterostomes develops from an opening into the embryonic gut other than the blastopore, which develops into the anus. The coelom (a fluid-filled body cavity lined with mesoderm) develops from buds off the embryonic gut. A number of deuterostomes have distinctive larval forms.
Detailed explanation-4: -So, the correct answer is ‘ Annelida’