CLASSIFICATION
EVOLUTIONARY TRENDS IN ANIMALS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
forms the nerve cord.
|
|
|
forms the digestive tract.
|
|
|
forms the space for all non-digestive organs.
|
|
|
is a solid mass of cells.
|
Detailed explanation-1: -The coelom (or celom) is the main body cavity in most animals and is positioned inside the body to surround and contain the digestive tract and other organs. In some animals, it is lined with mesothelium. In other animals, such as molluscs, it remains undifferentiated.
Detailed explanation-2: -The true coelom is a body cavity formed during embryo development from the three germinal layers. The body cavity meaning a fluid filled space that can accomodate organs. The coelom is lined by mesodermal epithelium cells. Presence or absence of coelom is one of the criteria for classifying animals.
Detailed explanation-3: -The coelom is a body cavity filled with fluid that is found in animals and is located between the intestinal canal and the body wall. It forms from the three germinal layers during embryonic development. The inner layer of the coelom is lined by the mesodermal epithelium cells.
Detailed explanation-4: -The coelom is the fluid-filled body cavity present between the alimentary canal and the body wall. The coelom is lined by mesoderm on both the sides, towards the body wall and towards the gut. Humans have a coelom and are known to be eucoelomates (Animals that have a true coelom).