SCIENCE
ZOOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
coelom
|
|
|
pseudocoelom
|
|
|
acoelom
|
|
|
None of the above
|
Detailed explanation-1: -EXPLANATION: The main body cavity of mollusks is a haemocoel, through which blood circulates. The mollusks are triploblastic organisms with true coelom. The circulatory system of mollusks is open.
Detailed explanation-2: -Yes, molluscs have developed a true coelom. They are bilaterally symmetric and triploblastic. The coelom is an internal body cavity bound by mesodermal membranes. But, their coelom is reduced to a hemocoel – tiny void near the heart.
Detailed explanation-3: -Mollusks are true coelomates. These animals possess coelom, which is a ‘fluid-filled cavity’ surrounded by a layer of tissues having a mesodermal origin.
Detailed explanation-4: -Although molluscs are coelomates, their coeloms are reduced to fairly small spaces enclosing the heart and gonads. The main body cavity is a hemocoel through which blood and coelomic fluid circulate and which encloses most of the other internal organs. These hemocoelic spaces act as an efficient hydrostatic skeleton.