Shell of molluscs is derived from
foot
mantle
ctenidia
placoid
B.
mantle
Molluscs are the soft bodied, unsegmented animals covered by a shell. Mantle is the dorsal body wall which covers the organs of digestion, reproduction and movement. In between the shell and body wall is a covering called mantle, which secretes the shell.
Distinguish between intracellular and extracellular digestion?
What is the difference between direct and indirect development?
What are the peculiar features that you find in parasitic platyhelminthes?
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Water vascular system is the characteristic of which group of the following:
“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
How important is the presence of air bladder in Pisces?
What are the modifications that are observed in birds that help them fly?
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
Segmentation in the body is first observed in which of the following
Mock Test Series
