Which is common between earthworm, leech and centipede?
They have Malphigian tubules
They are hermaphrodite
They have ventral nerve cord
None of the above
Eustachian canal connects
middle ear with external ear
middle ear with internal ear
external ear with internal ear
pharynx with middle ear
Shell of molluscs is derived from
foot
mantle
ctenidia
placoid
B.
mantle
Molluscs are soft bodied, unsegmented animals covered by a shell. Mantle is present between the shell and body wall, which secretes the shell.
Bacteria are considered plant because they
are green in colour
have rigid cell wall
have chlorophyll
have stomata