Animal kingdom Flashcards
Any plane that passes through the centre does not divide them into equal halves
Asymmetry
When
any plane passing through the central axis of
the body divides the organism into two identical
halves, it is called
Radial symmetry
Where the body can be divided into identical left and
right halves in only one plane.
Bilateral symmetry
Animals in which the cells are arranged in two
embryonic layers, an external ectoderm and
an internal endoderm, are called
Diploblastic
Those animals in which the developing embryo has a third germinal layer,
mesoderm, in between the ectoderm and endoderm, are called
Tripoblastic
The body cavity, which is lined
by mesoderm is called
Coelom
Animals
possessing coelom are called
Coelomates
Such a body cavity is called
pseudocoelom and the animals possessing them
are called
Pseudocoelomates
The animals in
which the body cavity is absent are called
Acoelomates
in earthworm, the body shows this pattern called metameric segmentation and the phenomenon is known as?
Metamerism
is a mesodermally derived rod-like structure formed on the
dorsal side during embryonic development in some animals
Notochord
Animals with
notochord are called
Chordates
those animals which do not form this structure (no notochord) are called
Non-chordates
Members of phylum porifera are known as
Sponges
They are generally marine and mostly
asymmetrical animals
Sponges
Sponges have a water
transport or canal system. Water enters through
minute pores
Ostia
Water enters through
minute pores (ostia) in the body wall into a central
cavity, spongocoel
Spongocoel
Water enters through
minute pores (ostia) in the body wall into a central
cavity, spongocoel, from where it goes out
through the
Osculum