Animalia Flashcards
Animal starts it’s life as a ?
Zygote
Developmental patterns
Cleavage —- morula — blastula — gastrula– blastopore
Multicellular, solid ball of cells ?
Morula
Hollow ball of cells ?
Blastula
Blastula invaginates i.e folds inward to form ?
Gastrula
Gastrula sac having an opening called ?
Blastopore
Hollow digestive system which is open at one end only and a gut is ?
Enteron
Tube like digestive stystem ?
Two openings
Which lack proper tissue organization ?
Parazoa — 1 phylum
Tissue organized into organs
Eumetazoa ( True metazoan ) — 8 phyla
Which are diploblastic?
Cnidarians ( ecto + endoderm )
Which are triploblastic ?
All except cnidarians ( Endo+ ecto+mesoderm )
Which has No germ layer ?
Poriferan
Symmetry
Overall shape of animal body
Animals that have no plane of symmetry are called
A symmetrical
example … sponges
A body with 1 main axis around which body parts are arranged in the organism and can be divided into identical halves by any plane that passes through the main axis ?
Radial symmetry
e.g — Coelenterata and echinodermata
The symmetry in which animal can be divided into identical right and left half only by a cut through the midline of its body
Bilaterally symmetrical
example — platyhelminthes to chordata
Animals which lack body cavity are called ?
Acelomate ( platyhelminthes )
Which has false body cavity and lack a true ceolom are called ?
Pseudocoelomata ( nematodes)
Animals which has a True coelom are called ?
Coelomata ( from Annelida to Chordata )
What is coelom ?
True body cavity being lined by meso dermal layers is called coelom
What Is blastopore ?
The opening which develops in an embryo at the gastrula stage … This opening forms either mouth or anus
What are protostomata ?
Protostoma — First mouth
E.g
Annelida / mollusca / arthropoda
What are deuterostomata ?
Deuterostoma — Second mouth 👄
E.g Echinodermata and Chordata
