_______ are the first group of invertebrates which have developed a closed circulatory system.
A. Nematods
B. Annelids
C. Arthropods
D. Molluscs
Biology Mcqs
Main blood vessel of arthropods usually:
Main blood vessel of arthropods usually:
A. Lies on dorsal side
B. Lies on ventral side
C. Lies on lateral side
D. Is not present
Second largest phylum of invertebrates is____________?
Second largest phylum of invertebrates is____________?
A. Porifera
B. Arthropoda
C. Mollusca
D. Chordata
Body is globular in_________?
Body is globular in_________?
A. Cake urchin
B. Sea Urchin
C. Sea cucumber
D. Brittle star
Body is eel like in___________?
Body is eel like in___________?
A. Cyclostomata
B. Chondrichthyes
C. Osteichthyes
D. None of these
Notochord is present throughout life in___________?
Notochord is present throughout life in___________?
A. Urochordates
B. Cephalochordates
C. Chordates
D. Vertebrates
Which of the following fishes contained lungs?
Which of the following fishes contained lungs?
A. Lamprey
B. Perch
C. Plaice
D. Dipnoi
Mammals became dominant in__________?
Mammals became dominant in__________?
A. Proterozoic era
B. Mesozoic era
C. Paleozoic era
D. Cenozoic era
Which of the following are motile zooids in cnidarians?
Which of the following are motile zooids in cnidarians?
A. Polyps
B. Medusae
C. Both of these
D. None of these
In sponges fertilization takes place in____________?
In sponges fertilization takes place in____________?
A. Ectoderm
B. Mesenchyme
C. Endoderm
D. Uterus