Biology Mcqs

_______ are the first group of invertebrates which have developed a closed circulatory system.

A. Nematods
B. Annelids
C. Arthropods
D. Molluscs

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____________?

A. Porifera
B. Arthropoda
C. Mollusca
D. Chordata

Body is globular in_________?

A. Cake urchin
B. Sea Urchin
C. Sea cucumber
D. Brittle star

Body is eel like in___________?

A. Cyclostomata
B. Chondrichthyes
C. Osteichthyes
D. None of these

Notochord is present throughout life in___________?

A. Urochordates
B. Cephalochordates
C. Chordates
D. Vertebrates

Which of the following fishes contained lungs?

A. Lamprey
B. Perch
C. Plaice
D. Dipnoi

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?

A. Polyps
B. Medusae
C. Both of these
D. None of these

In sponges fertilization takes place in____________?

A. Ectoderm
B. Mesenchyme
C. Endoderm
D. Uterus