Question

1) Ray-finned fish belong to the group

a. urochordata

b. cephalochordata

c. dipnoi

d. mixini

e.actinopterygli

2) Which of the following has true (bony) teeth?

a. lamprey

b. chondrichtyes

c. lancelet

d. all of the above

e. B and C only

3) The presence of lead in the environment almost drive the California condor to extinction

true or false

4)__ is a derived lineage of extant amphibians that lost limbs

a. anurans

b. caudata

c. limblessia

d. diptera

e. apods

5) which one of the following organisms does not belong in the monophyletic group that includes the other four?

a. shark

b. frog

c.snake

d.turnicate

e. human

6)all of the following are synapomorphies of chordata except

a. notochord

b. dorsal hollow nerve chord

c. port-anal tail

d. vertebrae

e. pharyngeal gill slits

7) before the mid-blastula transition, the size of a frog embryo decreases with each round of mitosis

true or false

8) fish produce ____ as their nitrogenous waste product

a. ammonia

b. urea

c. uric acid

d. all of the above

e. none of the above

9) the first rounds of cellular cleavage in an early vertebrae embryo are controlled by maternal genes.

true or false

Answer 1

Ans :-1) option E. Actinopterygii

Ray finned fish are largest group of living fish.

Ans :-2) option A. Lamprey

Lamprey mouth contains 11 or 12 rows of teeth, arranged in concentric circles enclosed by oral hood. But these teeth of lamprey are not identical with true teeth of other vertebrae. They are hollow, stratified or sheath covering axial papilla of dermis.

Chondrichtyes lack true bone and their skeleton is made up of cartilage. Only their teeth are calcified.

Lancelet have no fins, long eel like body, round mouth, and have no jaws.

Ans :-3) True

California condor are scavengers. They don't kill their own food but consume dead animals remains.

During 20th century California condor number declined rapidly due to poaching, lead poisioning and habitat destruction.

They got lead poisioning because as these are obligate scavengers and they are believed to ingest lead ammunition fragments embedded within carcasses of animal shot with lead ammunition.

Ans :-4) option E. Apods

Apods are group of limbless amphibians.

Diptera is large order containing many of insect species.

Caudata is order of amphibians. It is also called urodela. It includes newt and salmander.

Anurans are tailless amphibian.

Ans :-5) option D. Tunicates

Tunicate is marine invertebrate animal while shark, frog, snake and humans are vertebrate.

Ans :-6) option D. Vertebrae

Animals in phylum chordata share 4 common characteristics. These are:-a notochord, a dorsal hollow nerve cord, pharyngeal gill slits, a post anal tail.