The first group to exhibit an amniotic egg was the a. cartilaginous fish b. amphibians c. reptiles d. bony fish e. mammals

The first group to exhibit an amniotic egg was the

a. cartilaginous fish

b. amphibians

c. reptiles

d. bony fish

e. mammals

Ans: reptiles

Which feature do mammals share in common with all vertebrates? a. hair b. a column of individual backbones c. milk production d. internal development e. internal fertilization

Which feature do mammals share in common with all vertebrates?

a.   hair

b.   a column of individual backbones

c.   milk production

d.   internal development

e.   internal fertilization

Ans:  a column of individual backbones 

Birds differ from more primitive vertebrates by a. their lack of scales b. the land egg c. the ability to maintain a constant body temperature d. the ability to fertilize eggs internally

Birds differ from more primitive vertebrates by

a.   their lack of scales

b.   the land egg

c.   the ability to maintain a constant body temperature

d.   the ability to fertilize eggs internally

e.   their possession of a dorsal nerve cord

Ans:  the ability to maintain a constant body temperature

An organism that possesses feathers must also possess a. malpighian tubules b. a three-chambered heart c. a dorsal nerve cord d. a pseudocoelom e. replaceable teeth

An organism that possesses feathers must also possess

a.   malpighian tubules

b.   a three-chambered heart

c.   a dorsal nerve cord

d.   a pseudocoelom

e.   replaceable teeth

Ans:   a dorsal nerve cord 

Which existing reptile group is most closely related to birds? a. crocodilians b. lizards c. snakes d. tuataras e. turtles

Which existing reptile group is most closely related to birds?

a.   crocodilians

b.   lizards

c.   snakes

d.   tuataras

e.   turtles

Ans:  crocodilians 

The immediate ancestors of snakes were the a. amphibians b. birds c. crocodilians d. lizards e. tuataras

The immediate ancestors of snakes were the

a.   amphibians

b.   birds

c.   crocodilians

d.   lizards

e.   tuataras

Ans:  lizards

Which of the following statements is false? a. Lizards are a very small component of the present-day reptiles. b. Lizards gave rise to the snakes. c. Lizards are primarily predators. d. Lizards can break off their tails to serve as a distraction to predators. e. None of the choices.

Which of the following statements is false?

a.   Lizards are a very small component of the present-day reptiles.

b.   Lizards gave rise to the snakes.

c.   Lizards are primarily predators.

d.   Lizards can break off their tails to serve as a distraction to predators.

e.   None of the choices.

Ans:   Lizards are a very small component of the present-day reptiles.

The mass extinction at the end of the Cretaceous was probably caused by a/an a. asteroid b. earthquake c. ice age d. volcanic eruption e. none of the choices

The mass extinction at the end of the Cretaceous was probably caused by a/an

a.   asteroid

b.   earthquake

c.   ice age

d.   volcanic eruption

e.   none of the choices

Ans:   asteroid

Which of the following is most responsible for freeing vertebrates from dependence on watery habitats? a. lungs b. paired appendages c. shelled, amniote eggs d. a four-chambered heart e. fur

Which of the following is most responsible for freeing vertebrates from dependence on watery habitats?

a. lungs

b. paired appendages

c. shelled, amniote eggs

d. a four-chambered heart

e. fur

Ans: shelled, amniote eggs

Amphibians can use which of the following for gas exchange? a. gills b. lungs c. skin d. gills and lungs e. all of the choices

Amphibians can use which of the following for gas exchange?

a. gills

b. lungs

c. skin

d. gills and lungs

e. all of the choices

Ans:

all of the choices

Amphibians are distinguished from earlier vertebrates by a. the development of eggs capable of hatching on land b. metamorphosis c. the development of limbs capable of moving on land d. the presence of scales to prevent desiccation e. absence of gills in any stage of development

Amphibians are distinguished from earlier vertebrates by

a. the development of eggs capable of hatching on land

b. metamorphosis

c. the development of limbs capable of moving on land

d. the presence of scales to prevent desiccation

e. absence of gills in any stage of development

Ans:

the development of limbs capable of moving on lan

Amphibians are most dependent on an aquatic environment for a. respiration b. feeding c. reproduction d. urination e. defecation

Amphibians are most dependent on an aquatic environment for

a. respiration

b. feeding

c. reproduction

d. urination

e. defecation

Ans: reproduction

Amphibians most likely evolved from a. lobe-finned fish b. ray-finned fish c. reptiles d. lawless fish e. placoderms

Amphibians most likely evolved from

a. lobe-finned fish

b. ray-finned fish

c. reptiles

d. lawless fish

e. placoderms

Ans: lobe-finned fish

All but which of the following have cartilaginous skeletons? a. sharks b. lampreys c. perch d. rays e. both perch and rays

All but which of the following have cartilaginous skeletons?

a. sharks

b. lampreys

c. perch

d. rays

e. both perch and rays

Ans: perch

The vertebrate lung first appeared in which organism? a. fishes b. amphibians c. reptiles d. birds e. mammals

The vertebrate lung first appeared in which organism?

a. fishes

b. amphibians

c. reptiles

d. birds

e. mammals

Ans: fishes

In true fishes, the gills primarily serve which function? a. gas exchange b. feeding c. water elimination d. both feeding and gas exchange e. all of the choices

In true fishes, the gills primarily serve which function?

a. gas exchange

b. feeding

c. water elimination

d. both feeding and gas exchange

e. all of the choices

Ans: gas exchange

Sharks, rays, and skates belong to what group? a. birds b. amphibians c. cartilaginous fish d. bony fish e. reptiles

Sharks, rays, and skates belong to what group?

a. birds

b. amphibians

c. cartilaginous fish

d. bony fish

e. reptiles

Ans: cartilaginous fish

Sharks differ from most other fish in that they lack a. lungs b. scales c. bone d. paired appendages e. fins

Sharks differ from most other fish in that they lack

a. lungs

b. scales

c. bone

d. paired appendages

e. fins

Ans: bone

The term jawless fish could be used to describe a. ostracoderms b. placoderms c. hagfish d. ostracoderms and hagfish e. placoderms and hagfish

The term jawless fish could be used to describe

a. ostracoderms

b. placoderms

c. hagfish

d. ostracoderms and hagfish

e. placoderms and hagfish

Ans: ostracoderms and hagfish

The feeding habits of lampreys are best described as a. suspension feeding b. predatory c. parasitic d. scavenging e. all of the choices Ans:parasitic

The feeding habits of lampreys are best described as

a. suspension feeding

b. predatory

c. parasitic

d. scavenging

e. all of the choices

Ans:

parasitic

step by step balancing of redox reaction KClO3+H2SO4 --KHSO4+HClO4+ClO2+H2O ionic equation :- ClO3^-1 ---------- Clo4^-1 + ClO2

step by step balancing of  redox reaction

KClO3+H2SO4  -->KHSO4+HClO4+ClO2+H2O

ionic equation :-

ClO3^-1  ----------> Clo4^-1 + ClO2

oxidation reaction :- 

oxidation number of Cl in Clo3^-1  is +5 and oxidation  number of Clorine in Clo4^-1 is +7 

here oxidation number of clorine is increasing so its a oxidation reaction 

ClO3^-1  -----> ClO4^-1  

Balance the oxidation reaction by adding the electron 

ClO3^-1  -----> ClO4^-1 + 2e^-1  -------------(1)

(oxidation number of clorine is changing + 5 to + 7 so add 2 electron there to balance the reaction )

reduction reaction :-

oxidation number of Clrine in ClO3^-1 is +5 and in ClO2 oxidation number is +4, oxidation number is decreasing  hence this is 

a reduction reaction 

ClO3^-1 ------> ClO2 

ClO3^-1 + e^-1 -------> ClO2     -------------(2)

(oxidation number of clorine is changing + 5 to + 4 so add 1 electron there to balance the reaction )

multiply by 2 in second equation to make same number of electron in both equation first and second 

2ClO3^-1 + 2e^-1 -------> 2ClO2  -------------(3)

add equation first and third we get 

ClO3^-1 + 2ClO3^-1 + 2e^-1  ----------> Clo4^-1 + 2ClO2  + 2e^-1

calcel out the electron we get 

ClO3^-1 + 2ClO3^-1 ----------> Clo4^-1 + 2ClO2 

H2SO4 is an acid and in acidic redox reaction we always balance the reaction using H+ ions

So balance the charge using H+ ions 

ClO3^-1 + 2ClO3^-1 + 2H+ ----------> Clo4^-1 + 2ClO2 

now Add H2O to balance the complete reaction 

ClO3^-1 + 2ClO3^-1 + 2H+ ----------> Clo4^-1 + 2ClO2 + H2O

Answer :-

               3ClO3^-1 + 2H+ ----------> Clo4^-1 + 2ClO2 + H2O