Phylum Mollusca - Cephalopoda

Question 1

what does this class include?

Answer 1

squids,cuttle fishes,nautilus

Question 2

is radula present or absent?

Answer 2

present in the buccal cavity

Question 3

“a pair of horny beak like jaws are present” true or false

Answer 3

true

Question 4

shell is external and multi chambered in?

Answer 4

nautilus

Question 5

shell is internal in?

Answer 5

sepia and loligo

Question 6

shell is absent in?

Answer 6

octopus

Question 7

shell of sepia is known as?

Answer 7

cuttle bone

Question 8

shell of loligo is known as?

Answer 8

pen

Question 9

foot is modified into 8 arms in?

Answer 9

octopus

Question 10

foot is modified into 10 arms in?

Answer 10

sepia and loligo

Question 11

ctaenidia,atria and nephrida are 2 in?

Answer 11

dibranchiates (sepia)

Question 12

ctaenidia,atria and nephrida are 4 in?

Answer 12

tetrabranciates(nautilus)

Question 13

circulatory system is opened or closed?

Answer 13

closed

Question 14

is the nervous system well developed or not?

Answer 14

well developed with a brain enclosed in a cranium

Question 15

monoecious or dioecious?

Answer 15

dioecious

Question 16

is the development direct or indirect?

Answer 16

direct

Question 17

examples of organisms under this class?

Answer 17

architeuthes,sepia and nautilus

Question 18

what is the common name of architeuthes

Answer 18

giant squid

Question 19

what is the common name of sepia

Answer 19

cuttle fish

Question 20

octopus is also known as?

Answer 20

devil fish

Question 21

which is the largest invertebrate?

Answer 21

architeuthes/giant squid