31. The process of shedding old skin or scales in fishes is called:
a) Molting
b) Shedding
c) Scaling
d) Ecdysis
Answer: c) Scaling
32. Which of the following is a type of shark known for its large dorsal fin?
a) Hammerhead shark
b) Nurse shark
c) Bull shark
d) Tiger shark
Answer: a) Hammerhead shark
33. Mollusks have a unique organ called a siphon, which is used for:
a) Reproduction
b) Excretion
c) Feeding
d) Water intake and outflow
Answer: d) Water intake and outflow
34. The function of the mantle in mollusks is to:
a) Protect the body
b) Regulate temperature
c) Secretion of the shell
d) Store food
Answer: c) Secretion of the shell
35. Which of the following is not a type of mollusk foot?
a) Tentacles
b) Crawling foot
c) Burying foot
d) Byssus
Answer: a) Tentacles
