Invertebrates 4

Question 1

Description

Answer 1

Mollusks comprise gastropods, bivalves, and cephalopods. They possess an open circulatory system and a mantle responsible for secreting shells.

Question 2

Key Features

Answer 2

Most species exhibit separate sexes, though some are hermaphroditic. Gastropods, such as snails, use a muscular foot for locomotion and a radula for feeding. Bivalves, like clams, filter feed and have a muscular foot for burrowing. Cephalopods, such as octopuses, are predators with large brains and complex sensory organs.

Question 3

Ecological Importance

Answer 3

Mollusks play vital roles in ecosystems as filter feeders, predators, and prey. They also serve as bioindicators of environmental health.

Question 4

Reproduction

Answer 4

Mollusks reproduce sexually, with most species exhibiting separate sexes. Some species are hermaphroditic, facilitating efficient reproduction.