Class Bivalvia (Phylum Mollusca)

Question 1

Sedentary or motile?

Answer 1

Mostly sedentary

Question 2

Type of feeders

Answer 2

suspension feeders – draws nutrients from surrounding water

Question 3

Movement of Suspension Feeding

Answer 3

• Movement of water → incurrent aperture → mantle cavity → gills (CO2/O2 & nitrogenous waste → suprabranchial chamber → excurrent aperture
  
  • for food → …gills → (through cilia) to mouth & labial palps → esophagus → stomach → intestine w/ crystalline style (spin mucuous around, increase SA which increases ability for enzymes to work) → rectum → anus
• the gills are covered in sheet of mucous so food is caught on it → mouth (labial palps help get mucous in)

Question 4

Life Cycle

Answer 4

Question 5

Common organisms

Answer 5

e.g. clams, oysters, scallops