Lab Practical #1

Question 1

Sponge

Answer 1

central cavity; water channel

Question 2

Hydra

Answer 2

• gastrovascular cavity; digestion, absorption of nutrients, gas exchange
• ectoderm; outer layer, protection
• endoderm; inner layer, secretes digestive enzymes

Question 3

Planarians

Answer 3

• brain; communication and support

- spinal cord; communication and support

Question 4

Ascaris

Answer 4

• body cavity; suspends organs
• reproductive organs; reproduction
• digestive tract; mouth to anus

Question 5

Earthworm

Answer 5

• blood vessel; pumps blood
• intestine; digestion
• brain; communication

Question 6

Clams

Answer 6

• heart; pumps blood
• gills; gas exchange
• nephridia; filter, green, kidney-like

Question 7

Crayfish

Answer 7

• gills; exchange gas
• heart; pumps blood
• intestine; digestion
• green glands; excretory organs
• ventral nerve cord; communication

Question 8

Grasshopper

Answer 8

• spiracles; black dots on exoskeleton, openings for respiration
• trachea; respiratory system

Question 9

Lancelet

Answer 9

• nerve cord; communication
• notochord; support
• pharynx with gill slits; water and food pass through via the mouth