Porifera
Nematod
Phylum Arthropoda
Mollusca
100

What are poriferans?

Simple animals with holes all over their bodies.

100

What are nematodes?

Small, round worms with smooth bodies.

100

What are the main characteristics that distinguish arthropods from other invertebrates?

  1. Segmented body, exoskeleton, jointed limbs, bilateral symmetry.

100

What kind of body do mollusks have?

Soft bodies, often with a head, foot, and body mass.

200

Where do poriferans live?

In oceans and sometimes in fresh water.

200

Where do nematodes live?

In soil, water, and inside other animals.

200

How is the body of an arthropod typically segmented, and what are the functions of these segments?

Head (senses), thorax (movement), abdomen (digestion/reproduction).

200

Where do most mollusks live?

Most live in water, especially in oceans.

300

Do poriferans have organs or a brain?

No, they don’t have organs, a brain, or nerves.

300

Do nematodes have a segmented body?I

No, their bodies are not segmented.

300

How do arthropods grow, and what role does molting (ecdysis) play in their development?

They molt to grow by shedding the old exoskeleton.

300

What are some common examples of mollusks?

Snails, clams, squids, and octopuses.

400

How do poriferans eat?

They filter tiny food from water that flows through their bodies.

400

How do nematodes eat?

They have a mouth and a simple digestive system.

400

What types of respiratory systems are found in arthropods, and how do they vary between aquatic and terrestrial species?

Aquatic use gills; land species use tracheae or book lungs

400

How do mollusks move around?

They use a foot to crawl, burrow, or swim.

500

Can poriferans move?

No, they stay in one place.

500

Can nematodes be harmful?

Yes, some cause diseases in plants, animals, and people.

500

What makes arthropods different from other animals without backbones?

They have hard outer shells, jointed legs, and bodies divided into parts.

500

Do all mollusks have shells?

No, some have shells (like clams), but others don’t (like octopuses)