Biodiversity of Animals

Due to a constant fresh supply of water filtering through the spongocoel, sponges do not need a circulatory system because diffusion allows for a continuous exchange of water, nutrients and waste between themselves and their aquatic environment.

• True

• False

A unique characteristic of Arthropods is their thick, waterproof, hardened exoskeleton made of _______

In phylum Chordata, all organisms belonging to this phylum will comprise a nerve cord found towards which side of the organism?

• dorsal

• • ventral

• • inferior

• • anterior

Volume refers to the amount of space matter can occupy inside an object. For example, the amount of space we have inside our bodies to fit in all of its contents. 

• True

• False

The surface-area-to-volume ratio decreases as a cell or organism ________ in size.

For an organism with a volume of 24 cm³ and a surface area of 96 cm², what will its surface area-to-volume ratio be?

• 4

• • 0.25

• • 0.5

• • 6

Invertebrates only have negative effects on agriculture and ecosystems.

• False

• True

Many invertebrates play an essential part as ________________ in ecosystems. For example, the free-living worms of the Platyhelminthes and Annelids are mostly animals that feed on dead and decaying organic matter.

Which of the following are invertebrates that have negative effects on agriculture and ecosystems?

• Aphids

• Bees

• Termites

• Earthworms

Which of the following is the phylum with no symmetry?

• Porifera

• Cnidaria

• Platyhelminthes

• Annelida