SRM 5 Animal Classification

How many animal species are estimated to exist on Earth?

• Approximately 8.7 million

• About 5 million

• Nearly 15 million

• Roughly 10 million

What percentage of animal species are invertebrates?

• 95%

• 70%

• 85%

• 60%

What is the main difference between invertebrates and vertebrates?

• Invertebrates do not have a backbone; vertebrates do.

• Both invertebrates and vertebrates have a backbone.

• Invertebrates have a backbone; vertebrates do not.

• Invertebrates are larger than vertebrates.

Name one example of an animal from Phylum Porifera.

• starfish

• jellyfish

• bath sponge

• octopus

What type of environment do sponges primarily inhabit?

• Freshwater lakes

• Aquatic environments, primarily marine.

• Desert environments

• Terrestrial forests

What is a common characteristic of animals in Phylum Coelenterata?

• Bilateral symmetry and lack of specialized cells.

• Presence of exoskeleton and jointed limbs.

• Radial symmetry and presence of cnidocytes.

• Warm-blooded and capable of flight.

Give an example of an animal from Phylum Platyhelminthes.

• Starfish

• Planarian

• Jellyfish

• Octopus

What type of body structure do flatworms have?

• Flatworms have a flattened, acoelomate body structure.

• Flatworms have a cylindrical, coelomate body structure.

• Flatworms possess a segmented body structure.

• Flatworms have a rigid, exoskeletal body structure.

What is the digestive system like in Platyhelminthes?

• Platyhelminthes have a complex digestive system with multiple stomachs.

• The digestive system in Platyhelminthes is incomplete, with a mouth and gastrovascular cavity but no anus.

• The digestive system in Platyhelminthes is complete, with a mouth and anus.

• The digestive system in Platyhelminthes consists of a simple tube with an anus.

Which phylum includes jellyfish and sea anemones?

• Echinodermata

• Mollusca

• Arthropoda

• Cnidaria