Cnidaria

Which of the following is a characteristic feature of organisms in the phylum Cnidaria?

• Presence of a segmented body

• Presence of stinging cells (cnidocytes)

• Presence of a hard exoskeleton

• Presence of a water vascular system

Tags

NGSS.MS-LS4-2

What is the primary function of cnidocytes in Cnidarians?

• Respiration

• Digestion

• Defense and capturing prey

• Reproduction

Tags

NGSS.MS-LS1-4

What characteristic is shared by organisms with biradial symmetry?

• Differentiation of dorsal and ventral surfaces

• Similarity to bilateral symmetry

• 360° sensory information

• Ability to move in a straight line

What is the function of the mesoglea in jellyfish?

• Provides structural support and fills the jellyfish with a jelly-like substance

• Helps in digestion of food

• Facilitates movement of the tentacles

• Acts as the main organ for respiration

What do organisms with a gastrovascular cavity feed on?

• Large mammals and birds

• Small crustaceans and fish

• Plants and algae

• Insects and worms

Which of the following processes occur in the gastrovascular cavity?

• Digestion, gas exchange, waste exchange, and gamete discharge

• Only digestion and waste exchange

• Only gas exchange and gamete discharge

• Only digestion

What is the role of nematocysts in the process of catching and digesting food?

• They secrete enzymes to digest food.

• They entangle and paralyze prey.

• They engulf food into vacuoles.

• They draw food into the mouth.

Which substances are responsible for digesting food in the process described?

• Nematocysts and vacuoles.

• Tentacles and mucus.

• Mucus and enzymes.

• Cells and nematocysts.

What role do contractile muscle cells play in the hydrostatic skeleton?

• They provide structural support.

• They squeeze the water-filled gastrovascular cavity to propel the body.

• They help in digestion.

• They produce energy for the organism.

Which type of organism typically has a nerve net as part of its nervous system?

• Cnidarians

• Worms

• Sponges

• Reptiles