Invertebrates

Front

What is a choanocyte?

Back

A choanocyte is a specialized cell found in sponges that is responsible for feeding and water circulation. It has a flagellum surrounded by a collar of microvilli that traps food particles from the water.

Front

What is the main difference between nematodes and arthropods regarding their circulatory systems?

Back

Nematodes do not have a circulatory system, while arthropods have an open circulatory system.

Front

Which group of organisms has flagella associated with its method of feeding?

Back

Sponges have flagella that help in feeding by creating water currents to trap food particles.

Front

What is the significance of the Lochotrophozora group in evolutionary biology?

Back

Lochotrophozora represents a change in understanding evolutionary relationships among animals, as phylogenies based on both morphological and molecular data revealed new insights.

Front

What does the presence of a lophophore in an organism suggest?

Back

The presence of a lophophore suggests that the organism feeds by trapping food particles suspended in the water.

Front

Define invertebrates.

Back

Invertebrates are animals that lack a backbone or vertebral column. They include a diverse range of organisms such as sponges, cnidarians, mollusks, and arthropods.

Front

What are the main characteristics of sponges?

Back

Sponges are simple, multicellular organisms that lack true tissues and organs. They have a porous body structure and rely on water flow for feeding, respiration, and waste removal.

Front

What is the role of amoebocytes in sponges?

Back

Amoebocytes are versatile cells in sponges that perform various functions, including nutrient transport, waste removal, and the production of skeletal elements.

Front

What distinguishes cnidarians from other invertebrates?

Back

Cnidarians are characterized by the presence of cnidocytes, specialized cells that contain stinging structures called nematocysts, used for capturing prey and defense.

Front

What is the function of the exoskeleton in arthropods?

Back

The exoskeleton provides structural support, protection from predators, and prevents water loss in arthropods.