General Science: Biology Quiz (Animal Kingdom)

Instructions:

1. This quiz contains 20 multiple-choice questions.
2. Select the most appropriate option for each question.
3. After selecting an option, click on "NEXT" to move to the next question.
4. Once you have completed the test, you will see your score and can review your answers.

Result:

1/20

Which level of organization is exhibited by sponges?

Tissue level

Organ level

Organ system level

Cellular level

Sponges exhibit the cellular level of organization, where cells are loosely aggregated and perform some division of labor. Unlike higher animals, they do not form tissues or organs.

2/20

What type of symmetry is found in coelenterates?

Asymmetrical

Radial symmetry

Bilateral symmetry

No symmetry

Coelenterates, such as jellyfish and corals, exhibit radial symmetry, where any plane passing through the central axis divides the organism into identical halves. This symmetry is typical for organisms that have a central axis.

3/20

Which type of coelom do annelids possess?

Acoelomate

Pseudocoelomate

Coelomate

Haemocoelomate

Annelids possess a true coelom, which is a body cavity completely lined with mesoderm. This allows for greater complexity in the development of organ systems compared to acoelomates or pseudocoelomates.

4/20

What is the function of cnidoblasts in cnidarians?

Anchorage, defense, and prey capture

Reproduction

Locomotion

Respiration

Cnidoblasts are specialized cells in cnidarians that contain stinging capsules called nematocysts. They are used for anchoring the organism, defending against predators, and capturing prey.

5/20

Which phylum includes animals commonly known as comb jellies?

Cnidaria

Porifera

Platyhelminthes

Ctenophora

Ctenophora, also known as comb jellies, are marine animals characterized by their radially symmetrical, diploblastic bodies and rows of ciliated comb plates used for locomotion.

6/20

What type of digestive system is found in Platyhelminthes?

Complete

Incomplete

No digestive system

Complex

Platyhelminthes have an incomplete digestive system with only one opening that serves as both mouth and anus. This simple structure limits the efficiency of digestion compared to organisms with complete digestive systems.

7/20

Which of the following is a characteristic of echinoderms?

Radial symmetry in adults

Bilateral symmetry in adults

Presence of a notochord

Metameric segmentation

Echinoderms exhibit radial symmetry in their adult form, which allows for equal distribution of sensory and feeding structures around a central axis. This is different from their larval stage, which shows bilateral symmetry.

8/20

What is the primary role of choanocytes in sponges?

Reproduction

Locomotion

Water circulation and food capture

Defense

Choanocytes, or collar cells, line the spongocoel and canals of sponges. They have a flagellum that creates water currents, allowing the sponge to filter feed by capturing food particles from the water.

9/20

Which type of skeleton supports the body of a sponge?

Bony skeleton

Spicules or spongin fibers

Cartilaginous skeleton

Chitinous exoskeleton

Sponges have a skeletal structure made up of spicules or spongin fibers. Spicules are made of calcium carbonate or silica, while spongin fibers are composed of a collagen-like protein, providing structural support to the sponge.

10/20

Which phylum is characterized by the presence of a water transport system?

Cnidaria

Annelida

Porifera

Platyhelminthes

Porifera, or sponges, possess a unique water transport or canal system. Water enters through pores called ostia, flows into a central cavity called the spongocoel, and exits through an opening called the osculum. This system aids in feeding, respiration, and excretion.

11/20

What is a unique feature of bioluminescence in ctenophores?

Defense mechanism

Camouflage

Emission of light

Temperature regulation

Bioluminescence, the ability to emit light, is a distinctive feature of ctenophores. This ability helps them attract prey, deter predators, and communicate with other ctenophores in the dark ocean environment.

12/20

Which of the following is not a characteristic of arthropods?

Exoskeleton

Jointed appendages

Closed circulatory system

Segmented body

Arthropods possess an open circulatory system where the blood flows freely within body cavities, unlike a closed circulatory system where the blood is contained within vessels. This open system is less efficient but suitable for their size and activity level.

13/20

Which class of mollusks includes octopuses and squids?

Gastropoda

Cephalopoda

Bivalvia

Polyplacophora

Cephalopoda is a class of mollusks that includes octopuses, squids, and cuttlefish. These animals are known for their advanced nervous system, complex behavior, and ability to change color and texture for communication and camouflage.

14/20

What type of body cavity is present in nematodes?

Acoelomate

Pseudocoelomate

Coelomate

Haemocoelomate

Nematodes, or roundworms, have a pseudocoelom, which is a body cavity not fully lined by mesodermal tissue. This pseudocoelom acts as a hydrostatic skeleton, providing support and allowing for the distribution of nutrients and waste products.

15/20

Which of the following is a characteristic feature of chordates?

Radial symmetry

Exoskeleton

Open circulatory system

Presence of a notochord

Chordates are defined by the presence of a notochord, a flexible rod-like structure that provides support during embryonic development. In many chordates, this notochord is replaced by a vertebral column during adulthood.

16/20

What is the main function of nephridia in annelids?

Respiration

Excretion

Reproduction

Digestion

Nephridia are excretory organs found in annelids that function similarly to kidneys. They remove metabolic waste from the body, maintaining osmotic balance and contributing to the overall homeostasis of the organism.

17/20

Which of the following structures is unique to echinoderms?

Notochord

Water vascular system

Exoskeleton

Segmented body

Echinoderms possess a unique water vascular system, a network of hydraulic canals used for locomotion, feeding, and respiration. This system operates the tube feet, which are used for movement and capturing food.

18/20

What is the primary function of flame cells in flatworms?

Excretion and osmoregulation

Reproduction

Digestion

Circulation

Flame cells, also known as protonephridia, are specialized excretory cells in flatworms. They function in osmoregulation and waste removal, helping maintain the organism's internal environment by regulating the flow of water and excreting waste products.

19/20

Which type of body plan do mollusks exhibit?

Radial symmetry

Bilateral symmetry

Mantle, visceral mass, and foot

Segmented body

Mollusks exhibit a body plan that includes a mantle, visceral mass, and foot. The mantle secretes the shell in many species, the visceral mass contains the internal organs, and the foot is used for locomotion.

20/20

Which feature is characteristic of arachnids?

Eight legs

Wings

Antennae

Three body segments

Arachnids, such as spiders and scorpions, are characterized by having eight legs. They lack antennae and wings, distinguishing them from insects, which typically have six legs and may have wings and antennae.

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