17 Questions
What type of symmetry is found in many sponges, which lack a distinct head or body regions?
Asymmetric
Which of the following is a key feature associated with bilateral symmetry in animals?
Concentration of sensory organs and nerve tissues at the anterior end
Which type of animal body cavity is characterized by a space between the gut and body wall filled with cells called mesenchyme?
Acoelomate
What is the evolutionary advantage of cephalization, the concentration of sensory organs and nerve tissues at the anterior end?
It allows the animal to better sense and respond to its environment from the front
Which type of symmetry is found in ctenophores and cnidarians, where the body parts are arranged around a single main axis?
Radial symmetry
Which of the following is a key feature of the most evolutionarily advanced animal body plans?
Bilateral symmetry with cephalization
Which of the following is a characteristic of a diploblastic animal?
It has two cell layers: ectoderm and endoderm.
What is the defining characteristic of a protostome animal?
The blastopore develops into the mouth.
How do the early developmental patterns of sea urchins and lophotrochozoans differ?
Sea urchins have incomplete cleavage, while lophotrochozoans have spiral cleavage.
What is the relationship between the blastopore and the mouth in deuterostome animals?
The blastopore develops into the anus, and the mouth develops later.
Which of the following is a characteristic of the body plan of triploblastic animals?
They have three cell layers: ectoderm, endoderm, and mesoderm.
How do the early developmental patterns of reptiles and sea urchins differ?
Reptiles have incomplete cleavage, while sea urchins have radial cleavage.
What is the main difference between a pseudocoelomate and a coelomate body plan?
Control over movements of fluids in the body cavity in coelomates
How do body cavities act as hydrostatic skeletons in some animals?
By pushing fluid to another part of the cavity when muscles contract
What feature allows animals to precisely control their movements and alter body shape?
Possessing circular and longitudinal muscles
In the evolution of animal body plans, what does segmentation primarily facilitate?
Specialization of body regions
Which type of animals typically have jointed limbs specialized for controlled movements?
Arthropods and vertebrates
Test your knowledge on the basic developmental patterns that differentiate major animal groups. Learn about incomplete cleavage in reptiles, radial cleavage in sea urchins, spiral cleavage in lophotrochozoans, and distinct layers of cells forming in early development.
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