$$\text{Zygote} \rightarrow \text{Blastula} \rightarrow \text{Gastrula}$$

Question 1

Which of the following is NOT a major characteristic of animals?

Accepted Answer

They have cell walls.

Question 2

During the Cambrian Period, animal diversity increased rapidly. Which of the following was NOT a major factor contributing to this increase?

Accepted Answer

Emergence of photosynthetic animals.

Question 3

Which statement best explains why bilateral symmetry allowed for more active lifestyles in animals?

Accepted Answer

It enabled the development of a head region (cephalization) for sensory processing.

Question 4

Which embryonic tissue layer gives rise to muscles and most internal organs (excluding the digestive tract)?

Accepted Answer

Mesoderm

Question 5

Which of the following correctly describes the fate of the blastopore in protostome development?

Accepted Answer

The blastopore develops into the mouth.

Question 6

Which of the following animals is diploblastic?

Accepted Answer

Cnidarian (e.g., jellyfish)

Question 7

Which type of cleavage is associated with indeterminate cell fate and the possibility of identical twins?

Accepted Answer

Radial cleavage

Question 8

A triploblastic animal with a body cavity completely lined by mesoderm is called a:

Accepted Answer

Coelomate

Question 9

Which of the following is TRUE about the animal gametic life cycle?

Accepted Answer

Animals are diploid except for the gamete phase.

Question 10

Which of the following statements about Hox genes is CORRECT?

Accepted Answer

Hox genes regulate the development of body form and segments.

Question 11

Which of the following is a defining feature of Ecdysozoa?

Accepted Answer

Presence of a non-living cuticle and molting (ecdysis)

Question 12

Which of the following best describes a pseudocoelomate animal?

Accepted Answer

It has a body cavity between the mesoderm and endoderm.

Question 13

Which of the following is NOT a method used in modern animal classification?

Accepted Answer

Ability to photosynthesize

Question 14

Which of the following statements about animal phylogeny is TRUE?

Accepted Answer

The animal kingdom is monophyletic, with a common ancestor similar to choanoflagellates.

Question 15

Which of the following is a real-world example of a triploblastic, coelomate animal?

Accepted Answer

Earthworm

Question 16

Which of the following is a correct sequence of embryonic development in animals?

Accepted Answer

$$	ext{Zygote} ightarrow 	ext{Blastula} ightarrow 	ext{Gastrula}$$

Question 17

Which of the following terms describes the development of a head region in animals?

Accepted Answer

Cephalization

Question 18

Which of the following statements about tissue organization in animals is CORRECT?

Accepted Answer

Sponges lack specialized tissues and organs.

Question 19

Which of the following is a feature unique to animals and not found in other kingdoms?

Accepted Answer

Blastula stage during development

Question 20

Which of the following statements about segmentation in animals is TRUE?

Accepted Answer

Segmentation is traced to changes in Hox genes.

Animal Diversity: Structure, Development, and Classification

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