Question 1

Which anatomical structure in the crayfish is primarily responsible for locomotion and is labeled in the image as 'walking legs'?

Accepted Answer

Walking legs

Question 2

In the context of crayfish anatomy, what is the function of the telson, as labeled in the image?

Accepted Answer

Assisting in rapid backward movement

Question 3

Which taxonomic group do crayfish belong to, based on their anatomical features such as a carapace and walking legs?

Accepted Answer

Ecdysozoa

Question 4

The symbol shown in the second image is used to denote which biological sex?

Accepted Answer

Male

Question 5

In the squid dissection image (third image), which organ is most likely being highlighted in the center of the body?

Accepted Answer

Gonad

Question 6

Which reproductive structure would you expect to find in the male squid, as indicated by the male symbol in the fourth image?

Accepted Answer

Testis

Question 7

In the labeled squid dissection (fifth image), which structure is responsible for producing eggs?

Accepted Answer

Ovary

Question 8

The symbol in the sixth image is used to represent which sex in biological diagrams?

Accepted Answer

Female

Question 9

Which of the following best describes the function of the siphon in squid anatomy, as seen in the labeled dissection image?

Accepted Answer

Locomotion via jet propulsion

Question 10

If a biologist is comparing the reproductive anatomy of male and female squids, which structure would be present only in the female, as shown in the labeled image?

Accepted Answer

Nidamental gland

Question 11

Which of the following equations best represents the relationship between the number of walking legs ($$W$$), claws ($$C$$), and total appendages ($$A) in a $$crayfish, if $$A = W + C + 6 ($$where 6 represents other appendages)?

Accepted Answer

$$A = W + C + 6$$

Question 12

Which anatomical feature distinguishes members of Insecta from other closely related Ecdysozoans such as crayfish?

Accepted Answer

Three pairs of walking legs

Question 13

Which structure in the crayfish is analogous to the mantle in the squid, in terms of protecting internal organs?

Accepted Answer

Carapace

Question 14

A student observes a squid with a large, granular organ near the posterior end, labeled as the nidamental gland. What is the primary function of this organ?

Accepted Answer

Egg case secretion

Question 15

Which of the following best describes the evolutionary relationship between crayfish and squid?

Accepted Answer

Both are protostomes but belong to different major groups

Animal Diversity and Dissection Study Guide: Opisthokonta, Fungi, Lophotrochozoa, Ecdysozoa, and Deuterostomia

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