Question 1

Which of the following best defines 'ecdysis' as it relates to Ecdysozoans?

Accepted Answer

The shedding or molting of the external cuticle to allow for growth.

Question 2

A preserved specimen has a cylindrical, unsegmented body, a complete digestive tract, and is tapered at both ends. Which phylum does it most likely belong to?

Accepted Answer

Phylum Nematoda

Question 3

Which anatomical feature distinguishes male from female roundworms (Phylum Nematoda) during dissection?

Accepted Answer

Males have a hooked posterior end and are smaller.

Question 4

A student observes an arthropod with two pairs of legs per body segment and a rounded body. What is the most likely identification?

Accepted Answer

Millipede (Subphylum Myriapoda)

Question 5

Which structure in crayfish is responsible for excreting nitrogenous wastes and maintaining osmoregulation?

Accepted Answer

Green gland

Question 6

During a crayfish dissection, a student identifies the cephalothorax. Which two body regions does this term combine?

Accepted Answer

Head and thorax

Question 7

Which of the following is a function of the Malpighian tubules in insects such as grasshoppers?

Accepted Answer

Excretion of metabolic wastes and osmoregulation

Question 8

A grasshopper is observed to have three distinct body regions. Which of the following correctly lists these regions?

Accepted Answer

Head, thorax, abdomen

Question 9

Which of the following best describes the type of metamorphosis undergone by grasshoppers?

Accepted Answer

Incomplete metamorphosis, with nymphs resembling adults

Question 10

Which structure in the crayfish is used primarily for capturing prey and defense?

Accepted Answer

Cheliped

Question 11

A student is examining a preserved arthropod with a carapace, compound eyes, and swimmerets. Which subphylum does this organism most likely belong to?

Accepted Answer

Subphylum Crustacea

Question 12

Which of the following structures is unique to female grasshoppers and is used for laying eggs?

Accepted Answer

Ovipositor

Question 13

Which of the following best describes the function of the gastric ceca in grasshoppers?

Accepted Answer

Secretion of digestive enzymes and absorption of nutrients

Question 14

Which of the following is a correct pairing of structure and function in crayfish?

Accepted Answer

Uropod – forms part of the tail fan for rapid backward movement

Question 15

Which of the following equations best represents the relationship between surface area ($$A) $$and volume ($$V) $$for a cylindrical nematode of length $$l$$ and radius $$r$$?

Accepted Answer

$$A = 2\pi r l$$, $$V = \pi r^2$ l$$

Question 16

Which structure in the grasshopper is responsible for detecting sound vibrations?

Accepted Answer

Tympanic membrane (tympanum)

Question 17

A scientist is studying gas exchange in insects. Which structure allows for direct oxygen delivery to tissues in grasshoppers?

Accepted Answer

Trachea

Question 18

Which of the following is a key difference between centipedes and millipedes?

Accepted Answer

Centipedes have one pair of legs per segment; millipedes have two.

Question 19

Which of the following best describes the function of the ostium in the crayfish heart?

Accepted Answer

Allows blood to enter the heart from the hemocoel

Question 20

A student observes a preserved arthropod with three pairs of walking legs, a pair of antennae, and wings. Which subphylum does this organism most likely belong to?

Accepted Answer

Subphylum Hexapoda

Bio Lab: Chap 30 Review

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