$\text{Plants} \rightarrow \text{Nematodes} \rightarrow \text{Predatory Insects}$

$\text{Egg} \rightarrow \text{Larva} \rightarrow \text{Pupa} \rightarrow \text{Adult}$

Question 1

Which of the following is a trait shared by both nematodes (Nematoda) and arthropods (Arthropoda), but not by annelids or mollusks?

Accepted Answer

Molting of a hard cuticle during growth (ecdysis)

Question 2

A nematode is found to have a pseudocoelom. Which statement best describes a pseudocoelom?

Accepted Answer

A body cavity partially lined with mesodermal tissue

Question 3

Which of the following best explains why arthropods are considered coelomates?

Accepted Answer

They have a body cavity completely lined with mesoderm

Question 4

Which equation best represents the flow of energy in a soil food web involving nematodes?

Accepted Answer

$	ext{Plants} ightarrow 	ext{Nematodes} ightarrow 	ext{Predatory Insects}$

Question 5

Which of the following is a major ecosystem service provided by nematodes?

Accepted Answer

Enhancing soil quality by consuming microorganisms and excreting nutrients

Question 6

A farmer notices reduced crop yield due to soybean cyst nematodes. Which strategy is most effective for reducing nematode infection?

Accepted Answer

Crop rotation and improving soil health

Question 7

Which of the following best describes the reproductive strategy of most nematodes?

Accepted Answer

Sexual reproduction, with some species capable of self-fertilization

Question 8

Which arthropod is responsible for transmitting Lyme disease to humans?

Accepted Answer

Tick

Question 9

Which of the following is a correct sequence for complete metamorphosis in arthropods?

Accepted Answer

$	ext{Egg} ightarrow 	ext{Larva} ightarrow 	ext{Pupa} ightarrow 	ext{Adult}$

Question 10

Which of the following is NOT a characteristic of ecdysozoans?

Accepted Answer

Radial cleavage in embryo

Question 11

A dog is diagnosed with heartworm. Which organism is responsible for this disease, and how is it transmitted?

Accepted Answer

Dirofilaria immitis, transmitted by mosquito bite

Question 12

Which of the following best explains the decline in arthropod abundance and species diversity?

Accepted Answer

Habitat loss and use of industrial chemicals such as pesticides

Question 13

Which of the following is a real-world example of nematodes functioning as biological control agents?

Accepted Answer

Nematodes consuming insects that harm agricultural crop plants

Question 14

Which of the following best describes the nutritional roles of arthropods in ecosystems?

Accepted Answer

Decomposers, primary consumers, secondary consumers, and animal ectoparasites

Question 15

Which of the following evolutionary patterns is observed in the Ecdysozoa clade?

Accepted Answer

Development of molting and a hard cuticle

Question 16

Which of the following is a direct impact of arthropods on human well-being?

Accepted Answer

Arthropods are major pollinators of crop plants

Question 17

Which of the following is a correct comparison between nematodes and arthropods?

Accepted Answer

Nematodes are unsegmented with no appendages, while arthropods have segmented bodies and jointed appendages

Question 18

Which of the following best describes the role of nematodes in enhancing crop plant production?

Accepted Answer

By consuming microorganisms and excreting nutrients that improve soil quality

Question 19

Which of the following is a disease caused by a nematode and acquired by consuming undercooked mammal meat?

Accepted Answer

Trichinosis

Question 20

Which of the following best explains why arthropods are important for maintaining plant species diversity?

Accepted Answer

They reduce primary consumer populations, act as pollinators, and excrete nutrients

Animals: Nematodes and Arthropods (Ecdysozoa) – Structure, Function, and Importance

Study Guide - Practice Questions