Quiz #2: Lower Invertebrates

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| By Wnurainie

Wnurainie

Community Contributor

Quizzes Created: 3 | Total Attempts: 931

Questions: 15 | Attempts: 553 | Updated: Mar 21, 2023

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This quiz covers LU2: Lower invertebrates (Phylum Ctenophora - Annelida)

Questions and Answers

1.

Ctenophores posess eight comb rows composed of long, fused ______.

Explanation
Ctenophores are marine animals that possess eight comb rows composed of long, fused cilia. Cilia are hair-like structures that extend from the surface of cells and are involved in various functions such as locomotion and capturing food. In the case of ctenophores, the fused cilia in their comb rows help them move through the water by beating in a coordinated manner, creating a shimmering effect. This allows them to swim and navigate their environment efficiently.

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2.

Ctenophores do not possess nematocysts, instead they have adhesive prey capturing cells called _________.

Explanation
Each colloblast cell consists of bulbous, sticky head connected to a long, straight filament and a spiral, contractile filament.

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3.

In Ctenophores, what are used for locomotion?
- A.
  
  Ctene
- B.
  
  Costae
- C.
  
  Apical sense
- D.
  
  Pharynx
Correct Answer
B. Costae

Explanation
The body of ctenophores has ctene which is organized into 8 comb rows. These comb rows = costae stretch from oral to aboral surface and the function is for locomotion.

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4.

The free-living platyhelminths are usually considered the most primitive bilateral animals and the 1^st group to have evolved a true ______________.

Correct Answer
mesoderm

Explanation
It is believed that all coelomate animals may evolved from flatworm-like ancestors.

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5.

Flatworms osmoregulates through a specialized organ called __________.
- A.
  
  Syncytial layer
- B.
  
  Microvillus
- C.
  
  Tegument
- D.
  
  Protonephridia
Correct Answer
D. Protonephridia

Explanation
Protonephridia (first kidney) is a specialized organ in flatworms osmoregulation and it also helps eliminating other matabolic wastes such as ammonia, urea and amino acid.

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6.

Light-sensitive sense organs in the flatworms are called ______.
- A.
  
  Rheoreceptors
- B.
  
  Ocelli
- C.
  
  Scolex
- D.
  
  Proglottids
Correct Answer
B. Ocelli

Explanation
Ocelli are light-sensitive sense organs found in flatworms. They are simple eyes that can detect changes in light intensity and direction. These organs help flatworms to navigate their environment and respond to light stimuli. Ocelli are not as complex as the eyes of higher organisms, but they still play a crucial role in the sensory perception of flatworms.

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7.

The human liver fluke, Clonorchis sinensis, is common in China, and can cause cirrhosis of the liver and death.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because the human liver fluke, Clonorchis sinensis, is indeed common in China and can cause cirrhosis of the liver and death. This parasite infects the liver and bile ducts of humans, leading to inflammation, scarring, and eventually liver damage. If left untreated, it can result in severe complications such as liver cancer and even death. Therefore, the statement is accurate.

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8.

Members in the Phylum Nematoda possess a pair of lateral sensory organs called _______.

Correct Answer
amphids
amphid

Explanation
Members in the Phylum Nematoda possess a pair of lateral sensory organs called amphids. Amphids are specialized structures found in nematodes that are responsible for detecting chemical cues in the environment. They play a crucial role in the nematode's ability to sense and respond to their surroundings.

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9.

Most nematodes are _______. Males are smaller than females and may have an accessory _______ structure.
- A.
  
  Monoceious; amoeboid
- B.
  
  Asexual; amoeboid
- C.
  
  Dioecious; copulatory
- D.
  
  Hermaphroditic; copulatory
Correct Answer
C. Dioecious; copulatory

Explanation
Most of members in Phylum Nematoda are dioecious with amoeboid sperm, and males are smaller than females and have a bent tail for holding female for copulation.

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10.

Which is NOT TRUE about the cuticle functions in nematodes?
- A.
  
  As a hook to burrow into muscle tissue forming cysts for parasitic nematodes.
- B.
  
  As a barrier and provides protection.
- C.
  
  As a sensory array where it can detects changes in the environment.
- D.
  
  As a hydrostatic skeleton to help in locomotion.
Correct Answer
A. As a hook to burrow into muscle tissue forming cysts for parasitic nematodes.

Explanation
The cuticle in nematodes serves several functions, including acting as a barrier and providing protection, functioning as a sensory array to detect changes in the environment, and serving as a hydrostatic skeleton to aid in locomotion. However, it does not act as a hook to burrow into muscle tissue forming cysts for parasitic nematodes.

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11.

A rasping radula is characteristic of all mollusks EXCEPT _________.
- A.
  
  Bivalves
- B.
  
  Gastropods
- C.
  
  Cephalopods
- D.
  
  Chitons
Correct Answer
A. Bivalves

Explanation
Of all mollusks, only the bivalves lack a radula.

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12.

The only class of mollusk to have a closed circulatory system includes the _______.
- A.
  
  Brachiopod
- B.
  
  Snail
- C.
  
  Oyster
- D.
  
  Octopus
Correct Answer
D. Octopus

Explanation
Only members of Class Cephalopoda (e.g squid, octopus) in mollusk have a closed circulatory system.

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13.

The leech characteristic, _______________ , shared with oligochaetes is part of the evidence that leeches evolved from oligochaetes.
- A.
  
  Suckers
- B.
  
  Metameric segmentation
- C.
  
  Clitellum
- D.
  
  Parapodia
Correct Answer
C. Clitellum

Explanation
Both of subclasses Hirudinea (e.g leeches) Oligochaeta are placed under Class Clitellata (having a clitellum).

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14.

Sexually, earthworms (oligochaetes) are _____________.
- A.
  
  Separate sexed
- B.
  
  Hermaphroditic but not self-fertilizing
- C.
  
  Parthenogenic
- D.
  
  Hermaphroditic and self-fertilizing
Correct Answer
B. Hermaphroditic but not self-fertilizing

Explanation
Earthworms are hermaphroditic, meaning they possess both male and female reproductive organs. However, they are not self-fertilizing, which means they cannot fertilize their own eggs with their own sperm. Instead, earthworms engage in cross-fertilization, where they exchange sperm with another earthworm during mating. This allows for genetic diversity and prevents inbreeding.

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15.

Polychaetes (Annelida) and Mollusca shared a characteristic by having a trochophore larvae during their first larval stage.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Polychaetes and Mollusca both have a trochophore larvae during their first larval stage. This is a characteristic that they share, indicating a common evolutionary history. The trochophore larvae is a distinct larval form characterized by a ring of cilia around the body, which is important for locomotion and feeding. This stage is present in both Polychaetes and Mollusca, supporting the statement that they share this characteristic. Therefore, the answer is true.

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Quiz #2: Lower Invertebrates

Ctenophores posess eight comb rows composed of long, fused ______.

Ctenophores do not possess nematocysts, instead they have adhesive prey capturing cells called _________.

In Ctenophores, what are used for locomotion?

The free-living platyhelminths are usually considered the most primitive bilateral animals and the 1^st group to have evolved a true ______________.

Flatworms osmoregulates through a specialized organ called __________.

Light-sensitive sense organs in the flatworms are called ______.

The human liver fluke, Clonorchis sinensis, is common in China, and can cause cirrhosis of the liver and death.

Members in the Phylum Nematoda possess a pair of lateral sensory organs called _______.

Most nematodes are _. Males are smaller than females and may have an accessory _ structure.

Which is NOT TRUE about the cuticle functions in nematodes?

A rasping radula is characteristic of all mollusks EXCEPT _________.

The only class of mollusk to have a closed circulatory system includes the _______.

The leech characteristic, _______________ , shared with oligochaetes is part of the evidence that leeches evolved from oligochaetes.

Sexually, earthworms (oligochaetes) are _____________.

Polychaetes (Annelida) and Mollusca shared a characteristic by having a trochophore larvae during their first larval stage.

Quiz #2: Lower Invertebrates

Ctenophores posess eight comb rows composed of long, fused ______.

Ctenophores do not possess nematocysts, instead they have adhesive prey capturing cells called _________.

In Ctenophores, what are used for locomotion?

The free-living platyhelminths are usually considered the most primitive bilateral animals and the 1st group to have evolved a true ______________.

Flatworms osmoregulates through a specialized organ called __________.

Light-sensitive sense organs in the flatworms are called ______.

The human liver fluke, Clonorchis sinensis, is common in China, and can cause cirrhosis of the liver and death.

Members in the Phylum Nematoda possess a pair of lateral sensory organs called _______.

Most nematodes are _______. Males are smaller than females and may have an accessory _______ structure.

Which is NOT TRUE about the cuticle functions in nematodes?

A rasping radula is characteristic of all mollusks EXCEPT _________.

The only class of mollusk to have a closed circulatory system includes the _______.

The leech characteristic, _______________ , shared with oligochaetes is part of the evidence that leeches evolved from oligochaetes.

Sexually, earthworms (oligochaetes) are _____________.

Polychaetes (Annelida) and Mollusca shared a characteristic by having a trochophore larvae during their first larval stage.

The free-living platyhelminths are usually considered the most primitive bilateral animals and the 1^st group to have evolved a true ______________.

Most nematodes are _. Males are smaller than females and may have an accessory _ structure.