QUIZ 1_STH2073 INVERTEBRATE BIOLOGY

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| By Wnurainie

Wnurainie

Community Contributor

Quizzes Created: 3 | Total Attempts: 1,080

Questions: 10 | Attempts: 196 | Updated: Mar 18, 2023

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Questions and Answers

1.

A group of species sharing an immediate ancestor but not including all descendants is known as _______.

Explanation
A group of species sharing an immediate ancestor but not including all descendants is known as paraphyletic. This means that the group includes some, but not all, of the descendants of a common ancestor. It is different from a monophyletic group, which includes all descendants of a common ancestor. In a paraphyletic group, some branches of the evolutionary tree are excluded, leading to a classification that does not accurately represent the true relationships between species.

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4
2.

Most metazoans are tripoblastic animals.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Tripoblastic animals are organisms which have three germ layers; ectoderm, endoderm and mesoderm.

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3.

Based on the following statements, which is NOT TRUE about the function of choanocyte in sponges?
- A.
  
  To capture small food particles.
- B.
  
  To capture incoming sperm for fertilization.
- C.
  
  To store digested food materials.
- D.
  
  To generate currents for maintaining the circulation of seawater within sponges
Correct Answer
C. To store digested food materials.

Explanation
Archaeocytes are amoeboid cells that carry out phagocytosis. Other than that, they serve as storage of digested food materials.

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4.

Opening of the poriferans body walls consist of oscula that allows water in and ostia that lets water out.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Ostia = allows water in; oscula = lets water out

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5.

Members of Phylum Porifera are further divided into clasess based upon ___________.
- A.
  
  Chemical composition of support elements
- B.
  
  Types of body contruction
- C.
  
  The presence of choanocytes
- D.
  
  The morphology of support elements
Correct Answer(s)
A. Chemical composition of support elements
D. The morpHology of support elements

Explanation
Members of Phylum Porifera are divided into classes based on the chemical composition and morphology of their support elements. The chemical composition refers to the materials that make up the support structures, such as calcium carbonate or silica. The morphology refers to the shape and structure of these support elements, which can vary among different classes of Porifera. Both factors play a crucial role in classifying and distinguishing the different classes within this phylum.

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6.

Members of Class Calcarea are distinguished from other classes by having spicules composed of __________.

Correct Answer(s)
calcium carbonate

Explanation
Members of Class Calcarea are distinguished from other classes by having spicules composed of calcium carbonate. Calcium carbonate is a common mineral found in the shells of marine organisms, such as corals and mollusks. In the case of Class Calcarea, these spicules provide structural support and protection for the organisms. This is a defining characteristic of this class, as other classes may have spicules composed of different materials or may not have spicules at all.

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4
7.

Osmoregulation in Phylum Protozoa is happen by means of a contractile vacuole.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Osmoregulation is the process by which organisms regulate the balance of water and solutes in their bodies. In Phylum Protozoa, osmoregulation is achieved through the use of a contractile vacuole. The contractile vacuole acts as a water pump, collecting excess water from the cytoplasm and expelling it out of the cell. This helps maintain the proper balance of water and solutes within the cell, allowing the protozoa to survive in various environments. Therefore, the statement "Osmoregulation in Phylum Protozoa is happen by means of a contractile vacuole" is true.

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8.

Asexual (clonal) reproduction in Protozoan are by means of ________.

Correct Answer
binary fission and budding
budding and binary fission

Explanation
Protozoans are single-celled organisms that reproduce asexually through binary fission and budding. Binary fission is a process in which the cell divides into two identical daughter cells, while budding involves the formation of a smaller daughter cell that eventually separates from the parent cell. Both methods allow for the production of genetically identical offspring, ensuring the clonal reproduction of the protozoan. Therefore, the correct answer is binary fission and budding, or budding and binary fission.

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4
9.

Amoebiosis that causes internal inflammation are responsible by _______________.
- A.
  
  Vorticella sp.
- B.
  
  Entamoeba histolytica
- C.
  
  Plasmodium palcifarum
- D.
  
  Trypanosoma sp.
Correct Answer
B. Entamoeba histolytica

Explanation
Entamoeba histolytica is responsible for causing amoebiosis, which is characterized by internal inflammation. This parasitic amoeba infects the intestines and can cause severe gastrointestinal symptoms such as diarrhea, abdominal pain, and inflammation of the intestinal wall. If left untreated, Entamoeba histolytica can invade other organs, leading to more serious complications like liver abscesses. Therefore, this organism is directly associated with the internal inflammation observed in cases of amoebiosis.

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Current Version
Mar 18, 2023

Quiz Edited by
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Oct 05, 2015

Quiz Created by
Wnurainie

Quiz 1_sth2073 Invertebrate Biology

A group of species sharing an immediate ancestor but not including all descendants is known as _______.

Most metazoans are tripoblastic animals.

Based on the following statements, which is NOT TRUE about the function of choanocyte in sponges?

Opening of the poriferans body walls consist of oscula that allows water in and ostia that lets water out.

Members of Phylum Porifera are further divided into clasess based upon ___________.

Members of Class Calcarea are distinguished from other classes by having spicules composed of __________.

Osmoregulation in Phylum Protozoa is happen by means of a contractile vacuole.

Asexual (clonal) reproduction in Protozoan are by means of ________.

Amoebiosis that causes internal inflammation are responsible by _______________.