Skip to main content
Ch. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and Helminths
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTortora 14th EditionCh. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and HelminthsProblema 2
Capitolo 8, Problema 2

Use the following choices to answer the following question:
1. Metacercaria
2. Redia
3. Adult
4. Miracidium
5. Cercaria


Put the preceding stages in order of development, beginning with the egg.
a. 5, 4, 1, 2, 3
b. 4, 2, 5, 1, 3
c. 2, 5, 4, 3, 1
d. 3, 4, 5, 1, 2
e. 2, 4, 5, 1, 3

Guida verificata passo dopo passo
1
Step 1: Understand the life cycle stages of a typical trematode (fluke). The stages given are: egg, miracidium, redia, cercaria, metacercaria, and adult. The egg hatches into the miracidium, which infects the first intermediate host (usually a snail).
Step 2: Inside the snail, the miracidium develops into the redia stage. The redia then produces cercariae, which leave the snail to find the next host or encyst on vegetation or a second intermediate host.
Step 3: The cercaria transforms into the metacercaria stage, which is the encysted form that is infective to the definitive host. When the definitive host ingests the metacercaria, it develops into the adult fluke.
Step 4: Arrange the stages in the correct developmental order starting from the egg: egg → miracidium → redia → cercaria → metacercaria → adult.
Step 5: Compare this order to the options provided and select the one that matches the sequence: miracidium (4), redia (2), cercaria (5), metacercaria (1), adult (3).

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Life Cycle of Trematodes

Trematodes, or flukes, have complex life cycles involving multiple developmental stages and hosts. Understanding the sequence from egg to adult is essential, as each stage (miracidium, redia, cercaria, metacercaria, adult) plays a specific role in development and transmission.
Video consigliato:
01:37
Krebs Cycle

Developmental Stages and Their Functions

Each stage in the trematode life cycle has distinct morphology and function: the miracidium hatches from the egg and infects the intermediate host; the redia develops within the host producing cercariae; cercariae leave the host to find the next stage; metacercaria is the encysted form infective to the definitive host; adults mature and reproduce.
Video consigliato:
03:16
Stages of Photosynthesis

Host Specificity and Transmission

Trematodes require specific intermediate and definitive hosts to complete their life cycle. The transition between stages often involves moving between aquatic environments and hosts, which is critical for understanding the order of development and how infection spreads.
Video consigliato:
04:23
Transmission Electron Microscope (TEM)
Pratica correlata
Domanda del libro di testo

A mixed culture of Escherichia coli and Penicillium chrysogenum is inoculated onto the following culture media. On which medium would you expect each to grow? Why?

a. 0.5% peptone in tap water

b. 10% glucose in tap water

1498
views
Domanda del libro di testo

Following is a list of fungi, their methods of entry into the body, and sites of infections they cause. Categorize each type of mycosis as cutaneous, opportunistic, subcutaneous, superficial, or systemic.

1589
views
Domanda del libro di testo

Identify the structures of this eukaryote, which has an affinity for keratin.

<IMAGE>

1476
views
Domanda del libro di testo

Use the following choices to answer questions 2 and 3:

1. metacercaria

2. redia

3. adult

4. miracidium

5. cercaria

If a snail is the first intermediate host of a parasite with these stages, which stage would be found in the snail?

a. 1

b. 2

c. 3

d. 4

e. 5

855
views
Domanda del libro di testo

How many phyla are represented in the following list of organisms: Echinococcus, Cyclospora, Aspergillus, Taenia, Toxoplasma, Trichinella?

a. 1

b. 2

c. 3

d. 4

e. 5

1574
views