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

검증된 단계별 안내

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).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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.

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.

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.

Use the following choices to answer the following question:1. Metacercaria2. Redia3. Adult4. Miracidium5. CercariaPut the preceding stages in order of development, beginning with the egg.a. 5, 4, 1, 2, 3b. 4, 2, 5, 1, 3c. 2, 5, 4, 3, 1d. 3, 4, 5, 1, 2e. 2, 4, 5, 1, 3