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

검증된 단계별 안내

Identify the life cycle stages of the parasite listed: metacercaria, redia, adult, miracidium, and cercaria.

Recall that the first intermediate host in many trematode (fluke) life cycles is typically a snail.

Understand that the miracidium is the free-swimming larval stage that infects the snail, but it does not develop inside the snail for long.

Recognize that inside the snail, the parasite undergoes asexual reproduction and develops into rediae (plural of redia), which then produce cercariae.

Conclude that the stage found inside the snail as the main developmental form is the redia (choice 2).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

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 hosts and developmental stages. Understanding these stages—such as miracidium, redia, cercaria, metacercaria, and adult—is essential to identify where each stage occurs, especially in intermediate hosts like snails.

Role of the Snail as First Intermediate Host

In trematode life cycles, the snail typically serves as the first intermediate host where early larval stages develop. The miracidium infects the snail and transforms into rediae, which multiply asexually before producing cercariae that leave the snail to continue the cycle.

Identification of Larval Stages in the Snail

Within the snail, the parasite exists mainly as rediae and cercariae stages. Miracidia penetrate the snail, then develop into rediae, which produce cercariae. Metacercariae and adults are found in later hosts, not in the snail, making redia and cercaria the key stages inside the snail.

Use the following choices to answer questions 2 and 3:1. metacercaria2. redia3. adult4. miracidium5. cercariaIf a snail is the first intermediate host of a parasite with these stages, which stage would be found in the snail?a. 1b. 2c. 3d. 4e. 5