Schistosomiasis, a Disease caused by a Parasitic Worm, is Prevalent in Hot, Humid Climates, and it has Become more Widespread as Irrigation Projects have Enlarged the Habitat of the Freshwater Snails that are the Parasite's Hosts for Part of its Life Cycle.

Question: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

1. the freshwater snails that are the parasite's hosts for part of its life cycle
2. the freshwater snails that are the parasite's hosts in part of their life cycle
3. freshwater snails which become the parasite's hosts for part of its life cycles
4. freshwater snails which become the hosts of the parasite during the parasite's life cycles
5. parasite's hosts, freshwater snails which become their hosts during their life cycles

“Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.” - is a GMAT sentence correction question. These types of questions contain grammatical errors in the underlined sentence and we have to choose the correct statement from the options. GMAT sentence correction is a part of GMAT verbal.

Answer: A
Explanation:

The given sentence correction question is tested by the given-below rules:

• Parallelism
• Comparison of two elements
• Modifiers

Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

Meaning:

• Schistosomiasis could be a disease that's caused by a worm.
• it's prevalent in places with a hot and humid climate.
• The disease has become more widespread with the rise in irrigation projects.
• These projects have enlarged the habitat of the freshwater snails that play the host of the parasite for part of its life cycle.

Error Analysis:

• Subject “that” that stands for “the freshwater snails” agrees in number and is sensible with the verb “are”. No SV pair error.
• This sentence is providing general facts about the disease and its cause. Hence simple present tense “are“ is correct.
• “that” clause correctly modifies “the freshwater snails” giving information that these snails become host to the parasite for a few part in their life.
• There are not any pronouns, no parallelism, no idiom, and no meaning error errors.

Now let's check the options -

1. The singular possessive pronoun “its” agrees with the singular possessive noun “parasite’s”. Also “That are” refers to "freshwater snails”. Therefore it is the correct answer.
2. The plural possessive pronoun “their” does not agree with the singular possessive noun “parasite’s”. This option is INCORRECT.
3. C can be eliminated because of the incorrect usage of “lifecycles”. The parasite does not have more than one lifecycle.
4. A parasite does not have more than one life cycle. This is also incorrect.
5. In this option, it is written “their lifecycles”. This is also INCORRECT.

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