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The diet of Heliothis subjlexa caterpillars consists entirely of fruit

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The diet of Heliothis subjlexa caterpillars consists entirely of fruit  [#permalink]

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New post 25 Sep 2017, 01:39
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The diet of Heliothis subflexa caterpillars consists entirely of fruit from plants of the genus Physalis. These fruit do not contain linolenic acid, which is necessary to the growth and maturation of many insects other than H. subflexa. Linolenic acid in an insect's diet is also necessary for the production of a chemical called volicitin. While most caterpillar species have volicitin in their saliva, H. subflexa does not.

Which one of the following can be properly inferred from the statements above?

(A) H. subflexa caterpillars synthesize linolenic acid within their bodies.

(B) Most species of caterpillar have sources of linolenic acid in their diets.

(C) Any caterpillar that has linolenic acid in its diet has volicitin in its saliva.

(D) A food source containing linolenic acid would be poisonous to H. subflexa caterpillars.

(E) No caterpillars other than H. subflexa eat fruit from plants of the genus Physalis.

Source: LSAT
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Re: The diet of Heliothis subjlexa caterpillars consists entirely of fruit  [#permalink]

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New post 25 Sep 2017, 02:14
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ganand wrote:
The diet of Heliothis subflexa caterpillars consists entirely of fruit from plants of the genus Physalis. These fruit do not contain linolenic acid, which is necessary to the growth and maturation of many insects other than H. subflexa. Linolenic acid in an insect's diet is also necessary for the production of a chemical called volicitin. While most caterpillar species have volicitin in their saliva, H. subflexa does not.

Which one of the following can be properly inferred from the statements above?

(A) H. subflexa caterpillars synthesize linolenic acid within their bodies.

(B) Most species of caterpillar have sources of linolenic acid in their diets.

(C) Any caterpillar that has linolenic acid in its diet has volicitin in its saliva.

(D) A food source containing linolenic acid would be poisonous to H. subflexa caterpillars.

(E) No caterpillars other than H. subflexa eat fruit from plants of the genus Physalis.

Source: LSAT


Short Story : 1. The diet of Heliothis subflexa caterpillars consists entirely of fruit from plants of the genus Physalis.
2. These fruit do not contain linolenic acid, which is necessary to the growth and maturation of many insects other than H. subflexa.
3. Linolenic acid in an insect's diet is also necessary for the production of a chemical called volicitin.
4. While most caterpillar species have volicitin in their saliva, H. subflexa does not.

Inference : So, it is clear that the Heliothis sublflexa is not having Linolenic acid from its diet. Also since it is having volicitin in its saliva, so it also not synthesizing Linolenic acid in its body. Basically H. subflexa is not having Linolenic acid at all.

(A) H. subflexa caterpillars synthesize linolenic acid within their bodies.
If they would have been synthesizing linolenic acid within their bodies, they might be having volicitin in their saliva, which is not the case. So, it cannot be inferred.


(B) Most species of caterpillar have sources of linolenic acid in their diets.
Yes it can be inferred that most of the caterpillar other than H. subflexa caterpillars is getting linolenic acid from their diet.

(C) Any caterpillar that has linolenic acid in its diet has volicitin in its saliva.
It cannot be inferred. There might be caterpillars who might nit be having volicitin in their saliva.

(D) A food source containing linolenic acid would be poisonous to H. subflexa caterpillars.
Out of scope

(E) No caterpillars other than H. subflexa eat fruit from plants of the genus Physalis.
It cannot be inferred. other caterpillars might be eating fruit from plants of the genus Physalis and other items also.
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Re: The diet of Heliothis subjlexa caterpillars consists entirely of fruit  [#permalink]

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New post 25 Sep 2017, 05:36
It is said that " many insects other than H. subflexa" needs linolenic acid -> Linolenic acid in an insect's diet is also necessary for the production of a chemical called volicitin
So it can be inferred as
Most species of caterpillar have sources of linolenic acid in their diets

Answer is B
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Re: The diet of Heliothis subjlexa caterpillars consists entirely of fruit  [#permalink]

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New post 05 Jan 2018, 19:40
this LSAT question is not difficult, and test takers who look for questions to practice can find this question helpful.
B and D are left.
B is much better than D b/c B connects with "maturation and growth" while D concerns with the poisonous food.
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Re: The diet of Heliothis subjlexa caterpillars consists entirely of fruit  [#permalink]

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New post 06 Jan 2018, 14:13
The diet of Heliothis subflexa caterpillars consists entirely of fruit from plants of the genus Physalis. These fruit do not contain linolenic acid, which is necessary to the growth and maturation of many insects other than H. subflexa. Linolenic acid in an insect's diet is also necessary for the production of a chemical called volicitin. While most caterpillar species have volicitin in their saliva, H. subflexa does not.

Which one of the following can be properly inferred from the statements above?

(A) H. subflexa caterpillars synthesize linolenic acid within their bodies. -Can't say

(B) Most species of caterpillar have sources of linolenic acid in their diets. -Correct. Since the source of volicitin is linolenic acid, most caterpillars must be having linolenic acid in their diet.

(C) Any caterpillar that has linolenic acid in its diet has volicitin in its saliva. -Extreme. Just because most caterpillar generate volicin in their saliva doesn't mean that all caterpillars will generate volicin in their saliva.

(D) A food source containing linolenic acid would be poisonous to H. subflexa caterpillars. -out of scope

(E) No caterpillars other than H. subflexa eat fruit from plants of the genus Physalis. -can't say
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Re: The diet of Heliothis subjlexa caterpillars consists entirely of fruit &nbs [#permalink] 06 Jan 2018, 14:13
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