Parasitic wasps lay their eggs directly into the eggs of : GMAT Critical Reasoning (CR)
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# Parasitic wasps lay their eggs directly into the eggs of

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Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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26 Jun 2008, 02:24
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Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behaviour.

B) Host insects lack any effective defenses against the form of predation practised by parasitic wasps.

C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.

D) Failure to lay enough eggs would lead to the death of the developing larvae more quickly than would laying too many eggs.

E) Parasitic wasps use visual clues to calculate the size of a host egg.
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26 Jun 2008, 03:10
Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behaviour.
- Yes, wasp egg laying behaviour can help us to find this to certain extent! - Keep it.

B) Host insects lack any effective defenses against the form of predation practised by parasitic wasps. - Out of scope, defenses is not talked about, there could be a defense mechanism which might be operating which is not talked abt. POE

C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. - This again is not mentioned anywhere. Eliminate

D) Failure to lay enough eggs would lead to the death of the developing larvae more quickly than would laying too many eggs.
Rates are not mentioned. EliminateE) Parasitic wasps use visual clues to calculate the size of a host egg.
- Again we know nothing abt how wasps calculate - Eliminate.

So only reasonal option left out is A....

What is OA?
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02 Jul 2008, 09:48
OA is A.
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03 Jul 2008, 07:33
lexis wrote:
Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behaviour.

B) Host insects lack any effective defenses against the form of predation practised by parasitic wasps.

C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.

D) Failure to lay enough eggs would lead to the death of the developing larvae more quickly than would laying too many eggs.

E) Parasitic wasps use visual clues to calculate the size of a host egg.

I'll have to go for A. The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behaviour. This clearly follows on from the first sentence "Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg".
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03 Jul 2008, 07:44
B) Passage did not mention anything about the host
C) Passage did not mention how the wasp knows to lay the eggs
D) Passage mentioned the consequences of laying the incorrect # of eggs, but did not mention anything about the rate of death
E) Same as C

A) Since we know that the wasp lays the exact # of eggs needed per host egg, it would lay the exact number of eggs depending on the size of the host egg
Re: CR: Parasitic wasps   [#permalink] 03 Jul 2008, 07:44
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