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Light is registered in the retina when

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Light is registered in the retina when [#permalink] New post 17 Feb 2014, 20:51
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Hi Everyone

I have a doubt a read it in the MGMAT guides that for must be true questions an answer choice that introduces new information is considered wrong.
Then why in this question the correct answer is B and not C where in the stimulus have they mentioned animals?? :shock: :shock:

Can anyone please explain..

Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules' shape. Even when they have not been struck by photons of light, rhydopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.

Which one of the following conclusions is most strongly supported by the information above?

A) The temperature of an animal's retina depends on the amount of light the retina is absorbing.

B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas?

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.
[Reveal] Spoiler: OA
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Re: Light is registered in the retina when [#permalink] New post 17 Feb 2014, 23:05
We can't really deduce C as it says that As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons while stem says that The amount of this molecular motion is directly proportional to the temperature of the retina. To me, I inferred this as -as temperature of the retina rises, rhodopsin molecules' motion will increase.

But at the same time B also doesn't look good either as it says that The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones. The stem never mentions that temperature of the retina will be same as that of body. In a way, we might apply common sense here but not sure if we can have this common sense assumption which is never stated or rephrased in the stem. Moreover, as you mentioned the stem never says anything about animals specifically.

Would like expert inputs here!! Will be helpful :-)
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Re: Light is registered in the retina when [#permalink] New post 18 Feb 2014, 00:31
Yeah you are right but why B that is the question since no where in the stimulus animals are mentioned ? :roll:
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Re: Light is registered in the retina when [#permalink] New post 18 Feb 2014, 05:41
Though I chose C, I agree C doesn't look deducible. But B don't look good either. It talks about animals & body temperature without making a link to retina. The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
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Re: Light is registered in the retina when [#permalink] New post 18 Feb 2014, 19:24
Yes you are right that C does not look any good either and The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
But again the mystery of new info is still unresolved.

Can experts please bump in to throw more light on this?
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Light is registered in the retina when [#permalink] New post 06 Aug 2014, 02:48
both B and C look bad options to me but B has a slight edge because it talks about the proportionality and C talks about the effect of temperature on rhodopsin molecules & photons which is not discussed in the argument
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Re: Light is registered in the retina when [#permalink] New post 28 Aug 2014, 22:50
amyjohn wrote:
Hi Everyone

I have a doubt a read it in the MGMAT guides that for must be true questions an answer choice that introduces new information is considered wrong.
Then why in this question the correct answer is B and not C where in the stimulus have they mentioned animals?? :shock: :shock:

Can anyone please explain..

Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules' shape. Even when they have not been struck by photons of light, rhydopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.

Which one of the following conclusions is most strongly supported by the information above?

A) The temperature of an animal's retina depends on the amount of light the retina is absorbing.

B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas?

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.


Hi guys,
Lemme try to attempt this one! I marked B though ( I agree that "animal" threw me also off)

A .The temperature of an animal's retina depends on the amount of light the retina is absorbing. -- Nowhere does it states that about the amount of light that gets absorbed. It just talks about the light photons being hit. INCORRECT

B. The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones. - Assume that a particular animal lives in hot surroundings and itself has high body temperature and therefore "high retina temperature"(retina being a part of body) too. Now, higher the temp of retina, higher the molecular motion(something that is stated in the stimulus). Vice-versa can be sad about cold temperatures. MAKES SENSE.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons. -- Reaction was never talked about. INCORRECT

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas.--Surface areas was never talked about. INCORRECT

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina. --- Only pigment? No one said that ! INCORRECT

Let me know if it helped!
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Re: Light is registered in the retina when [#permalink] New post 28 Aug 2014, 22:59
amyjohn wrote:
Yes you are right that C does not look any good either and The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
But again the mystery of new info is still unresolved.

Can experts please bump in to throw more light on this?


Hi amyjohn,

According to me, mystery can be solved somewhat as -
Option C, D and E gives you the info which is new and something that cannot be derived or deduced from the passage!. However in A, B the word "animal" does sound like a new info certainly, but how can we be so sure that the stimulus given is "not about animals". It nowhere mentions "human" or for that matter animal too. So may be stimuli is all about animals only , so I believe it should not be considered new info.
This can be only understood once u take a second look at the stimulus.

Let me know if this helped :)
Re: Light is registered in the retina when   [#permalink] 28 Aug 2014, 22:59
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