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# Biological functions of many plants and animals vary in cycles that

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Retired Moderator
Joined: 19 Mar 2014
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Concentration: Finance, Entrepreneurship
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Re: Biological functions of many plants and animals vary in cycles that  [#permalink]

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20 Apr 2017, 12:07
Biological functions of many plants and animals
vary in cycles that are repeated every 24 hours. It is
tempting to suppose that alteration in the intensity
of incident light is the stimulus that controls
these daily biological rhythms. But there is much
evidence to contradict this hypothesis.

Which of the following, if known, is evidence that contradicts the hypothesis stated in lines 2-5 above?

(A) Human body temperature varies throughout the day, with the maximum occurring in the late afternoon and the minimum in the morning.

- This option talks about the temperature impact on human body and nowhere mentions the impact of the light, hence this option is irrelevant.

(B) While some animals, such as the robin, are more active during the day, others, such as mice, show greater activity at night

- Once again, this option talk about day and night but we cannot conclude that light is playing a role in this behaviour. Hence, B is irrelevant too.

(C) When people move from one time zone to another, their biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone.
- Time zones is completely out of Scope.

(D) Certain single-cell plants display daily biological rhythms even when the part of the cell containing the nucleus is removed.
- Talks about biological rhythms but does not mention anything about light, once again out.

(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night.

- This option is clearly taking into consideration the impact of light. It definitely weakens the argument.

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Joined: 28 Jun 2016
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Re: Biological functions of many plants and animals vary in cycles that  [#permalink]

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12 Nov 2017, 06:30
1
Read the second part of the question carefully, "alteration" in the intensity...reason for the change in biological rhythms.
so we are concerned with the change in light intensity, be it any light.

option E clearly states that, even after providing "constant light intensity" exposure to algae, rates of photosynthesis (biological rhythms)...greater during daylight hours( we are speaking only of hours, the light intensity is still constant) than at NIGHT( whoa!! there is a variation in biological rhythms!!...who the hell did it, definitely not light intensity coz that was kept constant throughout!)
whoa!! again hypothesis overruled

hope you understood it.

please give a kudos if you understood!!:)
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Re: Biological functions of many plants and animals vary in cycles that  [#permalink]

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03 Sep 2018, 07:43
1
plumber250 wrote:
Hi - I agree.

E is not the correct answer. It supports the conclusion that light is not the key thing that causes creatures to distinguish between day and night...

James

Thanks.
Re: Biological functions of many plants and animals vary in cycles that &nbs [#permalink] 03 Sep 2018, 07:43

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# Biological functions of many plants and animals vary in cycles that

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