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In the Sonoran Desert of northwestern Mexico and southern Arizona, t

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Re: In the Sonoran Desert of northwestern Mexico and southern Arizona, t  [#permalink]

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New post 12 Jan 2018, 00:11
Would anyone please explain the POE of A for the question 3 ?
Seemed tough passage.
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Re: In the Sonoran Desert of northwestern Mexico and southern Arizona, t  [#permalink]

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New post 09 Feb 2018, 08:18
soumya170293 wrote:
Would anyone please explain the POE of A for the question 3 ?
Seemed tough passage.


In my opinion, A is incorrect because the first sentence of the passage says: "In the Sonoran Desert of northwestern Mexico and southern Arizona, the flowers of several species of columnar cacti—cardon, saguaro, and organ pipe—were once exclusively pollinated at night by nectar-feeding bats, as their close relatives in arid tropical regions of southern Mexico still are." => this means they are both have flowers that remain open after sunset, so this can't be a difference between these two.
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Re: In the Sonoran Desert of northwestern Mexico and southern Arizona, t  [#permalink]

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New post 10 May 2018, 16:51
1
P1 - some cacti evolved from night time to day time pollination.
P2 - reasons given for situation defined in p1.

The primary purpose of the passage is to
A. compare the adaptive responses of several species of columnar cacti in the Sonoran Desert with those in the arid tropical regions of southern Mexico - p2
B. discuss some of the possible causes of the relatively low abundance of migratory nectar-feeding bats in the Sonoran Desert - P2/2
C. provide a possible explanation for a particular evolutionary change in certain species of columnar cacti in the Sonoran Desert - Most accurate among all.
D. present recent findings that challenge a particular theory as to why several species of columnar cacti in the Sonoran Desert have expanded their range of pollinators - challenge a theory is not there, its a simple explanation.
E. compare the effectiveness of nocturnal and diurnal pollination for several different species of columnar cacti in the Sonoran Desert -- Passage is certainly not about this.
------------------------------------------------

(Book Question: 440)
According to the passage, which of the following types of nectar-feeding pollinators is likely to be an unreliable pollinator of a particular cactus flower?
Lines to read - cactus-flower abundance tends to be high during spring, bat population densities tend to be low except near maternity roosts.
B. A dietary specialist whose abundance is at times significantly lower than that of the flower - correct.

------------------------------------------------
(Book Question: 441)
According to the passage, present-day columnar cacti in the Sonoran Desert differ from their close relatives in southern Mexico in that the Sonoran cacti

E. are sometimes pollinated by diurnal pollinators - the flowers of the Sonoran Desert cacti have evolved to remain open after sunrise, allowing pollination by such diurnal visitors as bees and birds.
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Re: In the Sonoran Desert of northwestern Mexico and southern Arizona, t &nbs [#permalink] 10 May 2018, 16:51

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