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13 May 2026, 00:20
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
69% (01:53) correct
31%
(02:17)
wrong
based on 36
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In the spring and fall, eastern pipistrelle bats roost deep inside caves. They feed at night on flying insects and must leave the cave to catch their prey. Flying insects are much more abundant on warm nights than on cool ones. Researchers found that many more bats leave the caves on warm nights than on cool nights, even though the temperature within the caves where the bats roost remains virtually the same from one night to the next.
Which one of the following, if true, most helps to explain the researchers' findings?
(A) The researchers studied only female bats, which tended to catch more insects on warm nights than did the male bats.
(B) Eastern pipistrelle bats can detect changes in barometric pressure within the caves that correlate closely with changes in temperature outside the caves.
(C) Eastern pipistrelle bats are incapable of long periods of sustained activity outside the roosting caves on very cool spring and fall evenings.
(D) Because of the long period of winter inactivity, eastern pipistrelle bats tend to consume more insects per day in the spring and fall than in the summer.
(E) During the periods in which the researchers studied the bats, on most evenings over half of the bats left the caves in search of food.
Which one of the following, if true, most helps to explain the researchers' findings?
(A) The researchers studied only female bats, which tended to catch more insects on warm nights than did the male bats.
(B) Eastern pipistrelle bats can detect changes in barometric pressure within the caves that correlate closely with changes in temperature outside the caves.
(C) Eastern pipistrelle bats are incapable of long periods of sustained activity outside the roosting caves on very cool spring and fall evenings.
(D) Because of the long period of winter inactivity, eastern pipistrelle bats tend to consume more insects per day in the spring and fall than in the summer.
(E) During the periods in which the researchers studied the bats, on most evenings over half of the bats left the caves in search of food.
ankushsambare
Joined: 13 Jun 2022
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13 May 2026, 02:33
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Premise
Bats roost inside caves where the temperature stays almost the same every night.
Flying insects are more abundant on warm nights.
Researchers found that more bats leave the caves on warm nights than on cool nights.
Question
How do bats know whether the outside night is warm or cool if cave temperature stays constant?
Prethinking
We need an explanation showing that bats can somehow sense outside weather conditions while still inside the cave.
Option check
A Only female bats studied → does not explain how bats know outside temperature
B Bats detect barometric pressure changes linked to outside temperature → explains how they know when warm nights occur
C Bats cannot stay active on cool nights → explains behavior partly, but not how they know before leaving
D Spring/fall eating habits → irrelevant
E Most bats left on many evenings → irrelevant
Correct Answer B
Conclusion
B best explains the findings because it shows bats can detect pressure changes inside the cave that signal warmer temperatures outside, helping them decide when to leave and hunt.
Bats roost inside caves where the temperature stays almost the same every night.
Flying insects are more abundant on warm nights.
Researchers found that more bats leave the caves on warm nights than on cool nights.
Question
How do bats know whether the outside night is warm or cool if cave temperature stays constant?
Prethinking
We need an explanation showing that bats can somehow sense outside weather conditions while still inside the cave.
Option check
A Only female bats studied → does not explain how bats know outside temperature
B Bats detect barometric pressure changes linked to outside temperature → explains how they know when warm nights occur
C Bats cannot stay active on cool nights → explains behavior partly, but not how they know before leaving
D Spring/fall eating habits → irrelevant
E Most bats left on many evenings → irrelevant
Correct Answer B
Conclusion
B best explains the findings because it shows bats can detect pressure changes inside the cave that signal warmer temperatures outside, helping them decide when to leave and hunt.
13 May 2026, 09:15
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In the spring and fall, eastern pipistrelle bats roost deep inside caves. They feed at night on flying insects and must leave the cave to catch their prey. Flying insects are much more abundant on warm nights than on cool ones. Researchers found that many more bats leave the caves on warm nights than on cool nights, even though the temperature within the caves where the bats roost remains virtually the same from one night to the next.
Which one of the following, if true, most helps to explain the researchers' findings?
The puzzle is that bats leave more often on warm nights, even though the cave temperature stays almost the same. So the answer should explain how bats inside the cave can respond to outside conditions. The key issue is how the bats detect that it is warm outside.
(A) The researchers studied only female bats, which tended to catch more insects on warm nights than did the male bats.
Wrong. This does not explain how the bats know whether the outside night is warm or cool.
(B) Eastern pipistrelle bats can detect changes in barometric pressure within the caves that correlate closely with changes in temperature outside the caves.
Correct. If bats can detect pressure changes inside the cave that correspond to outside temperature, then they can tell when warm nights are likely. That explains why more bats leave on warm nights, when more insects are available.
(C) Eastern pipistrelle bats are incapable of long periods of sustained activity outside the roosting caves on very cool spring and fall evenings.
Tempting, but incomplete. This explains why cool nights are bad for activity, but it does not explain how bats inside a cave with stable temperature know whether the outside is cool.
(D) Because of the long period of winter inactivity, eastern pipistrelle bats tend to consume more insects per day in the spring and fall than in the summer.
Wrong. This compares seasons, not warm nights versus cool nights within spring and fall.
(E) During the periods in which the researchers studied the bats, on most evenings over half of the bats left the caves in search of food.
Wrong. This does not explain why more bats left on warm nights than on cool nights.
Answer: (B)
Which one of the following, if true, most helps to explain the researchers' findings?
The puzzle is that bats leave more often on warm nights, even though the cave temperature stays almost the same. So the answer should explain how bats inside the cave can respond to outside conditions. The key issue is how the bats detect that it is warm outside.
(A) The researchers studied only female bats, which tended to catch more insects on warm nights than did the male bats.
Wrong. This does not explain how the bats know whether the outside night is warm or cool.
(B) Eastern pipistrelle bats can detect changes in barometric pressure within the caves that correlate closely with changes in temperature outside the caves.
Correct. If bats can detect pressure changes inside the cave that correspond to outside temperature, then they can tell when warm nights are likely. That explains why more bats leave on warm nights, when more insects are available.
(C) Eastern pipistrelle bats are incapable of long periods of sustained activity outside the roosting caves on very cool spring and fall evenings.
Tempting, but incomplete. This explains why cool nights are bad for activity, but it does not explain how bats inside a cave with stable temperature know whether the outside is cool.
(D) Because of the long period of winter inactivity, eastern pipistrelle bats tend to consume more insects per day in the spring and fall than in the summer.
Wrong. This compares seasons, not warm nights versus cool nights within spring and fall.
(E) During the periods in which the researchers studied the bats, on most evenings over half of the bats left the caves in search of food.
Wrong. This does not explain why more bats left on warm nights than on cool nights.
Answer: (B)
