On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement. The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them. Which of the following contributes most to an explanation of the difference between gecko populations in urban and rural areas?
A. In urban areas, geckos are valued because they eat so many insects.
B. Geckos defend territories against other members of the same species.
C. House geckos that arrive on islands are carried there in boats and planes.
D. In places where there are lighted buildings, insects tend to gather around the light.
E. Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually.
[spoiler]OA: Will be posted later. Please discuss each answer choice[/spoiler]
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
On Pacific islands, a newly arrived
This topic has expert replies
-
aspirant2011
- Legendary Member
- Posts: 1574
- Joined: Fri Jan 28, 2011 2:52 am
- Thanked: 88 times
- Followed by:13 members
-
aspirant2011
- Legendary Member
- Posts: 1574
- Joined: Fri Jan 28, 2011 2:52 am
- Thanked: 88 times
- Followed by:13 members
-
sourabh33
- Master | Next Rank: 500 Posts
- Posts: 135
- Joined: Tue Mar 22, 2011 12:01 pm
- Thanked: 21 times
- Followed by:3 members
- GMAT Score:720
IMO D
The question asks to identify an option that contributes most to an explanation of the difference between gecko populations in urban and rural areas.
In rural areas ---> no lighted buildings ---> no gathering (congregation) of insects around lights ---> House gecko not stopping M gecko feeding on insects ---> probably no starving of M gecko ---> stable population
In urban areas ---> lighted buildings ---> gathering (congregation) of insects around lights ---> House gecko stopping M gecko feeding on insects ---> probably starving of M gecko ---> reducing M gecko population after introduction of H gecko.
The question asks to identify an option that contributes most to an explanation of the difference between gecko populations in urban and rural areas.
In rural areas ---> no lighted buildings ---> no gathering (congregation) of insects around lights ---> House gecko not stopping M gecko feeding on insects ---> probably no starving of M gecko ---> stable population
In urban areas ---> lighted buildings ---> gathering (congregation) of insects around lights ---> House gecko stopping M gecko feeding on insects ---> probably starving of M gecko ---> reducing M gecko population after introduction of H gecko.
-
HSPA
- Legendary Member
- Posts: 1101
- Joined: Fri Jan 28, 2011 7:26 am
- Thanked: 47 times
- Followed by:13 members
- GMAT Score:640
aspirant2011 wrote:On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement. The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them. Which of the following contributes most to an explanation of the difference between gecko populations in urban and rural areas?
A. In urban areas, geckos are valued because they eat so many insects.[Urban geckos are almost used as pets - wrong]
B. Geckos defend territories against other members of the same species.{match color code in stem}
C. House geckos that arrive on islands are carried there in boats and planes.[very big OOS]
D. In places where there are lighted buildings, insects tend to gather around the light.
E. Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually. Out of scope .
[spoiler]OA: Will be posted later. Please discuss each answer choice[/spoiler]
First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.
Second take: coming soon..
Regards,
HSPA.
-
aspirant2011
- Legendary Member
- Posts: 1574
- Joined: Fri Jan 28, 2011 2:52 am
- Thanked: 88 times
- Followed by:13 members
