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Galapagos tortoise

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Galapagos tortoise

by real2008 » Fri Jun 05, 2009 9:29 am
161. Based on the growth rates of large modern reptiles such as the Galapagos tortoise and examinations of fossils of juvenile dinosaurs, scientists estimate that the largest dinosaurs probably lived to be between 100 and 200 years old.

(A) Based on the growth rates of large modern reptiles such as
(B) On the basis of growth rates of large modern reptiles such as
(C) Based on the growth rates of large modern reptiles like
(D) On the basis of growth rates of large modern reptiles, like those of
(E) Based on such growth rates as those of large modern reptiles like

why the answer is B not A?

anybody pl explain....
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by rs2010 » Fri Jun 05, 2009 3:21 pm
Based on here means account of. Despite using correct idiom it does not make sense. You should go for logical flow of sentence first and then rest of the things.
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by SanjeevK » Sat Jun 06, 2009 2:11 am
Option A suggests that the scientists are based on the growth rates of large modern reptiles such as the Galapagos tortoise and examinations of fossils of juvenile dinosaurs

Option B corrects this by telling that on the basis of growth rates of large modern reptiles such as ....., scientists estimate that ...

Hope this clarifies the issue
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by lily164 » Sat Jun 06, 2009 10:05 am
In option A, C, D: The verb "based" refers to scientists, but we can't use passive voice for subject "scientists" in this case. So A,C,D wrong.
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by real2008 » Sat Jun 06, 2009 10:18 am
lily164 wrote:In option A, C, D: The verb "based" refers to scientists, but we can't use passive voice for subject "scientists" in this case. So A,C,D wrong.
sorry, i haven't got your idea. would you please elaborate?
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by Domnu » Sat Jun 06, 2009 12:29 pm
Hmm.. this is slightly tricky. However, it does make sense. For example, take a look at this sentence (which is clearly incorrect)...


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by uptowngirl92 » Tue Oct 20, 2009 4:44 pm
Sorry guys can't make out why A is incorrect.How is BASED ON modifying scientists??
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by sarthak » Tue Mar 02, 2010 10:21 am
thumb rule I use is if based on is used at the beginning of a sentence to introduce a clause then that option is wrong. (Please do nt ask me why).

Can anyone suggest if this is right ?

P.S. While forming the question above I had a doubt , wheter it will be suggest or suggests ? :shock:
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by kstv » Wed Mar 03, 2010 2:46 am
I am equally confused. Is Parallelism a issue here.

In the correct part of the sentence it is given examinations of fossils so is it that On the basis of growth rates is better than Based on the growth rates

Based on the growth rates of large modern reptiles such as the Galapagos tortoise and examinations of fossils of juvenile dinosaurs, scientists estimate that the largest dinosaurs probably lived to be between 100 and 200 years old.

(A) Based on the growth rates of large modern reptiles such as
(B) On the basis of growth rates of large modern reptiles such as
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by harshavardhanc » Wed Mar 03, 2010 4:36 am
kstv wrote:I am equally confused. Is Parallelism a issue here.

In the correct part of the sentence it is given examinations of fossils so is it that On the basis of growth rates is better than Based on the growth rates

Based on the growth rates of large modern reptiles such as the Galapagos tortoise and examinations of fossils of juvenile dinosaurs, scientists estimate that the largest dinosaurs probably lived to be between 100 and 200 years old.

(A) Based on the growth rates of large modern reptiles such as
(B) On the basis of growth rates of large modern reptiles such as
wow ! this topic got bumped up after 5 months!

Anyway, here's my two cents :)

rule says:

modifying clause, modified noun i.e the noun which is being modified should follow the comma after the clause.

so, according to the rule, A says : scientists were based on X.

Doesn't make sense.... right?

whereas it was scientists' estimation that was based on X. A would have been right if it said:

Based on the growth rates, scientists' estimation......


B clears this confusion by keeping the modified noun as the scientists and properly modifying it using " on the basis of".

On the basis of X, scientists....
Regards,
Harsha
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by tomada » Wed Mar 03, 2010 1:50 pm
On the basis of Harsha's explanation, I have a better understanding of the answer.
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