|
Author |
Message |
|
TAGS:
|
|
|
Manager
Joined: 26 Jul 2004
Posts: 63
Followers: 1
Kudos [?]:
0
[0], given: 0
|
To many environmentalists, the extinction of plants [#permalink]
 24 Aug 2004, 16:01
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
To many environmentalists, the extinction of plants – accompanied by the increasing genetic uniformity of species of food crops - is the single most serious environmental problem. Something must be done to prevent the loss of wild food plants or no-longer-cultivated food plants. Otherwise, the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight. In 1970, for example, southern leaf blight destroyed approximately 20 percent of the United States corn crop, leaving very few varieties of corn unaffected in the areas over which the disease had spread.
Which of the following can be inferred from the passage above?
A. Susceptibility to certain plant diseases is genetically determined.
B. Eight percent of the corn grown in the United States is resistant to southern leaf blight.
C. The extinction of wild food plants can in almost every case be traced to destructive plant diseases.
D. Plant breeders focus on developing plants that are resistant to plant disease.
E. Corn is the only food crop threatened by southern leaf blight.
|
|
|
|
|
|
|
Manager
Joined: 21 Jul 2004
Posts: 151
Followers: 1
Kudos [?]:
0
[0], given: 0
|
a???
|
|
|
|
|
|
Senior Manager
Joined: 02 Jul 2004
Posts: 258
Followers: 1
Kudos [?]:
1
[0], given: 0
|
A
It is clear from the passage that genetic uniformity is a danger to crops because they can be destroyed quickly. This suggests that plants are genetically susceptable to certain deseases
|
|
|
|
|
|
SVP
Joined: 16 Oct 2003
Posts: 1957
Followers: 2
Kudos [?]:
14
[0], given: 0
|
A.
What I understand from the passage if that genetic diversity is necessary to prevent crop from extinction.
|
|
|
|
|
|
Senior Manager
Joined: 25 Jul 2004
Posts: 296
Followers: 1
Kudos [?]:
3
[0], given: 0
|
Clear A.
|
|
|
|
|
|
Senior Manager
Joined: 22 Jun 2004
Posts: 399
Location: Bangalore, India
Followers: 1
Kudos [?]:
1
[0], given: 0
|
Re: CR: Extinction of plants [#permalink]
25 Aug 2004, 11:09
I am getting it as A.
The stem says "the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight.". Thus, A is loical inference.
kedar1972 wrote: To many environmentalists, the extinction of plants – accompanied by the increasing genetic uniformity of species of food crops - is the single most serious environmental problem. Something must be done to prevent the loss of wild food plants or no-longer-cultivated food plants. Otherwise, the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight. In 1970, for example, southern leaf blight destroyed approximately 20 percent of the United States corn crop, leaving very few varieties of corn unaffected in the areas over which the disease had spread.
Which of the following can be inferred from the passage above?
A. Susceptibility to certain plant diseases is genetically determined.
B. Eight percent of the corn grown in the United States is resistant to southern leaf blight.
C. The extinction of wild food plants can in almost every case be traced to destructive plant diseases.
D. Plant breeders focus on developing plants that are resistant to plant disease.
E. Corn is the only food crop threatened by southern leaf blight.
_________________
Awaiting response,
Thnx & Rgds,
Chandra
|
|
|
|
|
|
VP
Joined: 13 Nov 2003
Posts: 1031
Location: Florida
Followers: 1
Kudos [?]:
5
[0], given: 0
|
agree A
|
|
|
|
|
|
Senior Manager
Joined: 16 Aug 2004
Posts: 343
Location: India
Followers: 1
Kudos [?]:
29
[0], given: 0
|
My option is choice A
|
|
|
|
|
|
Manager
Joined: 26 Jul 2004
Posts: 63
Followers: 1
Kudos [?]:
0
[0], given: 0
|
OA is A. Thanks for all the explanations
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Moderators:
metallicafan, rajeevrks27, souvik101990, PTK, MacFauz, noboru, kissthegmat, carcass, willigetmylifeback, mikemcgarry, doe007, Vercules, Legendaddy, tuanquang269, RaviChandra, Marcab, Narenn
|
close
