GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 18 Jan 2019, 07:54

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### Free GMAT Strategy Webinar

January 19, 2019

January 19, 2019

07:00 AM PST

09:00 AM PST

Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
• ### FREE Quant Workshop by e-GMAT!

January 20, 2019

January 20, 2019

07:00 AM PST

07:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# Species interdependence in nature confers many benefits on t

Author Message
TAGS:

### Hide Tags

Intern
Joined: 01 Aug 2014
Posts: 43
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

04 Jan 2016, 20:48
2. According to the author, a flowering plant species whose fecundity has declined due to pesticide spraying may not experience an overall population decline if the plant species can do which of the following?
(A) Reproduce itself by means of shoots and runners.
" on the other hand, vegetative growth and dispersal (by means of shoots or runners) are available as alternative reproductive strategies for a species, then decreases in plant fecundity"

3. The passage suggests that the lack of an observed decline in the fecundity of the creeping dogwood strengthens the researchers conclusions regarding pesticide use because the
(D) creeping dogwood is similar to the red-osier dogwood, but its insect pollinators are known to be insensitive to the pesticide used in the study
"The creeping dogwood, a species similar to the red-osier dogwood, but which is pollinated by large bees, such as bumblebees, showed no significant decline in fecundity."

4. The passage suggests that which of the following is true of the forest regions in New Brunswick sprayed with most anti-budworm pesticides other than Matacil?
(A) The fecundity of some flowering plants in those regions may have decreased to an even greater degree than in the regions where Matacil is used.
"New Brunswick various pesticides have been sprayed in the past 25 years ; Matacil, one of the anti-budworm agents that is least toxic to insect-pollinators."

5. It can be inferred that which of the following is true of plant fecundity as it is defined in the passage?
(A) A plant's fecundity decreases as the percentage of unpollinated flowers on the plant increases.
" flowering plant species dependent on insect pollination could be endangered when the population of insect-pollinators is depleted by the use of pesticides." It means that unpollinated flowers increase will lead to the decreasing in number of plant (fecundity).

(C) A plant's fecundity increases as the number of flowers produced by the plant increases.
"It maybe true but the reproduction of many other plants depend on shoots or runners." So choice A is much clearer.

6. It can be inferred from the passage that which of the following plant species would be LEAST likely to experience a decrease in fecundity as a result of the spraying of a pesticide not directly toxic to plants?
(C) A wind-pollinated flowering tree that is short-lived
" Thus, flowering plant species dependent on insect pollination, as opposed to self-pollination or wind pollination, could be endangered when the population of insect-pollinators is depleted by the use of pesticides." It means that wind pollination may have not negative impacts by the use of pesticides.

(E) A type of wildflower typically pollinated by larger insects.
"The creeping dogwood, a species similar to the red-osier dogwood, but which is pollinated by large bees, such as bumblebees, showed no significant decline in fecundity."

7. Which of the following assumptions most probably underlies the author's tentative recommendation in lines 51-54?
(A) Human activities that result in environmental disruption should be abandoned.
(B) The use of pesticides is likely to continue into the future.
I think we can easily remove choice C, D and E since there is no information related to cost in the last sentence of the passage.
Choice A uses the word "abandoned", which did not appear in the sentence, and the author only warn people to pay attention to the use of pesticides.
"pay attention to the use of pesticides." It implies that there is no regulation to stop using pesticides, or using pesticides may continue to use.
Choice B correct.
Manager
Joined: 24 Jul 2016
Posts: 51
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

07 Apr 2017, 12:29
I am really Confused about qn 4 :/
Senior Manager
Joined: 29 Jun 2017
Posts: 457
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

18 Jul 2017, 02:22
nitya34 wrote:
Species interdependence in nature confers many benefits on the species involved, but it can also become a point of weakness when one species involved in the relationship is affected by a catastrophe. Thus, flowering plant species dependent on insect pollination, as opposed to self-pollination or wind pollination, could be endangered when the population of insect-pollinators is depleted by the use of pesticides.

In the forests of New Brunswick, for example, various pesticides have been sprayed in the past 25 years in efforts to control the spruce budworm, an economically significant pest. Scientists have now investigated the effects of the spraying of Matacil, one of the anti-budworm agents that is least toxic to insect-pollinators. They studied Matacil’s effects on insect mortality in a wide variety of wild insect species and on plant fecundity, expressed as the percentage of the total flowers on an individual plant that actually developed fruit and bore seeds. They found that the most pronounced mortality after the spraying of Matacil occurred among the smaller bees and one family of flies, insects that were all important pollinators of numerous species of plants growing beneath the tree canopy of forests. The fecundity of plants in one common indigenous species, the red-osier dogwood, was significantly reduced in the sprayed areas as compared to that of plants in control plots where Matacil was not sprayed. This species is highly dependent on the insect-pollinators most vulnerable to Matacil. The creeping dogwood, a species similar to the red-osier dogwood, but which is pollinated by large bees, such as bumblebees, showed no significant decline in fecundity. Since large bees are not affected by the spraying of Matacil, these results add weight to the argument that spraying where the pollinators are sensitive to the pesticide used decreases plant fecundity.

The question of whether the decrease in plant fecundity caused by the spraying of pesticides actually causes a decline in the overall population of flowering plant species still remains unanswered. Plant species dependent solely on seeds for survival or dispersal are obviously more vulnerable to any decrease in plant fecundity that occurs, whatever its cause. If, on the other hand, vegetative growth and dispersal (by means of shoots or runners) are available as alternative reproductive strategies for a species, then decreases in plant fecundity may be of little consequence. The fecundity effects described here are likely to have the most profound impact on plant species with all four of the following characteristics: a short life span, a narrow geographic range, an incapacity for vegetative propagation, and a dependence on a small number of insect-pollinator species. Perhaps we should give special attention to the conservation of such plant species since they lack key factors in their defenses against the environmental disruption caused by pesticide use.
1. Which of the following best summarizes the main point of the passage?
(A) Species interdependence is a point of weakness for some plants, but is generally beneficial to insects involved in pollination.
(B) Efforts to control the spruce budworm have had deleterious effects on the red-osier dogwood.
(C) The used of pesticides may be endangering certain plant species dependent on insects for pollination.
(D) The spraying of pesticides can reduce the fecundity of a plant species, but probably does not affect its overall population stability.
(E) Plant species lacking key factors in their defenses against human environmental disruption will probably become extinct.

2. According to the author, a flowering plant species whose fecundity has declined due to pesticide spraying may not experience an overall population decline if the plant species can do which of the following?
(A) Reproduce itself by means of shoots and runners.
(B) Survive to the end of the growing season.
(C) Survive in harsh climates.
(D) Respond to the fecundity decline by producing more flowers.
(E) Attract large insects as pollinators.

3. The passage suggests that the lack of an observed decline in the fecundity of the creeping dogwood strengthens the researchers conclusions regarding pesticide use because the
(A) creeping dogwood is a species that does not resemble other forest plants
(B) creeping dogwood is a species pollinated by a broader range of insect species than are most dogwood species
(C) creeping dogwood grows primarily in regions that were not sprayed with pesticide, and so served as a control for the experiment
(D) creeping dogwood is similar to the red-osier dogwood, but its insect pollinators are known to be insensitive to the pesticide used in the study
(E) geographical range of the creeping dogwood is similar to that of the red-osier dogwood, but the latter species relies less on seeds for reproduction

4. The passage suggests that which of the following is true of the forest regions in New Brunswick sprayed with most anti-budworm pesticides other than Matacil?
(A) The fecundity of some flowering plants in those regions may have decreased to an even greater degree than in the regions where Matacil is used.
(B) Insect mortality in those regions occurs mostly among the larger species of insects, such as bumblebees.
(C) The number of seeds produced by common plant species in those regions is probably comparable to the number produced where Matacil is sprayed.
(D) Many more plant species have become extinct in those regions than in the regions where Matacil is used.
(E) The spruce budworm is under better control in those regions than in the regions where Matacil is sprayed.

5. It can be inferred that which of the following is true of plant fecundity as it is defined in the passage?
(A) A plant’s fecundity decreases as the percentage of unpollinated flowers on the plant increases.
(B) A plant’s fecundity decreases as the number of flowers produced by the plant decreases.
(C) A plant’s fecundity increases as the number of flowers produced by the plant increases.
(D) A plant’s fecundity is usually low if the plant relies on a small number of insect species for pollination.
(E) A plant’s fecundity is high if the plant can reproduce quickly by means of vegetative growth as well as by the production of seeds.

6. It can be inferred from the passage that which of the following plant species would be LEAST likely to experience a decrease in fecundity as a result of the spraying of a pesticide not directly toxic to plants?
(A) A flowering tree pollinated by only a few insect species
(B) A kind of insect-pollinated vine producing few flowers
(C) A wind-pollinated flowering tree that is short-lived
(D) A flowering shrub pollinated by a large number of insect species
(E) A type of wildflower typically pollinated by larger insects

7. Which of the following assumptions most probably underlies the author’s tentative recommendation in lines 51-54?
(A) Human activities that result in environmental disruption should be abandoned.
(B) The use of pesticides is likely to continue into the future.
(C) It is economically beneficial to preserve endangered plant species.
(D) Preventing the endangerment of a species is less costly than trying to save an already endangered one.
(E) Conservation efforts aimed at preserving a few well-chosen species are more cost-effective than are broader-based efforts to improve the environment.

pls explain, why choice D in question 1 is wrong. pls help
VP
Status: Learning
Joined: 20 Dec 2015
Posts: 1041
Location: India
Concentration: Operations, Marketing
GMAT 1: 670 Q48 V36
GRE 1: Q157 V157
GPA: 3.4
WE: Engineering (Manufacturing)
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

18 Jul 2017, 07:48
A very good challenging passage .
Got all correct except question 1 .
_________________

Manager
Joined: 28 Jan 2015
Posts: 75
Location: India
Concentration: Marketing, Entrepreneurship
GPA: 3.7
WE: Information Technology (Internet and New Media)
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

20 Sep 2017, 04:15
for the question 4 my explanation is --''The fecundity of plants in one common indigenous species, the red-osier dogwood, was significantly reduced in the sprayed areas as compared to that of plants in control plots where Matacil was not sprayed" thats the indication to greater degree...

question no 5 & question no 6 ??
Director
Joined: 09 Mar 2017
Posts: 522
Location: India
Concentration: Marketing, Organizational Behavior
WE: Information Technology (Computer Software)
Re: Species interdependence in nature confers many benefits on t  [#permalink]

### Show Tags

27 Aug 2018, 03:43
Very well formulated inference questions and a good exercise for practice.
All but one correct.

Posted from my mobile device
_________________

------------------------------
"Trust the timing of your life"
Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq

Re: Species interdependence in nature confers many benefits on t &nbs [#permalink] 27 Aug 2018, 03:43

Go to page   Previous    1   2   [ 26 posts ]

Display posts from previous: Sort by