• Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    PrepScholar GMAT
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    e-gmat Exclusive Offer
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    Varsity Tutors
  • Economist Test Prep
    Free Trial & Practice Exam

    Available with Beat the GMAT members only code

    Economist Test Prep
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    Veritas Prep
  • EMPOWERgmat Slider
    1 Hour Free

    Available with Beat the GMAT members only code

    EMPOWERgmat Slider
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    Target Test Prep
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    Kaplan Test Prep

OG Resin is a plant secretion that hardens

This topic has 1 member reply
AbeNeedsAnswers Master | Next Rank: 500 Posts Default Avatar
02 Jul 2017
191 messages
Followed by:
2 members

OG Resin is a plant secretion that hardens

Post Sat Aug 19, 2017 2:03 pm
Resin is a plant secretion that hardens when exposed to air; fossilized resin is called amber. Although Pliny in the first century recognized that amber was produced from “marrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks. Confusion also persists surrounding the term “resin,” which was defined before rigorous chemical analyses were available. Resin is often confused with gum, a substance produced in plants in response to bacterial infections, and with sap, an aqueous solution transported through certain plant tissues. Resin differs from both gum and sap in that scientists have not determined a physiological function for resin.

In the 1950s, entomologists posited that resin may function to repel or attract insects. Fraenkel conjectured that plants initially produced resin in nonspecific chemical responses to insect attack and that, over time, plants evolved that produced resin with specific repellent effects. But some insect species, he noted, might overcome the repellent effects, actually becoming attracted to the resin. This might induce the insects to feed on those plants or aid them in securing a breeding site. Later researchers suggested that resin mediates the complex interdependence, or “coevolution,” of plants and insects over time. Such ideas led to the development of the specialized discipline of chemical ecology, which is concerned with the role of plant chemicals in interactions with other organisms and with the evolution and ecology of plant antiherbivore chemistry (plants' chemical defenses against attack by herbivores such as insects).

467) According to the passage, which of the following is true of plant antiherbivore chemistry?
(A) Changes in a plant's antiherbivore chemistry may affect insect feeding behavior.
(B) A plant's repellent effects often involve interactions between gum and resin.
(C) A plant's antiherbivore responses assist in combating bacterial infections.
(D) Plant antiherbivore chemistry plays only a minor role in the coevolution of plants and insects.
(E) Researchers first studied repellent effects in plants beginning in the 1950s.

468) Of the following topics, which would be most likely to be studied within the discipline of chemical ecology as it is described in the passage?
(A) Seeds that become attached to certain insects, which in turn carry away the seeds and aid in the reproductive cycle of the plant species in question
(B) An insect species that feeds on weeds detrimental to crop health and yield, and how these insects might aid in agricultural production
(C) The effects of deforestation on the life cycles of subtropical carnivorous plants and the insect species on which the plants feed
(D) The growth patterns of a particular species of plant that has proved remarkably resistant to herbicides
(E) Insects that develop a tolerance for feeding on a plant that had previously been toxic to them, and the resultant changes within that plant species

469) The author refers to “bacterial infections” (see line 11) most likely in order to
(A) describe the physiological function that gum performs in plants
(B) demonstrate that sap is not the only substance that is transported through a plant's tissues
(C) explain how modern chemical analysis has been used to clarify the function of resin
(D) show that gum cannot serve as an effective defense against herbivores
(E) give an example of how confusion has arisen with regard to the nature of resin

470) The author of the passage refers to Pliny most probably in order to
(A) give an example of how the nature of amber has been misunderstood in the past
(B) show that confusion about amber has long been more pervasive than confusion about resin
(C) make note of the first known reference to amber as a semiprecious gem
(D) point out an exception to a generalization about the history of people's understanding of amber
(E) demonstrate that Pliny believed amber to be a mineral

Q467: A
Q468: E
Q469: A
Q470: D

  • +1 Upvote Post
  • Quote
  • Flag
Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!

Top Member

NandishSS Master | Next Rank: 500 Posts Default Avatar
05 Jun 2015
313 messages
Followed by:
1 members
Most Conversational Member
Post Wed Sep 20, 2017 9:39 pm
Hi Experts,

Can somebody pls explain que 1 and 2?


  • +1 Upvote Post
  • Quote
  • Flag

Best Conversation Starters

1 Roland2rule 165 topics
2 lheiannie07 110 topics
3 ardz24 60 topics
4 Vincen 50 topics
5 LUANDATO 49 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description Brent@GMATPrepNow

GMAT Prep Now Teacher

150 posts
2 image description GMATGuruNY

The Princeton Review Teacher

125 posts
3 image description Jeff@TargetTestPrep

Target Test Prep

120 posts
4 image description Rich.C@EMPOWERgma...


116 posts
5 image description Scott@TargetTestPrep

Target Test Prep

100 posts
See More Top Beat The GMAT Experts