BIOLOGY
4th Edition
ISBN: 9781266739606
Author: Hoefnagels
Publisher: MCG
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Textbook Question
Chapter 24, Problem 6WIO
If fruit production is a measure of fitness, why wouldn’t a plant spend all of its energy producing fruits instead of roots and leaves? Why do you think some annual plants die back as they produce fruits?
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Tobacco plants invest a lot of resources into the production of secondary compounds
know as alkaloids (e.g., nicotine) that we believe act as defenses against herbivores.
The researchers did an experiment where they added a hormone that reduces the
production of alkaloids. In graph (a), the data show that the hormone reduced the
proportion of alkaloids as a function of leaf mass relative to controls- so the hormone
worked. They also measured the lifetime seed production of the plants in both
treatments without any herbivores present (b). They had the following results. What
might you conclude/hypothesize/investigate based on the data in graph (b)
(a)
Chemical defenses
(percent of leaf mass)
1.8%
1.4
1.0
0.6
0.2
No hormone added
Hormone added
(b)
Lifetime seed mass
(g/plant)
-18
14
10
No hormone added Hormone added
It would be good to test whether the hormone is very specific or whether it might also
cause changes in other metabolic processes
The hormone has no effect on the lifetime…
Theophrastus of Lesbos, Aristotle’s successor as head of the Lyceum, improved upon Aristotle’s botany by classifying all dicotyledons as flowering plants with:
two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5
one seed-leaf in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5
one seed-leaf in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6
two seed-leaves in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6
two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 3 or 6
Imagine that you are a member of a research group conducting research on fruit type and seed dispersal. Your group has submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document.Question: Why is seed dispersal important in the life of plants? What would be the consequences of having seeds that simply fell to the ground underneath the parent tree?
Chapter 24 Solutions
BIOLOGY
Ch. 24.1 - What adaptations contribute to the reproductive...Ch. 24.1 - Prob. 2MCCh. 24.1 - Prob. 3MCCh. 24.1 - Describe alternation of generations In the plant...Ch. 24.2 - Prob. 1MCCh. 24.2 - Prob. 2MCCh. 24.2 - Prob. 3MCCh. 24.2 - Prob. 4MCCh. 24.2 - Prob. 5MCCh. 24.3 - Prob. 1MC
Ch. 24.3 - Prob. 2MCCh. 24.3 - Prob. 3MCCh. 24.4 - Prob. 1MCCh. 24.4 - Prob. 2MCCh. 24.4 - List the major classes of plant hormones, and name...Ch. 24.4 - Prob. 4MCCh. 24.5 - Prob. 1MCCh. 24.5 - Prob. 2MCCh. 24.5 - How does phytochrome help regulate seed...Ch. 24.5 - How do long-day plants differ from short-day...Ch. 24.6 - Prob. 1MCCh. 24.6 - Prob. 2MCCh. 24.7 - Prob. 1MCCh. 24.7 - Prob. 2MCCh. 24.8 - What did Tewksbury and Nabhan conclude about the...Ch. 24.8 - Prob. 2MCCh. 24 - Prob. 1MCQCh. 24 - Prob. 2MCQCh. 24 - What are the pro ducts of double fertilization? a....Ch. 24 - Prob. 4MCQCh. 24 - Prob. 5MCQCh. 24 - Prob. 1WIOCh. 24 - Describe the male and female gametophytes of...Ch. 24 - How does an exclusive relationship between a plant...Ch. 24 - Prob. 4WIOCh. 24 - Prob. 5WIOCh. 24 - If fruit production is a measure of fitness, why...Ch. 24 - Explain how plants grow toward light. Why is this...Ch. 24 - Prob. 8WIOCh. 24 - Prob. 9WIOCh. 24 - Prob. 10WIOCh. 24 - Prob. 1PITCh. 24 - Prob. 2PIT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Theophrastus of Lesbos, Aristotle’s successor as head of the Lyceum, improved upon Aristotle’s botany by classifying all monocotyledons as flowering plants with: two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5 one seed-leaf in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5 one seed-leaf in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6 two seed-leaves in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6 two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 3 or 6arrow_forwardWhat is the purpose of the fruit we (and other animals) eat, from the plant's perspective? Group of answer choices To create something attractive to pollinators. To create a food item that ensures humans will continue to farm them. To bring in more than one type of pollinator. To entice us to eat the seeds contained inside the fruit, and thus disperse the seeds.arrow_forwardWhat adaptation do seed plants have in addition to the seed that is not found in seedless plants? a. gametophytes b. vascular tissue c. pollen d. chlorophyllarrow_forward
- In flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesarrow_forwardName four major ways human societies rely on seed plants.arrow_forwardImagine that you are a member of a research group conducting research on fruit type and seed dispersal. Your group has submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document.Unit 8 DQ Question: Why is seed dispersal important in the life of plants? What would be the consequences of having seeds that simply fell to the ground underneath the parent tree? (Editor’s note: addressing this question will provide needed background information to the ‘Introduction’ of your paper).arrow_forward
- What is the evolutionary trend in the alternation of generation in plants? Elaborate on the adaptive advantage of this trend.arrow_forwardIn insectivorous plants, what part or parts of the plants evolved to make them insectivorous (pitcher plants, sundew, bladder worts)?arrow_forwardIn the life cycle of the conifer tree, what TWO structures represent the GAMETOPHYTES of the conifer? Select BOTH. Seeds Pollen grains Pine cone Megaspores Ovule sacs Microsporesarrow_forward
- In angiosperms, what is the function of fruit? Question 72 options: It is a mechanism for the dispersal of seeds. It attracts pollinators. It is where the male gametophyte develops. It provides nutrients to germinating seeds.arrow_forwardCompare wind-pollinated and animal pollinated seed vascular plants in terms of the following characteristics: -Pollination method -Relative efficiency of pollination method -Plant types -Reproductive organs -Adaptations that promote pollination. Tabulate your answersarrow_forwardMost angiosperms incorporate the assistance of animals in their reproductive cycle. This is a major advancement that gave them an advantage over other plant lineages and helped them become the dominant type of plant on Earth today. Which of the following steps in the reproduction of angiosperms do animals assist with? Check all that apply. Pollination Fertilization Seed dispersalarrow_forward
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