Concept explainers
Who’s the Pollinator? Massonia depressa is a low-growing succulent plant native to the desert of South Africa. The dull-colored flowers of this
A The dull petalless, ground-level flower of Massonia depressa are accessible to rodents, who push their heads through the stamens to reach the nectar at the bottom of floral cups. Note the pollen on the gerbil’s snout.
B Evidence of visits to M. depressa by rodents.
Mammals allowed access to plants | Mammals excluded from plants | |
Percent of plants that set fruit | 30.4 | 4.3 |
Average number of fruits per pant | 1.39 | 0.47 |
Average number of seeds per plant | 20.0 | 1.96 |
C Fruit and seed production of M. depressa with and without visits by mammals. Mammals were excluded from plants by wire cages with openings large enough for insects to pass through. Twenty-three plants were tested in each group.
FIGURE 29.7 Testing pollination of M. depressa by rodents.
How did the average number of seeds of produced by caged plants compare with that of control plants?
Want to see the full answer?
Check out a sample textbook solutionChapter 29 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Additional Science Textbook Solutions
Biological Science (6th Edition)
Genetics: From Genes to Genomes
Campbell Essential Biology (7th Edition)
HUMAN ANATOMY
Biology: Life on Earth with Physiology (11th Edition)
- 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…arrow_forwardWhat preliminary conclusions can you draw from the results of the experiment and what is the independent and dependent variable ?arrow_forwardA team of researchers investigated the effects of phosphorous availability and light intensity on an angiosperm species. Seeds of the angiosperm were divided into four equal groups. Groups 1 and 2 were exposed to 200 μmol, and Groups 3 and 4 were exposed to 500 μmol. Groups 2 and 4 also received a phosphorous (P) solution. After 20 days, all plants were weighed, and the average dry weight of each group was calculated. The results are in the table below. Group 1(200 μmol, no P) Group 2(200 μmol, + P) Group 3 (500 μmol, no P) Group 4 (500 μmol + P) Average Dry weight (g) 0.8 1.1 1.5 6.2 Describe the effects of light and phosphorous on the growth of the plants in this study. Explain how the metabolic processes associated with the plant kingdom likely influenced these results.arrow_forward
- Phytochrome, plays an important role in flowering in many plants. It can also be used to determine when lettuce seeds germinate (shown in the figure below Which scenario(s) above produce large amounts of the active form of phytochrome? A B A & C B & Darrow_forwardi beg please helppparrow_forwardA team of researchers investigated the effects of phosphorous availability and light intensity on an angiosperm species. Seeds of the angiosperm were divided into four equal groups. Groups 1 and 2 were exposed to 200 pmol, and Groups 3 and 4 were exposed to 500 umol. Groups 2 and 4 also received a phosphorous (P) solution. After 20 days, all plants were weighed, and the average dry weight of each group was calculated. The results are in the table below. Group 1(200 pmol, Group 2(200 umol, Group 3 (500 umol, Group 4 (500 pmol no P) no P) +P) Average Dry weight (g) Describe the effects of light and phosphorous on the growth of the plants in this study. Explain how the metabolic processes associated with the plant kingdom likely influenced these results. 10.8 1.5 6.2arrow_forward
- Explanationarrow_forwardHello , Happy New Year. I do hope that you can help me about this. This is my report regarding biology. It needs parameters and observation. Thank you in advance ❤️arrow_forwardAloes vs. Agaves Now, identify a specific example -- 1 Aloe species and 1 Agave species -- that look especially similar. List their names and clearly describe how they are alike.arrow_forward
- What is the conclusion?arrow_forwardIn the Kotukutuku plant, Fuchsia excortiata, why do pollinated flowers remain attached to the plant for several days after pollination occurs and nectar is no longer produced Size of flower and pollination Annual versus perennial reproduction Time and expense to grow the pollen tube outweighs the cost of maintaining the flower on the tree Size of flower and number of flowers on inflorescencearrow_forwardPlease answer question 1arrow_forward
- Biology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781337408332Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning