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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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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 monocot develop at ground level, have tiny petals, emit a yeasty aroma, and produce a thick, jellylike nectar. These trails led researchers to suspect that desert rodents such as gerbils pollinate this plant. The researchers trapped rodents in areas where M. depressa grows and checked them for pollen (FIGURE 29.7A,B). They also put some plants in wire cages that excluded mammals, but not insects, to see whether fruits and seeds would form in the absence of rodents (FIGURE 29.7C).

Chapter 29, Problem 3DAA, Whos the Pollinator? Massonia depressa is a low-growing succulent plant native to the desert of , example  1

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.

Chapter 29, Problem 3DAA, Whos the Pollinator? Massonia depressa is a low-growing succulent plant native to the desert of , example  2

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?

Summary Introduction

To compare: The average number of seeds produced by caged plants with that of control plants.

Concept introduction: Pollination takes place with the help of pollinating agents such as by wind or animal. Pollinators are the animal pollination vectors. The pollen, nectar, and other rewards are used by the plants to attract the pollinators. A plant called Massonia depressa is a low-growing moist plant that is commonly found in the semi-desert of South Africa. The researchers believed that gerbils are found to pollinate Massonia depressa plant.

Explanation

In order to confirm that the rodents are the main pollinators of M. depressa plant, they captured 13 rodents and checked for pollen on their snout and in the feces. Refer Fig. 29.7C, “Fruit and seed production of M. depressa with and without visits by mammals” in the textbook.  The researchers placed some plants in wire cages without the mammals in order to observe whether the fruits and seeds are formed in the absence of rodents...

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