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By the end of this section, you will be able to:
  • Explain how angiosperm diversity is due, in part, to multiple interactions with animals
  • Describe ways in which pollination occurs
  • Discuss the roles that plants play in ecosystems and how deforestation threatens plant biodiversity

Without seed plants, life as we know it would not be possible. Plants play a key role in the maintenance of terrestrial ecosystems through stabilization of soils, cycling of carbon, and climate moderation. Large tropical forests release oxygen and act as carbon dioxide sinks. Seed plants provide shelter to many life forms, as well as food for herbivores, thereby indirectly feeding carnivores. Plant secondary metabolites are used for medicinal purposes and industrial production.

Animals and plants: herbivory

Coevolution of flowering plants and insects is a hypothesis that has received much attention and support, especially because both angiosperms and insects diversified at about the same time in the middle Mesozoic. Many authors have attributed the diversity of plants and insects to pollination and herbivory    , or consumption of plants by insects and other animals. This is believed to have been as much a driving force as pollination. Coevolution of herbivores and plant defenses is observed in nature. Unlike animals, most plants cannot outrun predators or use mimicry to hide from hungry animals. A sort of arms race exists between plants and herbivores. To “combat” herbivores, some plant seeds—such as acorn and unripened persimmon—are high in alkaloids and therefore unsavory to some animals. Other plants are protected by bark, although some animals developed specialized mouth pieces to tear and chew vegetal material. Spines and thorns ( [link] ) deter most animals, except for mammals with thick fur, and some birds have specialized beaks to get past such defenses.

 Photo A shows a green cactus. It is covered in clusters of long, slender spines that are pale white and have visible sharp points. Photo B shows a green fuzzy stem with several short green thorns protruding from it.
(a) Spines and (b) thorns are examples of plant defenses. (credit a: modification of work by Jon Sullivan; credit b: modification of work by I. Sáček, Sr.)

Herbivory has been used by seed plants for their own benefit in a display of mutualistic relationships. The dispersal of fruit by animals is the most striking example. The plant offers to the herbivore a nutritious source of food in return for spreading the plant’s genetic material to a wider area.

An extreme example of collaboration between an animal and a plant is the case of acacia trees and ants. The trees support the insects with shelter and food. In return, ants discourage herbivores, both invertebrates and vertebrates, by stinging and attacking leaf-eating insects.

Animals and plants: pollination

Grasses are a successful group of flowering plants that are wind pollinated. They produce large amounts of powdery pollen carried over large distances by the wind. The flowers are small and wisp-like. Large trees such as oaks, maples, and birches are also wind pollinated.

Explore this website for additional information on pollinators.

More than 80 percent of angiosperms depend on animals for pollination    : the transfer of pollen from the anther to the stigma. Consequently, plants have developed many adaptations to attract pollinators. The specificity of specialized plant structures that target animals can be very surprising. It is possible, for example, to determine the type of pollinator favored by a plant just from the flower’s characteristics. Many bird or insect-pollinated flowers secrete nectar    , which is a sugary liquid. They also produce both fertile pollen, for reproduction, and sterile pollen rich in nutrients for birds and insects. Butterflies and bees can detect ultraviolet light. Flowers that attract these pollinators usually display a pattern of low ultraviolet reflectance that helps them quickly locate the flower's center and collect nectar while being dusted with pollen ( [link] ). Large, red flowers with little smell and a long funnel shape are preferred by hummingbirds, who have good color perception, a poor sense of smell, and need a strong perch. White flowers opened at night attract moths. Other animals—such as bats, lemurs, and lizards—can also act as pollinating agents. Any disruption to these interactions, such as the disappearance of bees as a consequence of colony collapse disorders, can lead to disaster for agricultural industries that depend heavily on pollinated crops.

Questions & Answers

what is a base?
Alice Reply
base can be define as the anatomy of structure
what are somatic cells
KAKU Reply
Somatic cells responsible for making the body
vegetative cells, they divide by mitosis.
what is angiosperms
Papillon Reply
what is the function of bile
what is neurologist
Benjamin Reply
what is a cell
God Reply
is a basic unit of living organism
or a basic building blocks of all living things
explain cell biology
Grace Reply
cell biology is a biology branch which study about function,size,definition ,....of cells.
what are endotherms
angelina Reply
pls can someone elaborate more on biomagnification
Biomagnification, also known as bioamplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.
An endotherm (from Greek ἔνδον endon "within" and θέρμη thermē "heat") is an organism that maintains its body at a metabolically favorable temperature, largely by the use of heat set free by its internal bodily functions instead of relying almost purely on ambient heat.
these are substances that absorbs heat energy
What diffusion
Oseres Reply
it is the movement of water molecules from the region of higher concentretion to a region of lower concentration
is the movement of anything from region of higher concentration to a region of lower concentration.
is a movemnt of H2O molecule from a region of higher concentration to the legion of lower Concentration.
diffusion is the movement of particles from a region of higher concentration to a region of lower concentration resulting into an even distribution
pls I don't know how to read very well so how can I understand all this
Mercy Reply
What's succession
Talabi Reply
an acid is a substance that produces hydrogen ions in an aqueous solution
angelina Reply
how? give a reason to support ur answer
Types of acids and there definitions
what is acid
asaa Reply
An acid is a substance which gives Hydrogen ions in aqueous solutions.
food poison
an acid is a chemical substance that produces or gives out hydrogen ions as the only positively charged ion when dissolved in water
what is salt?
a sait is a substance formed when hydrogen ions in an acid are partially or fully replaced by a metal or ammonium ions
When an acid and base react chemically, a salt is form.
what is nervous system
the difference between prokaryotic cells and Eukaryotic cells
Itz Reply
karyon is nucles eukaryotes have intact membrane around its nucleus, whereas prokaryotes don't have nuclear membrane and other membrane bounded organelles
what is the function of chyme
Divine Reply
what makes a tissue
tell me
chyme where digested food passes from e stomach through e pyloric sphincter in 2 e duodenum.
what is an osmosis
tell me the answer
Osmosis is the movement of the water molecules through a semipermiable membrane from lower to higher concentrated solution.
is the movement of water molecules from the area of high concentration to the area of low concentration through a semi permeable membrane.
what is hypertonic solution
A solution having more solute concentration as compared to a cell which is in place, results shrinkage of cell.
what is water potential
uses of Osmosis
osmosis is the movement of water molecules from a region of low concentration to a region of high concentration tthrough a selective permaeble membrane

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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