Coevolution

What defines coevolution between two species?

• They evolve similar traits independently due to similar environmental pressures.

• One species adapts to changes in its abiotic environment.

• They exert reciprocal selective pressures on each other, leading to joint evolution.

• One species benefits while the other is harmed, driving the evolution of defenses.

Which of the following scenarios best illustrates a mutualistic coevolutionary relationship?

• A predator developing faster speed to catch prey, and the prey evolving to run even faster.

• Insects obtaining nectar from flowers while simultaneously transferring pollen between them.

• Two unrelated marine animals developing streamlined bodies to swim efficiently in water.

• A plant species adapting to colder temperatures by developing thicker bark.

What is a key difference between coevolution and convergent evolution?

• Coevolution involves adaptation to abiotic factors, while convergent evolution involves biotic interactions.

• Convergent evolution results in unrelated species developing similar traits due to similar environmental pressures, whereas coevolution involves two species reciprocally influencing each other's evolution.

• Coevolution always leads to beneficial relationships, while convergent evolution always leads to competitive ones.

• Convergent evolution occurs over short periods, while coevolution requires millions of years.

The rough-skinned newt produces a potent toxin, while the common garter snake has evolved a high resistance to this toxin, allowing it to prey on the newt. This ongoing adaptation by both species in response to the other's evolution is an example of what type of coevolutionary relationship?

• Mutualism

• Commensalism

• Antagonistic coevolution

• Parasitism

Acacia trees provide shelter within their hollow thorns and nutrient-rich food bodies for Acacia ants. In return, the ants aggressively defend the tree from herbivores and remove competing vegetation. This interaction represents which type of symbiotic relationship?

• Parasitism

• Mutualism

• Competition

• Commensalism

Charles Darwin observed an orchid species with an exceptionally long nectar spur. Based on this unique floral structure, what did he hypothesize about its pollinator?

• It was self-pollinating and did not require an external pollinator.

• It relied on wind for pollen dispersal due to its unusual shape.

• It must be pollinated by an insect with an equally long feeding appendage.

• It attracted small birds that could reach the nectar with their beaks.

Leafcutter ants cultivate a specific fungus for food. To protect their fungal gardens from harmful pathogens, these ants host a particular type of bacteria on their bodies. What is the primary function of this bacteria in the ant-fungus symbiosis?

• It digests the leaves, making them edible for the fungus.

• It produces antibiotics that inhibit the growth of competing microbes.

• It serves as an additional food source for the ant larvae.

• It helps to aerate the fungal garden, promoting its growth.