Crash Course BIology: Ecology (Spanish)

Why are elephants considered a keystone species in Botswana?

• They are the largest animals in the region.

• Their dung provides food for dung beetles.

• Their footprints create water sources for giraffes and their actions help smaller plants grow for other herbivores.

• All of the above.

What is the primary focus of ecology?

• Studying how to protect and restore natural environments.

• Analyzing the chemical composition of the Earth's atmosphere.

• Investigating how living organisms interact with each other and their environment.

• Classifying all the different species on Earth.

Which of the following is an example of an abiotic factor in an ecosystem?

• A dog and its fleas.

• The climate of a region.

• A group of zebras grazing.

• Different types of plants on a mountain.

What defines an ecosystem?

• A large geographical area with similar climate and vegetation.

• All the living organisms in a specific area.

• All organisms and non-living elements interacting in a specific area.

• The study of how a single species' population changes over time.

Which of the following organisms can be classified as a producer in an ecosystem?

• A fox that eats beavers

• A beaver that eats plants

• A fungus that decomposes dead organic matter

• An alga that performs photosynthesis

What percentage of energy is typically transferred from one trophic level to the next in an ecological pyramid?

• 1%

• 10%

• 50%

• 90%

What was identified as the primary cause of the mass elephant deaths in Botswana?

• A severe drought leading to starvation

• Predation by apex predators like lions

• Poisoning from neurotoxins produced by cyanobacteria

• A new viral infection spreading rapidly among the herds

Which of the following is an example of an ecosystem service that benefits humans?

• The process of photosynthesis by plants

• The decomposition of organic matter by detritivores

• The production of food through agriculture

• The flow of energy through trophic levels