Chapter 7 Lesson 1

Multiple Choice

In tropical rain forests, plants called ________ grow on other plants instead of in soil. They take advantage of the host plan's height to get more sunlight.

• canopies

• succulents

• deciduous trees

• epiphytes

Multiple Choice

Most trees in tropical dry forests are __________, which means they lose their leaves and stop photosynthesis during part of the year.

• deciduous

• succulent

• evergreen

• coniferous

Exploring Life's Diversity

• Genetic diversity: Differences in DNA among individuals of a population or species.

• Biodiversity: Variety of life across all levels of ecological organization.

• Species diversity: Number or variety of species in a given area.

• Ecosystem diversity: Variety of ecosystems, communities, or habitats in an area.

• Classification: Taxonomic groups used to classify species based on physical appearance and genetic makeup.

Species Diversity

Species diversity refers to the variety of different species in an ecosystem.
It is a crucial component of biodiversity, which encompasses all levels of ecological organization.
Species diversity helps maintain the balance and stability of ecosystems, ensuring their long-term survival.

Multiple Choice

Which term refers to the variety of life across all levels of ecological organization?

• Genetic diversity

• Biodiversity

• Species diversity

• Ecosystem diversity

Exploring Life's Diversity

Subspecies--are formed by the same processes that drive speciation. They differ from members of the same species in characteristics such as size or color.

Genetic diversity--provides the raw material for adaptation to local conditions.

Ecosystem diversity--refers to the number and variety of ecosystems within a given area.
Biodiversity distribution is difficult to measure, but species diversity is often used as an estimate. Insects, particularly beetles, dominate in terms of known and described species.

Insect Dominance

Insect dominance is the main factor that drives the formation of subspecies.
It is due to the diverse adaptations and behaviors of insects that lead to the development of distinct subspecies.
This phenomenon highlights the incredible impact insects have on shaping biodiversity.
Size and color differences and ecosystem diversity also play a role, but insect dominance is the primary driver.

Multiple Choice

What is the main factor that drives the formation of subspecies?

• Genetic diversity

• Ecosystem diversity

• Size and color differences

• Insect dominance

Exploring Life's Diversity

Scientists estimate that there are between 3 million to 100 million species on Earth, with the actual number likely falling between 5 million to 30 million.
The variation in estimates is due to unexplored areas, overlooked tiny organisms, and difficulties in identification.
Biodiversity patterns show an increase in species richness towards the equator and in structurally diverse habitats.
Intact ecosystems provide valuable ecosystem services, such as air and water purification, pest control, and waste decomposition, estimated to be worth at least $33 trillion annually.

Earth's Species

The estimated number of species on Earth ranges from 5 million to 30 million.
This vast diversity includes plants, animals, fungi, and microorganisms.
However, only a fraction of these species have been discovered and described by scientists.
The exploration of Earth's biodiversity is an ongoing and fascinating endeavor.

Multiple Choice

How many species are estimated to exist on Earth?

• 3 million to 100 million

• 5 million to 30 million

• 10 million to 50 million

• 50 million to 100 million

Impact of Species Extinction

The extinction of a single species can disrupt the functioning of an ecosystem.
It can lead to a loss of biodiversity, reducing the system's ability to resist and recover from environmental changes.
This can negatively impact agriculture, medicine, and ecotourism, as well as the overall health of the ecosystem.
Protecting and preserving biodiversity is crucial for maintaining ecosystem stability and the services it provides to society.

Impact of Extinction

The extinction of a single species can disrupt the functioning of the ecosystem.
It can lead to a loss of biodiversity and affect the balance of the food chain.
Ecosystems are complex and interconnected, so the loss of one species can have far-reaching consequences.
Protecting biodiversity is crucial for maintaining healthy ecosystems.

Multiple Choice

What is the impact of the extinction of a single species on an ecosystem?

• It has no impact on the ecosystem

• It can disrupt the functioning of the ecosystem

• It leads to an increase in biodiversity

• It improves the overall health of the ecosystem

Multiple Choice

Which of the following types of organisms perform photosynthesis?

• a primary producer

• an herbivore

• a carnivore

• a detritivore