Quiz 4: Human impact on the Environment

What is biodiversity?

• The variety of life in a particular habitat or ecosystem.

• A single species in an ecosystem.

• A type of biological classification.

• The study of extinct animals.

Why is biodiversity valuable?

• It contributes to ecosystem productivity and balance.

• It increases pollution.

• It decreases agricultural yields.

• It reduces the number of species.

Which of the following is a current threat to biodiversity?

• Conservation efforts.

• Habitat destruction.

• Species introduction.

• Pollution control.

What does biodiversity refer to in the context of the biosphere?

• The pollution levels across various ecosystems

• The total of all the genetically based variation in all the organisms

• The number of endangered species in a region

• The climate variations observed in different habitats

What role do healthy and diverse ecosystems play in environmental quality?

• They increase air and water pollution

• They have no significant impact on the environment

• They play a role in maintaining soil, water, and air quality

• They primarily contribute to economic development

How many species have been identified and named?

• 1.8 million species

• 30 million species

• 2 million species

• 25 million species

What is estimated about the number of species yet to be discovered?

• Up to 30 million more to be discovered

• Up to 20 million more to be discovered

• Up to 10 million more to be discovered

• Up to 40 million more to be discovered

What does genetic diversity encompass?

• The variety of ecosystems in a region

• The number of species in a community

• The total of all different forms of genetic information carried by a particular species, or all organisms on Earth

• The ecological roles of different species within an ecosystem

What is a benefit of genetic engineering using genes from wild plants?

• Faster plant growth

• Higher yield per acre

• Transfer of pest resistance traits to crops

• Reduction in fertilizer use

What percentage of species that have ever lived are estimated to be extinct according to scientists?

• A) 75%

• B) 85%

• C) 99%

• D) 50%