Homework 10

Exam 5

Pollination is an example of ________?
a) a possible source of new drugs
b) chemical diversity
c) an ecosystem service
d) crop pest control

c) an ecosystem service

Which of the following statements is not supported by this graph?
a) There are more vulnerable fishes than critically endangered and endangered fishes combined.
b) There are more critically endangered amphibians than vulnerable, endangered and critically endangered reptiles combined.
c) Within each group, there are more critically endangered species than vulnerable species.
d) A greater percentage of bird species are critically endangered than mollusk species.

c) Within each group, there are more critically endangered species than vulnerable species

T or F: The Greenhouse Effect is human made

False

T or F: Most species on earth have been observed, named and catalogued.

False

Converting a prairie to a farm field is an example of ________?
a) overharvesting
b) habitat loss
c) exotic species
d) climate change

b) habitat loss

What is an ecosystem service that performs the same function as a pesticide?
a) pollination
b) fertilization
c) crop diversity
d) predators of pests

d) predators of pests

Consider the food chain: phytoplankton → clams → crabs → sea stars. How many kilograms of sea stars can 10,000 kg of phytoplankton support?
a) 1000
b) 100
c) 10
d) 1

c) 10

The number of currently described species on the planet is about ________?
a) 15,000
b) 150,000
c) 1.5 million
d) 15 million

c) 1.5 million

T or F: Once a species is categorized as "endangered," it cannot recover.

False

Habitat destruction, overexploitation, invasive species, pollution, and climate change are all threats to biodiversity.
T or F: most species experience more than one of these threats.

True