Biology 20 Review Questions And Answers
Ecosystem A group of populations with abiotic factors
Food chain A step-by-step sequence linking organisms that feed on each other
Producer An autotroph that makes its own foot
Consumer A heterotroph that eats producers and other consumers
Indicator spec...
Ecosystem A group of populations with abiotic factors
Food chain A step-by-step sequence linking organisms that feed on each other
Producer An autotroph that makes its own foot
Consumer A heterotroph that eats producers and other consumers
Indicator species A species sensitive to small changes in environmental conditions
Herbivore An animal that eats only plants
Carnivore Only eats meat
Omnivore Eats both plants and animals
, Biology 20 Review Questions And Answers
Explain the circumstance in Bangladesh where frogs were over-hunted Frog populations
fell, insect populations soared, among them mosquitoes, increasing the cases of malaria
Detritus The waste from plants and animals including their dead remains
Decomposer An organism that breaks down detritus
Why are indicator species important? Because they alert observers of changes (oftentimes
negative) in the ecosystem
Habitat The place/environment with conditions suitable for the survival of an individual,
or population of an organism
What is the main cause for he decline in population of frogs? Habitat loss
What are the four major causes of frog population decline? Habitat loss, Air and water
quality, climate change, and UV radiation
, Biology 20 Review Questions And Answers
How does air and water quality affect the frog population? Frogs breathe through their
skin, so pollution gets into their system. Acidic conditions lessen the chances of an egg being
fertilized because it decreases the movement of sperm, and cause mutations in the tadpoles
How does climate change affect the frog population? Frogs can't separate themselves from
water for too long, so if ponds start to dry out, the population declines
How does UV radiation affect frog population? The thinning of the O3(g) layer causes
more UV radiation to pass through. This harms the sensitive skin of the frog (which also live at
higher altitudes) and damages their cells. Especially those with black eggs.
Explain the Gaia Hypothesis Emphasizes that all living things interact with each other and
the non-living components of our planet
Is a virus biotic or abiotic? Abiotic
True or False:
All components of the biosphere interact with both biotic and abiotic factors True
, Biology 20 Review Questions And Answers
Extirpation When an animal is extinct from a certain area
Endangered A species close to extinction
Explain the decline in eagle population Their eggshells were becoming thinner due to
chemicals being introduced into their food chain
Threatened species A species that is likely to become endangered
Special concern species A species at risk because of low or declining numbers
Top level consumer They have no predator but act as a predator to all
Examples of endangered, extirpated, threatened, and special concern species Whooping
crane in Alberta, Grizzly Bears in Mexico, Fowler's Toad and Leopard frogs in Ontario,
Wolverines in Nunavut
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