Raising ? requires the most land and water
beef cattle
which of the following requires the least land to produce 1 kg of protein
chicken
monoculture
is an agricultural practice of growing large strands of a single species
GM crops require
artificial pollination methods
Bt crops
have been given a bacterial gene that gives chemical protection against pests
green revolution techniques
have increased crop yields but may not be sustainable
Relative to agriculture, insects are usually
essential pollinators and predators for sustainable systems
seed bands are important for
protecting genetic diversity
it is more energetically efficient for us to eat more
plant based foods
The loss of species from the planet
Extinction
Differences in DNA composition among individuals within a given species
genetic diversity
protected animals, such as tigers, that need large amounts of land
umbrella species
an area that supports an especially great diversity of endemic species
hotspot
which scientists classify species using an organisms physical appearance and genetic makeup
Taxonomists
The greatest diversity (number of different species) of organisms can be found in
insects
A species of lizard has gone extinct. This could be due to any of the following reasons except
increased genetic diversity within the species
in general successfully introduced species experience
competitive success against native species
Bullfrog tadpoles are often sold as fish bait, even in areas where they do not occur naturally. When people buy 10 of them and dont use them all, they often dump the remainder into the lake or river. this is an example of
introduced species
biodiversity enhances human food security because it
is a potential source os new food items or new genetic varieties of existing foods
Removal of which of the following species will always result in the greatest changes in an ecological system?
a keystone species
The species most often vulnerable to human impact is the
decomposer
ecotourism
increases biodiversity by providing income to areas that might otherwise be destroyed
The first national park was
yellowstone
___% of earth's land area is currently covered by forest?
30
Deforestation
Has the greatest impact in tropical areas and arid regions
Why do developing nations impose few or no restrictions on logging?
They are desperate for economic development
Clear-cutting
removes all trees from an area
controlled burns would be used in forests
That are subjects to severe wild fires to remove fuel load and stimulate new growth
Edge effects are a particular problem when
formerly large habitats are reduced to small fragments
Paper parks are
areas protected on paper but not in reality due to lack of funding
The area effect of the equilibrium theory of island biogeography suggests that
the number of species increases with the size of the island; all else being equal, larger island contain more species
edge effects are a particular problem when
formerly large habitats are reduced to small fragments