Explain the role of pollinators in agriculture, and describe two reasons for the global declines in pollinator populations
What will be an ideal response?
For many crops, such as apples, peppers, tomatoes, and melons, pollinators are needed to transfer pollen grains from one plant to another. Without this crucial step, these crops would not be able to develop fruit. Plants are pollinated by a wide variety of insects, such as bees and butterflies, and sometimes by birds and bats. Pollinators are threatened by habitat loss as their native ecosystems have been replaced with monoculture fields. Their populations have also declined because of the widespread use of insecticides on agricultural fields. The use of insecticides on crops requiring pollinators can in fact decrease crop yield.
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The historical figure known for liberating much of Spanish-speaking South America is
A) Napoleon Bonaparte B) Simon Bolìvar C) King Juan Carlos of Spain D) Pope Francis E) Christopher Columbus
Evidence for the Big Bang is
A) the long wavelength radiation that permeates the universe. B) the slowing down of galaxies as they recede. C) both of these D) neither of these
Why has South Asia experienced so many insurgencies since the end of British rule in 1947?
What will be an ideal response?
What is atmospheric circulation on Earth?
A) released by the heat from Earth's interior B) follow tidal effects of the Sun and the Moon C) transport heat and moisture over Earth's surface D) produced by Earth's rotational tilt E) differences in elevation over Earth's surface