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All of the following contributed to the dust bowl in the american southwest during the 1930s
overgrazing by cattle
plowing of native grasses
planting of field crops
lack of soil moisture
a farming commitment that embraces a variety of methods that are conservation minded, enviromentally safe, and profitable
what would be the most efficent strategy to remove toxic heavy metals from a soil?
adding plant species that have the ability to take up and volatize heavy metals
sequence during the alternation of generations life cycle in a flowering plant
sporophyte --> meiosis--> gametophyte --> gametes --> fertilization --> diploid zygote
recent research has shown that pollination requires that _____ recognize pollen grains as "self or non self"
________ undergoes ______, produces a _____ gametophyte consisting of the ______ cell and ____ cell. These cells, along with the ____ wall constitute a ____ grain
Microspore; mitosis; male; generative; tube; spore; pollen
One sperm, upon reaching the female gametophyte, fertilizes the egg, formin the zygote
General mechanisms, such as inhibiting the germination of pollen on stigmas, or the elongation of the pollen tubes in the styles, that prevent self pollination
Angiosperm double fertilization
so-called because if features the formation of one embryo involving one sperm cell and an endosperm involving a second sperm cell
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