How do agricultural practices affect the nitrogen cycle?
What will be an ideal response?
ANSWER: Agriculture depletes soil nitrogen by removing plants from the field. Therefore, the plant
parts are not available for ammonification. Traditional agricultural practices minimized soil
erosion and maximized nutrient retention. For example, farmers rotated their crops,
cultivating nitrogen-fixing legumes. Modern industrial agriculture adds nitrogen to the soil in
the form of synthetic fertilizer. Fertilizer application is related to increased nitrogen in
aquatic systems, which affects nitrogen cycling in fresh and marine systems.
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Which of the following is the correct sequence
in terms of increasing size? a. ecosystem >>> community >>>biome >>> biosphere b. ecosystem >>> biome >>> biosphere >>>community c. biome >>> ecosystem >>> community>>> biosphere d. community>>>ecosystem >>> biome >>> biosphere e. community>>>biome >>> ecosystem >>> biosphere
The condition that exists when an organism gains or loses one or more chromosomes but not a complete haploid set is known as ________
A) triploidy B) trisomy C) polyploidy D) aneuploidy E) euploidy
A number of different genes have been identified as affecting skin color and there are probably more as yet unidentified. Each of these genes likely has several regulatory protein factors affecting their expression, and those proteins are coded for by
yet more genes. Thus there are many genes, some of which have multiple alleles, involved in determining skin color. What property of skin color does this multigene foundation not explain? A) Some people tan easily and some get sunburned rather than becoming tan. B) Some people have very dark skin, some have very light skin, and there is nearly continuous variation in between. C) There is variation in the amount of vitamin D humans need. D) Skin color can be acted on by natural selection.
Meiosis I produces ________, and meiosis II produces ________ cells.
A. two haploid, 4 haploid B. two somatic, two gametic C. two haploid, two haploid D. two diploid, 4 haploid E. two diploid, two haploid