ecology quiz 21 - 1. (Points: 1) The ultimate source of...

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1. (Points: 1) The ultimate source of iron for all living things is a. phytoplankton. b. dust from the Sahara and other deserts. c. sap from plants. d. solid minerals in Earth's crust. e. light from the sun. Save Answer 2. (Points: 1) Which of the following influences the development and composition of soils? a. The parent material that was broken down through weathering b. The organisms associated with the soil c. The climate during development d. Both a and b e. All of the above Save Answer 3. (Points: 1) In order for most organisms to use the nitrogen in the atmosphere, dinitrogen gas must a. be taken in by green plants and transformed into nitrogen-rich protein. b. be inhaled by herbivores and transformed into ammonia, which can be dissolved in their blood. c. be taken up by certain bacteria that can change it into ammonium, a form that is available for plants. d. dissolve into an aqueous solution to form nitrate. e. chemically interact with argon in the soil, which allows it to be taken up by plants.
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This note was uploaded on 04/15/2010 for the course PCB 3044 taught by Professor Vonholle during the Fall '09 term at University of Central Florida.

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ecology quiz 21 - 1. (Points: 1) The ultimate source of...

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