. Laboratory problems in civic biology. Biology. PROBLEM 111 129 How does it get to the plant? Does the plant use oxygen as the animal does? Conclusion. — 1. How are plants able to store up energy? Where does it come from? What becomes of it? 2. Explain the carbon cycle. 3. Explain the oxygen cycle. ,-^49 etc. Problem 110: To find out the course of nitrogen in its rela- tion to plants and animals. Method. — Begin at the point of the diagram marked " Free N," following the direction of the arrows. Observations. — What do we mean by " free nitrogen " ? Where is it found? How
. Laboratory problems in civic biology. Biology. PROBLEM 111 129 How does it get to the plant? Does the plant use oxygen as the animal does? Conclusion. — 1. How are plants able to store up energy? Where does it come from? What becomes of it? 2. Explain the carbon cycle. 3. Explain the oxygen cycle. ,-^49 etc. Problem 110: To find out the course of nitrogen in its rela- tion to plants and animals. Method. — Begin at the point of the diagram marked " Free N," following the direction of the arrows. Observations. — What do we mean by " free nitrogen " ? Where is it found? How do green plants get the free nitro- gen? In what form does the nitrogen get into the animal body? In what form does the nitrogen leave the bodies of ani- mals? What causes this material and the dead bodies of animals to become usable by plants? Does any nitrogen get back into the atmosphere again? If so, how and when? Look this up in any good book of reference. Conclusion. — 1. Fill out a summarizing table Hke the accom- panying. 2. In your notebook explain in a well-writ- ten paragraph what is meant by the nitrogen cycle. y^PIantLife Nitrous Bacteria/^,,^gt6t^ VKT- Nitrites ^V'ates- «0i0 'Nitric Bacteria T> Ind of Outgo of Aninvcilg to Graeiv. bacteria Problem 111: To prove a hay infusion is an unbalanced aquarium. Materials. — Hay, glass jar, microscope, glass slides, cover glasses, and pipette. HUNTER LAB. PROB. 9. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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