HW #37 - AP Biology Period 4 #22 Liem Nguyen 2/20/10...

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AP Biology Period – 4 #22 Liem Nguyen 2/20/10 Homework #37 ( 090303 ): Chapter 37 (due Friday 090303 ) Total points: 40 for Attempt on all questions Concept Map: 10 Points Chapter 37: Plant Nutrition Objectives Nutritional Requirements of Plants 1. Describe the ecological role of plants in transforming inorganic molecules into organic compounds. Absorb ionic form from surrounding environment Autotrophic (use materials in photosynthesis) Create raw organic compounds from scratch Spread throughout rest of ecosystem Plants absorb inorganic molecules in their ionic forms from the surrounding environment, such as the soil, water, and air. Since they are autotrophic, they use these materials in photosynthesis to create raw organic compounds from scratch, which are then spread throughout the rest of the ecosystem in cycles and food chains. 2. Define the term essential nutrient. Required for plant Used for life cycles Produce another generation Essential nutrients are the chemical elements required for a plant to complete a life cycle  and produce another generation. 3. Explain how hydroponic culture is used to determine which minerals are essential nutrients. Known mineral composition Test specific combinations Observe resulting plant growth Scientists grow plants in mineral solutions without soil, of known composition missing certain nutrients, to compare it with a control containing all nutrients. They compare the growth of the plants, to see if the variable is deficient or not. 4. Distinguish between macronutrient and micronutrient.
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Both essential elements Macronutrients: needed in large amounts Micronutrients: needed in small amounts There are nine essential elements called macronutrients because plants require them in relatively large amounts. The remaining eight essential elements are known as micronutrients because plants need them in very small amounts. 5. Name the nine macronutrients required by plants. Forming structure of a plant: oxygen, hydrogen, nitrogen, and phosphorus, sulfur Used within the plant: potassium, calcium, and magnesium The first six elements are carbon, oxygen, hydrogen, nitrogen, phosphorus, and sulfur, the major components of organic compounds forming the structure of a plant. The other three macronutrients are potassium, calcium, and magnesium, which are for other uses within the plant itself. 6. List the eight micronutrients required by plants and explain why plants need only minute quantities of these elements. Chlorine, iron, manganese, boron, zinc, copper, nickel, molybdenum Used in small amounts Function in plants as cofactors, non-protein helpers Too much present, reaction catalyzed and disrupts balance These eight elements are chlorine, iron, manganese, boron, zinc, copper, nickel, and molybdenum, which are only needed in small amounts because they function in plants mainly as cofactors, non-protein helpers in enzymatic reactions. If there is too much of an
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HW #37 - AP Biology Period 4 #22 Liem Nguyen 2/20/10...

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