Honors and AP Biology Homework Chapter 32: Sources of Nutrients
Textbook Assignment: Chapter 32: Plant Nutrition and Transport, sections 12-15.
- 32.12 Plants depend on nitrogen. While the atmosphere is 79% N2, the atoms are triple bonded and the energy required to break the bond is too large for plant enzymes to overcome. Bacteria, however, possess the ability to break N2 and fix it with hydrogen in forms of ammonia NH3 and NH4+ ions.
- 32.13 Mycchorizae are the structures formed by roots and fungi to break down organic materials and absorb them. The plant gets simplified nutrients and the fungi get starches.
- 32.13 Some plants get their nutrient by "eating" insects; others are parasites on other plants.
- 32.14 Plant demonstrate a considerable variety of forms, and can show up as epiphytes, parasites, and even carnivers.
Read the following weblecture before chat: Nutrition in Plants.
Take notes on any questions you have, and be prepared to discuss the lecture in chat.
Perform the study activity below:
Use the plant nutrient removal calculator at Crop Nutrition to determine how quickly different crops and yields pull nutrients from the soil. Record the amounts of each nutrient required for the four crops you survey at 1/3 of maximum yield (the default setting).
- which crop requires the most nitriogen?
- which crop requires the most phosphate?
- which crop requires the most potassium oxide?
- which crop requires the most sulfur?
Adjust the yield to 50% (half, with the dot at the top of the circle). Can you still grow all four crops?
Adujst the yield to maximum. Can you still grow all four crops?
Check each of the nutrients in the table at the top of the page and explore the information on nutrient use based on plant location? Why are nitrogen, phosphate, potassium oxide, and sulfur important?
What is the difference between macronutrients, secondary nutrients, and micronutrients?
Chat Preparation Activities
- Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
- Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.
- Required: Complete the Mastery Exercise with a score of 85% or better.
- Optional: Test yourself with the textbook multiple choice questions and note any that you miss that still don't make sense. Bring questions to chat!
- Go to the Moodle and take the quiz for this chapter.
Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.
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