Pset7questions2013

Question 5 of 6 40 points the uptake of ions in plant

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Question 5 of 6 4.0 Points The uptake of ions in plant cells is influenced by the A. electrical gradient. B. concentration gradient. C. ionic balance. D. pumping of H +. E. All of the above Reset Selection Mark for Review What's This? Question 6 of 6 4.0 Points Which of the following is true about the movement of solutions in the apoplast (the transport route through intercellular spaces)? A. Osmosis of water across a semipermeable membrane is involved. B. Movement of materials is regulated by membranes. C. Water and solutes move by bulk flow. D. Only plasmodesmata are involved E. Water and solutes enter the stele via this channel. Reset Selection Mark for Review What's This? Part 4 of 4 - Nutrition Question 1 of 7 4.0 Points Tanya gives up trying to grow plants in soil and instead begins hydroponic farming, where plants are suspended in a soil-less mineral nutrient solution made by simply by supplying KH 2 PO 4 , Ca(NO3) 2 and MgSO 4 , dissolved in tap water. Her plants grow very successfully, despite the fact that she has only supplied a few nutrients. Why? A. macronutrients are the only nutrients required B. the plants can fix all other nutrients needed C. tap-water contains enough micronutrients to supply the plants' needs D. tap-water is rich in nutrients E. all the above are correct
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5/20/13 4:18 PM 2013 Problem Set 7 Plant Biology Lectures 3-7 Page 11 of 13 https://coursework.stanford.edu/portal/tool/1c2f43e9-1653-4e97-98f7-93a4fbb2cb09/jsf/delivery/beginTakingAssessment Reset Selection Mark for Review What's This? Question 2 of 7 4.0 Points Tanya grows her own vegetables: her lettuce are puny, so she decides to add fertilizer to the soil. The package says add a teaspoon per 10 square feet: she decides she wants really BIG lettuce, so she adds a cup of fertilizer per square foot. To her surprise (and horror) the lettuce wilt, turn brown and die. What is the initial reason the plant wilts? A. fertilizer caused leaf cells to grow too fast and weaken 2 C. fertilizer caused guard cell opening, resulting in too much water loss D. excess fertilizer in the soil reduced the flow of water from the soil to the roots and may even have caused water to leave the roots and enter the soil. E. all the above Reset Selection Mark for Review What's This? Question 3 of 7 4.0 Points Nathan, on the other hand, is an organic farmer: he does not use artificial fertilisers, and instead carefully assays the soil: the pH is 7.8, but it is low in nutrients, so he supplies his vegetables abundant bone meal ( for HPO4 2- ) and manure (for K + , Mg 2+ and NO3 - ). Despite this apparently healthy diet, his plants show signs of both nitrogen and phosphorous deficiency. Which of the following is the most likely explanation for this?
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Question 5 of 6 40 Points The uptake of ions in plant cells...

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