1)Scientists can track the fate of chemical elements by using radioactively labl
ID: 236090 • Letter: 1
Question
1)Scientists can track the fate of chemical elements by using radioactively labled atoms and tracking their movements through biological systems. If a scientist labeled the oxygen (O) molecules in CO2 (carbon dioxide) and provided this radioactively labeled CO2 to a plant, you would expect the labled oxygen molecues to eventually wind up in which of the following molecules?
a) C6H12O6
B)O2
C) H2O
D) All of these are correct
2)Beans have 3 calories (kcals) per 1 gram of tissue, whereas potatoes have only 0.7 Calories per gram. Based on the numbers given, it appears Watney can harvest approx 1214 g of potatos per day for his consumption. If Watney grey beans instead of potatoes and could harvest 1214 g of beans per day, how many Calories per day would he be able to produce?
a)1735
B)3643
C)1500
D)850
3)Because he wants to maximize his crop output he thinks he might be able to use these lights to provide extra illumination to improve his potato crop yield. After looking at the specfications of the lights he sees that the light they emit is in the 500-550 nm wavelength of visible light. Will Watney be able to use these lights to boost the growth and productivity of his potato crop?
A) Yes, because plants dont require visible light to produce glucose.
B) No, because they are the wrong wavelength to stimulate photosynthesis
C)No, because no internal light source can ever duplicate the energy provided by the sun to plant crops.
D) Yes, because plants can use all wavelengths of visible light to produce glucose.
4) There is currently a trend for home gardeners to add their own urine (containing urea. CH4N20) to the soil of their vegetable gardens. Which of the following statements best explains why they would do this?
A) ALL of these are improtant reasons to add urine to their soil
B) Urine adds extra oxygen to the soil, to aid plants during resipiration
C) Urine adds extra carbon to the soil that the plants can use for carbon fixiation
D) Urine adds nitrogen to the soil in a form that plants can easily absorb.
5) Watney is enjoying a salad of mixed greens. which of the following is true regarding his meal?
A)Energy is released from the food Watney eats during cellular respiration
B) Plant leabes and stems contain glucose and other sugars that they produce as storage molecules
C) The calories in his food are ultimately derived from energy captured from the sun)
D)All of these are correct
6)Watney finds that his potato plants appear to be growing more slowly and producing smaller potatoes, relatively to his first crop. which of the following is the most likely explanation of why this might occur?
A) The Hab is not providing sufficient CO2 for the plants metabolism
b) All of the are equally likely reasons why Watneys plants may grow more slowly
C) The plants have depleted (used up) important nutrients in the soil
d)The Hab is producing the wrong wavelength of light to promote plant growth
Explanation / Answer
1) B
2) B
3) D
4) D
5) D
6) C
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