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Key Concepts Quiz

This activity contains 12 questions.

Question 1
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I was given a beautiful cactus plant a couple of months ago, and it recently died. I was told that it was overwatered. I know plants need water to survive and they take what they need from the soil, so how would adding too much water to the soil kill the cactus?
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Question 2
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How do root hairs aid in water uptake in roots?
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Question 3
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I tend to have an inquiring mind, and I want to know more about how water moves within the plant body. I take a common houseplant and cut the stem off about 1 inch from the soil surface. I notice water collecting at the cut as if some force is pushing it up through the roots and remaining stem. How could I best explain my findings?
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Question 4
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Guard cells actively open and close the stomata of leaves. What delicate internal balance do these guard cells control with their actions?
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Question 5
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When considering the source-to-sink model of phloem transport, what structures can act as either a source or a sink?
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Question 6
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I have decided I want to grow tomatoes year-round using hydroponics methods. I have set up the appropriate mineral concentrations, solution circulation equipment, and aeration to maintain cellular respiration in the root system. Everything looks great for a couple of months, then the plants start to turn yellow, especially the tips of older leaves, and then die. What do you think is the likely cause of this problem?
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Question 7
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I have decided to move to the tropics and start a banana plantation. After paying the loggers to clear-cut the land for my plantation, I plant my new crop of banana trees. The plants get off to a decent start, but soon growth halts and the plants wither and die. The tropics support some of the greatest plant diversity on the planet, so why are my banana trees dying?
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Question 8
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As I walk through the local grocery store, I notice some beautiful tomatoes with a big "organically grown" sticker. I am quick to pay more for these tomatoes because they must be better for me. Is this a valid assumption?
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Question 9
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In this modern age of science, which of the following shows the most promise in producing crops with a higher yield?
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Question 10
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I had the privilege of visiting Mt. St. Helens in the late 1990s. One of the things I noticed was that very few plants were growing in the blast zone due to the scarcity of certain essential elements. In fact, the few plants growing in the area were members of the plant group called legumes. What allows legumes to grow in this area?
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Question 11
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I own property with a barren hill that I decided to plant in pine trees. I notice that the trees are not doing very well; in fact, many are starting to die. I know that there are ample nutrients and water in the area. What is the likely culprit of the deaths in my tree plantation?
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Question 12
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What conditions would produce plants that are parasitic or carnivorous?
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