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1 | |
What are the specialized cells that move water from the roots to the leaves of a plant? |
| | A) | phloem tissue cells |
| | B) | xylem tissue cells |
| | C) | water pump cells |
| | D) | water tubules |
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2 | |
The transport of water up the plant is aided by root pressure. How is this pressure created? |
| | A) | The weight of the surrounding dirt on the roots of the plant. |
| | B) | Root pressure is created when water flows into the root system, trying to dilute the solutes inside. |
| | C) | Tiny pump cells within the roots create this pressure. |
| | D) | The cambium of the root creates this pressure. |
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3 | |
Many plants have adaptations to help them survive in certain climates. The cactus is one such plant. Its leaves have been modified into spines in an effort to: |
| | A) | increase the amount of surface area for photosynthesis. |
| | B) | reduce the amount of shade produced by the plant. |
| | C) | reduce the amount of water lost by transpiration. |
| | D) | increase the surface area for dew to collect. |
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4 | |
One major difference between xylem cells and phloem cells is: |
| | A) | Xylem cells are very square in shape while phloem cells are not. |
| | B) | Phloem cells are covered in tiny hair-like projections to increase absorption while xylem cells are not. |
| | C) | Phloem cells are dead while xylem cells are alive. |
| | D) | Xylem cells are dead while phloem cells are alive. |
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5 | |
Water has two special properties that make it possible for plants to transport water up great distances within their vascular tissues. One property is __________________, which is a tendency of water molecules to stick to each other, and the other is __________________, which is a tendency for water molecules to stick to other surfaces. |
| | A) | cohesion, adhesion |
| | B) | cohesion, attraction |
| | C) | adhesion, cohesion |
| | D) | adhesion, attraction |
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6 | |
A number of processes and forces are necessary for moving water and nutrients from the soil around the plant to the leaves. In order, these processes are: |
| | A) | adhesion/cohesion, osmosis/diffusion, transpiration |
| | B) | adhesion/cohesion, transpiration, osmosis/diffusion |
| | C) | osmosis/diffusion, adhesion/cohesion, transpiration |
| | D) | osmosis/diffusion, transpiration, adhesion/cohesion |
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7 | |
Why do trees that have their outer bark and xylem damaged quite often die? |
| | A) | They are no longer able to move food from the leaves to the roots of the plant, and once the roots die, the plant dies. |
| | B) | They are no longer able to move water from the roots to the leaves, and once the leaves die, the plant dies. |
| | C) | The damaged area allows disease to get into the tree and kill it. |
| | D) | The tree dries out as a result of the damaged area. |
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8 | |
Plants are able to respond to stimuli from around them. What are these responses called? |
| | A) | reactions |
| | B) | tropisms |
| | C) | controls |
| | D) | auxins |
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9 | |
In 1880, Charles Darwin and his son devised an experiment in which they used oat seedlings. They set up four treatment groups of developing seedlings. In the first group, they removed the tip, in the second, they covered the tip with foil, in the third, they covered the base of each seedling with foil, and they left the fourth group untouched. What were they trying to test? |
| | A) | phototropism |
| | B) | gravitropism |
| | C) | foilotropism |
| | D) | nastic response |
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10 | |
There are many reasons that a plant might need to be able to sense where "up" is. Which of the following is NOT one of the potential reasons? |
| | A) | to make the developing seed grow in the correct direction |
| | B) | to make the plant out compete neighbouring plants for sunlight |
| | C) | to ensure that the plant transports water in the correct direction |
| | D) | to make the roots grow in the correct direction |
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11 | |
In the early 1900s, a Dutch researcher named Frits Went confirmed that there was a chemical produced in the stem tips of growing seedlings that stimulated growth. He named this chemical: |
| | A) | SGH (seedling growth hormone) |
| | B) | GH (growth hormone) |
| | C) | agar |
| | D) | auxin |
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