Unit 3 Multiple Choice Test

Four students observed a wilted plant and were asked to identify the internal stimulus that caused the wilting. Their responses are shown below.

Students observed a plant left by a window over several days. The plant was watered daily. After three days, the plant began to grow towards the window . Which of the following best explains the student’s observations?

What purpose does the xylem in a plant serve?

In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to —

On leaf surfaces, guard cells that open and close in response to the amount of water available is an example of—

What process causes a plant to wilt in response to too much or too little water?

Students conducted a lab. They used identical plants and containers. Both plants had equal exposure to sunlight. Plant A received 100 mL of fresh water, while plant B received 100 mL of salt water. Which did the students observe?

Responses in plants that result in movement away from or toward a stimulus are called —

geo mean

photo mean

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