1. District Science Grade 7 Unit 03 2017-2018

2. A sunlight B gravity C osmosis D water1
In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to —
A sunlight B gravity C osmosis D water
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3. I is negative to light, and III is positive to gravity.
2 The diagram illustrates a seed germinating. Many forces, including responses to moisture, light, temperature, and gravity are at work in this process.
Which of the following correctly describes two of the seedling's responses to stimuli?
I is negative to light, and III is positive to gravity.
IV is negative to temperature, and II is negative to gravity.
II is negative to light, and III is positive to gravity.
J II is positive to gravity, and IV is positive to moisture.
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4. 3 Which part of the plant above demonstrates the greatest amount of turgor pressure?
Part A
Part B
Part C
Part D
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5. 4 Which of the following graphics represents the hierarchy of living structure?J
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6. 5 Plant root tips have a layer of cells that function together to grow rapidly to allow the plant to increase the plant’s ability to reach water and stabilize in the ground.
Based on this information, what level of organization describes the plant root tips?
Tissue
Organ
Organ system
Organism

7. 6 What level of organization within a plant is the structure below?
Organ system
Tissue
J Organism
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8. 7 Trees that grow in a forest tend to grow very tall, with few branches. The same species of tree grown in an open area tends to grow shorter and wider, with many branches. The stimulus responsible for these different growth patterns is the amount of —
A wind striking the tree B light reaching the tree C nutrients in the soil
D water in the ground
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9. 8
Student 1
Student 2
Student 3
J Student 4
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10. to the leaves and allow carbon dioxide in so that that process
9 Some plants have small holes called stomata on the underside of leaves. Stomata are opened to draw water up
to the leaves and allow carbon dioxide in so that that process
of photosynthesis can occur. During the process, some water is lost
through the open stomata.
Based on this information, what external stimulus is most likely to cause the stomata to close?
Water volume increasing in the soil
Water volume decreasing in the soil
Carbon dioxide concentration increasing in the atmosphere
Carbon dioxide concentration decreasing in the atmosphere
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11. 10
The passion flower, also called maypop, is a long vine that grows along fences and woods, producing ornate white and purple flowers in late spring and summer. These plants have tendrils — slender, coiling, modified stem structures — that serve the plant by —
wrapping around a nearby object for support
producing reproductive structures later in the growing season
attracting insects which serve as pollinators
J encouraging water and mineral transport to other parts of the plant
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