Pre-AP Biology Practice Unit 3 Test

How does the stomata work?

• It helps transport sugars to the root cells.
• It helps to transport nutrients to the roots.
• It helps to exchange gases and water.
• It helps to conduct fermentation in the leaf.

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This organelle is found in plants and helps them to capture sunlight.

• Chlorophyll
• Chloroplast
• Vacuole
• Mitochondria

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Mike has four aquatic plants of the same size and the same species. He submerges the plants in a separate beaker filled with 200 ml of water. She then sets each beaker under a different intensity of light. Mike observes that, of the four plants, the plant in the beaker under the most intense light gives off the most gas bubbles in a 20 minute period.
Which of the following statements best explains Mike’s observations?

• Cells decompose most quickly under the most intense light.
• Water evaporates from plants faster under the most intense light.
• Photosynthesis occurs at the highest rate under the most intense light.
• Gases in the leaves of plants expand most under the most intense light

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Why are there less air bubbles as the plant is place further away from the light source

• because cellular respiration decreases when there is less light
• because the light independent reaction decreases when there is less light
• because photosynthesis decreases as a plant is moved further away from a light source
• the wavelength increases as a plant is placed further away from a light source

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What is the correct equation for cellular respiration?

• 6O₂ + C₆H₁₂O₆ -> 6CO₂ + 6H₂O + Energy
• 6O₂ + C₆H₁₂O₆ + Energy -> 6CO₂ + 6H₂O
• 6CO₂ + 6H₂O -> 6O₂ + C₆H₁₂O₆ + Energy
• 6CO₂ + 6H₂O + Energy -> 6O₂ + C₆H₁₂O₆

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Chlorophyll is green because 

• it absorbs green wavelengths of light
• it absorbs blue and yellow wavelengths which make green
• it transmits light and causes an optical illusion
• it reflects green wavelengths of light

All organic molecules contain carbon that ultimately can be traced back in the food chain to:

• the bodies of heterotrophs
• carbon dioxibe from the atmosphere
• water absorbed by plants
• the carbon that comes from the sun

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Graph 1 demonstrates that the rate of photosynthesis

• decreases in response to increasing light intensity
• increases indefinitely in response to increasing light intensity
• increases in response to increasing light intensity, but only to a certain point
• is unaffected by changes in light intensity

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What happens to light energy when it is used by plants in photosynthesis?

• its turned into glucose
• its turned into Carbon dioxcide
• its turned into air

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What is the equation for photosynthesis?

• 6CO₂ + 6H₂0 ----> C₆H₁₂O₆ + 6O₂
• 6CO_2 -----> C₆H₁₂O₆

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