Gas Exchange in Plants Quiz
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Questions and Answers

What color does the hydrogencarbonate indicator turn when there is a higher than normal level of carbon dioxide?

  • Red
  • Green
  • Purple
  • Yellow (correct)

What is the primary role of green plants in relation to carbon dioxide and oxygen during photosynthesis?

  • They absorb carbon dioxide and produce oxygen. (correct)
  • They absorb excess oxygen and release carbon dioxide.
  • They produce carbon dioxide and absorb oxygen.
  • They do not interact with oxygen or carbon dioxide.

What happens to the color of the hydrogencarbonate indicator in tube A after five hours in bright light?

  • Turns purple (correct)
  • Turns yellow
  • Stays red
  • Turns green

Why are tubes B and D set up in the experiment?

<p>To ensure accurate results without leaves. (D)</p> Signup and view all the answers

What does tube C indicate about gas exchange when placed in the dark?

<p>Plants release more carbon dioxide. (A)</p> Signup and view all the answers

What color indicates a normal level of carbon dioxide in the hydrogencarbonate indicator?

<p>Red (D)</p> Signup and view all the answers

How does respiration in plants relate to their gas exchange process?

<p>Plants take in oxygen and release carbon dioxide during respiration. (B)</p> Signup and view all the answers

What effect does covering tubes C and D with aluminum foil have on the results?

<p>It prevents light from entering. (A)</p> Signup and view all the answers

What occurs in plants under light conditions?

<p>Photosynthesis outpaces respiration. (D)</p> Signup and view all the answers

During dark conditions, what is the gas exchange occurring in plants?

<p>Respiration leads to a net release of carbon dioxide. (A)</p> Signup and view all the answers

Which function do stomata serve in plants?

<p>They facilitate gas exchange. (B)</p> Signup and view all the answers

What is one characteristic of a biological drawing of a stoma?

<p>It should be drawn in proportion. (C)</p> Signup and view all the answers

Which statement describes the net uptake of oxygen during light conditions?

<p>It is higher than the net uptake of carbon dioxide. (C)</p> Signup and view all the answers

What equipment is necessary for observing stomata on a leaf?

<p>A light microscope and a prepared slide. (A)</p> Signup and view all the answers

How do plants respond to the challenges of gas exchange in different light conditions?

<p>They allow gas exchange through stomata. (B)</p> Signup and view all the answers

What is the main outcome of photosynthesis in terms of gas exchange?

<p>Uptake of carbon dioxide and release of oxygen. (C)</p> Signup and view all the answers

Flashcards

Photosynthesis

Process where plants use carbon dioxide and light to make food and release oxygen.

Respiration in plants

Process where plants use oxygen to release energy from food and produce carbon dioxide.

Hydrogencarbonate Indicator

Solution used to show the presence of carbon dioxide in a solution by changing color.

CO2 uptake in plants

Plants absorb CO2 during photosynthesis.

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CO2 release in plants

Plants release CO2 during respiration.

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Net Gas Exchange

Overall gain or loss of gases (CO2 and O2) in a plant, considering both photosynthesis and respiration.

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Stomata

Tiny pores found on the surface of leaves that allow gas exchange.

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Photosynthesis rate

Speed of plants creating energy using sunlight, water, and CO2 (in plants).

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Respiration rate

Speed at which plants use energy and release CO2.

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Light conditions (gas exchange)

In light, photosynthesis is more dominant than respiration leading to CO2 uptake and O2 release.

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Dark conditions (gas exchange)

In dark conditions only respiration occurs, leading to CO2 release and O2 uptake from the air.

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Leaf epidermis

Outer layer of a leaf, where stomata are located.

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Microscope

Tool used to see small things.

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Gas Exchange in Plants

Process where plants absorb and release gases such as oxygen and carbon dioxide through stomata.

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Hydrogencarbonate indicator color

Color change of hydrogencarbonate indicator solution indicating level of CO2 (purple, red, yellow).

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Study Notes

Gas Exchange in Plants

  • Green plants carry out both photosynthesis and respiration.
  • Photosynthesis uses carbon dioxide and produces oxygen.
  • Respiration uses oxygen and produces carbon dioxide.

Practical: Studying Carbon Dioxide Uptake/Release

  • Hydrogencarbonate indicator:

    • Purple: Lower than normal CO2 levels
    • Red: Normal CO2 levels (about 0.04%)
    • Yellow: Higher than normal CO2 levels

  • Procedure:

    • Four boiling tubes (A, B, C, D) containing hydrogencarbonate indicator and leaves (A & C).
    • Tubes C & D wrapped in aluminum foil (dark).
    • Tubes A & B in bright light for 5 hours.

  • Results:

    • Tube A (light, with leaves): Indicator turned purple (CO2 uptake).
    • Tube B (light, no leaves): Indicator remained red (no change in CO2 levels).
    • Tube C (dark, with leaves): Indicator turned yellow (CO2 release).
    • Tube D (dark, no leaves): Indicator remained red (no change in CO2 levels).

  • Conclusion:

    • Leaves take in CO2 in the light (photosynthesis).
    • Leaves release CO2 in the dark (respiration).

Net Gas Exchange in Plants

  • Depends on the relative rates of photosynthesis and respiration.
  • Light conditions:
    • Photosynthesis rate > Respiration rate.
    • Net uptake of CO2.
    • Net release of O2.
  • Dark conditions:
    • Only respiration occurs.
    • Net release of CO2.
    • Net uptake of O2.

Gas Exchange through Stomata

  • Stomata are pores on leaves.
  • Allow gases (CO2, O2) to move in/out of leaves.

Practical: Observing Stomata

  • Observe prepared slide of leaf epidermis under a microscope:
    • Low magnification (e.g. 100X).
    • High magnification (e.g. 400X).
    • Draw a labeled diagram showing a stoma and surrounding cells.

Key Points

  • Gas exchange in plants is mainly carried out through the stomata.

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Related Documents

Charlene Sci 7.4 Gas Exchange in Plants PDF

Description

Test your knowledge on gas exchange processes in plants, including photosynthesis and respiration. Explore how these processes affect carbon dioxide levels using practical experiments involving hydrogencarbonate indicators.

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