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?

To ensure accurate results without leaves. Signup and view all the answers

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

Plants release more carbon dioxide. Signup and view all the answers

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

Red Signup and view all the answers

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

Plants take in oxygen and release carbon dioxide during respiration. Signup and view all the answers

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

It prevents light from entering. Signup and view all the answers

What occurs in plants under light conditions?

Photosynthesis outpaces respiration. Signup and view all the answers

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

Respiration leads to a net release of carbon dioxide. Signup and view all the answers

Which function do stomata serve in plants?

They facilitate gas exchange. Signup and view all the answers

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

It should be drawn in proportion. Signup and view all the answers

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

It is higher than the net uptake of carbon dioxide. Signup and view all the answers

What equipment is necessary for observing stomata on a leaf?

A light microscope and a prepared slide. Signup and view all the answers

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

They allow gas exchange through stomata. Signup and view all the answers

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

Uptake of carbon dioxide and release of oxygen. Signup and view all the answers

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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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.