Carbon Dioxide Uptake and Release in Plants (Day vs. Night) - ES - LS - Matter and Energy

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5 Nsɛmmisa

Hyɛ no nsow a efi ɔkyerɛwfo no hɔ:

Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.

Akwankyerɛ

Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.

Ɛhia

DOK 3

5-LS1-1

Ɛhia

DOK 2

5-LS1-1

Ɛhia

DOK 2

5-PS3-1

Ɛhia

DOK 1

5-LS1-1

Ɛhia

DOK 2

5-LS1-1

Carbon Dioxide Uptake and Release in Plants

Plants are constantly exchanging gases with their environment. They use photosynthesis to take in carbon dioxide ($CO_2$) and release oxygen ($O_2$) during daylight, and they use cellular respiration to release $CO_2$ and take in $O_2$ all the time - even in darkness.

During photosynthesis, light energy from the Sun powers the chemical reaction that produces glucose and oxygen from $CO_2$ and water. During cellular respiration, the plant breaks down that glucose to release stored energy for growth and repair. This process releases $CO_2$ as a byproduct.

In daylight, photosynthesis occurs faster than respiration, so plants absorb more $CO_2$ than they release - the overall result is a net decrease in $CO_2$ and an increase in $O_2$ in the air. At night, photosynthesis stops because there is no sunlight to provide energy, but respiration continues. As a result, plants release a small amount of $CO_2$ back into the environment.

This 24-hour cycle illustrates how plants regulate matter and energy flow - capturing solar energy during the day and releasing stored energy at night - maintaining balance in ecosystems.

Table 1.

Time of Day	Light Level (lux)	CO₂ Concentration Change (ppm/hour)	O₂ Concentration Change (ppm/hour)	Dominant Process	Energy Flow Direction
Morning (8 AM)	5000	-40	45	Photosynthesis	Energy Stored
Midday (12 PM)	10000	-75	80	Photosynthesis	Energy Stored
Evening (6 PM)	500	-10	12	Balanced	Transition
Night (12 AM)	0	30	-25	Respiration	Energy Released

Graph of Information - Figure 1.

Graph titled 'CO₂ Concentration Change in Plants Over 24 Hours' showing CO₂ change (ppm/hour) at 8 AM, 12 PM, 6 PM, and 12 AM.

Figure 2.

Diagram showing daytime photosynthesis with CO₂ in and O₂ out, and nighttime respiration with O₂ in and CO₂ out in plants.

Ɛhia

Does light availability change which gases plants use more? Explain using evidence and reasoning.
Claim:
Evidence:
Reasoning:

DOK 3

5-LS1-1

Ɛhia

Based on Table 1, how does $CO_2$ concentration change from daytime to nighttime? Use evidence in your answer.

DOK 2

5-LS1-1

Ɛhia

Why does photosynthesis stop at night?

Plants run out of CO₂

Plants need darkness to rest

There is no sunlight to power the reaction

Plants only use oxygen at night

DOK 2

5-PS3-1

Ɛhia

During which time of day do plants release CO₂, instead of absorbing it?

Morning

Midday

Evening

Night

DOK 1

5-LS1-1

Ɛhia

Explain how energy flow in plants changes from daytime to nighttime.

DOK 2

5-LS1-1

Carbon Dioxide Uptake and Release in Plants (Day vs. Night) - ES - LS - Matter and Energy

Carbon Dioxide Uptake and Release in Plants

Table 1.

Graph of Information - Figure 1.

Figure 2.

Does light availability change which gases plants use more? Explain using evidence and reasoning.Claim: Evidence: Reasoning:

Based on Table 1, how does $CO_2$ concentration change from daytime to nighttime? Use evidence in your answer.

Why does photosynthesis stop at night?

During which time of day do plants release CO₂, instead of absorbing it?

Explain how energy flow in plants changes from daytime to nighttime.

Carbon Dioxide Uptake and Release in Plants

Table 1.

Graph of Information - Figure 1.

Figure 2.

Does light availability change which gases plants use more? Explain using evidence and reasoning.Claim: Evidence: Reasoning:

Based on Table 1, how does $CO_2$ concentration change from daytime to nighttime? Use evidence in your answer.

Why does photosynthesis stop at night?

During which time of day do plants release CO₂, instead of absorbing it?

Explain how energy flow in plants changes from daytime to nighttime.

Does light availability change which gases plants use more? Explain using evidence and reasoning.
Claim:
Evidence:
Reasoning:

Does light availability change which gases plants use more? Explain using evidence and reasoning.
Claim:
Evidence:
Reasoning: