Question

The curve in the following figure shows the measurement of the concentration of carbon dioxide in a place where bonfires are being held.

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A. What can be concluded from the graph on the concentration of carbon dioxide?
B. What does the increase stem from? Explain your answer.
C. What does the decrease stem from? Explain your answer.

D. Draw a curve showing the concentration of carbon dioxide in the same place on a normal day. Explain the illustration. What can cause changes in the concentration of carbon dioxide in the air? Explain.

E. Draw the concentration of carbon dioxide in a city throughout the year. Explain your illustration.

Thank you!!!

Answer 1

A. From the graph, we can see that CO2 concentratoon initially increases and reach a peak at around 17 hours in the evening. It means bonfires in that area are used in the evening maainly. This may be due to following reasons -

1. In the city, the temperature in the evening may significantly fall down when the sun is not over the head. People use this to warm themselves.

2. People who may travel from one place to another may use bonfires to locate lanes.

B. Increasing stem depicts the concentration of CO2 of areas which either use less bonfires normally or use less bonfires when the sun is over the head.

C. Decreasing stem depicts the concentration of CO2 of areas where people stop using bonfires at night when they go to sleep. You may notice that decreasing stem is morr gradual as compared to increasing stem. This may be due to use of bonfires by travellers at night or by people living in slums.

One more possible reason for B and C is that, bonfires take some to reach their maxima. People start there bonfires at around 12 hours in the afternoon and the bonfire reaches peak at 17 hours. At this time the concentration of CO2 is maximum. Then the bonfire starts to decrease in its intensity and reaches least at around 6 hours.

D. We can assume that people living in cold areas use bonfires. So, the graph given to us is for a cold area which uses bonfires. If the area does not use bonfires, then the graph would be like -

NIGHT DAY TIME CO2 CONCENTRATION IN ATMOS PHERE

In a cold region (or when temperature is low), plant photosynthesize minimally so, CO2 concentration is high in atmosphere during day. At night, stomata in plants closes so, even less photosynthesis is there and there will be morr CO2 in night than day.

This graph is made ignoring all other factors (bonfires, combustion of fuel, pollution etc.)

E. Through out the area, when there are winters, CO2 concentration will be high. Because at cold temperature, plants minimize photosynthesis, uptake less CO2 from environment and so the atmospheric CO2 concentration is high.

Conversely, plants maximixe photosynthesis in summer and take up more CO2 from the atmosphere. So, CO2 concentration in environment is less.

winter summer TIME PHENCENTRATION IN ATMOS

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