Scientific Skills Exercise: Making a Bar Graph and Interpreting the Data Part F

Question

Scientific Skills Exercise: Making a Bar Graph and Interpreting the Data Part F - Interpreting the graph Select Figure 2 in the drop-down menu above the table (Figure 2) A graphical representation of the data is shown The researchers concluded that microorganisms were responsible for the disease-suppressive properties of the soil How do the results shown in Figure 2 support this conclusion? Fungal infection rate increased in seedlings grown in disease-suppressive soil that had been heated. Fungal infection rate decreased in seedlings grown in soil from the margin of the field mixed with disease- suppressive soil. A high rate of fungal infection was found in seedlings grown in soil from the margin of the field. The lowest rate of fungal infection was found in seedlings grown in disease-suppressive soil. Part G Which of the following results would have disproved the hypothesis that microorganisms are responsible for the disease-suppressive properties of soils? if seedlings had similar fungal infection rates when grown in disease-suppressive soil and soil from the margin of the field if seedlings had similar fungal infection rates when grown in 100% and 10% disease-suppressive soil if seedlings had similar fungal infection rates when grown in heated and unheated disease-suppressive Soil No results could have disproved the hypothesis that microorganisms are responsible for the dis ease- suppressive properties of soil

Explanation / Answer

According to the given data, the growth of fungal infected seedlings is high in soil from margin of field and very low in disease suppressive soil. The heating of disease suppressive soil to 50 and 800C has increased the fungal infected seedlings in the soil.

The organisms grow best in optimum conditions such as temperature, pressure, moisture etc. Most of the microorganisms grow best at 370C. Thus, most of the microorganisms lose their life at above the optimum temperature.

Part F:

Based on the above information, the death of microorganisms in the soil helps the fungi to increase and infect the seedlings.

Thus, the correct option among the following is 1.

Part G:

Based on the above information, the heated soil may result in death of microorganisms. If the presence of microorganisms effects the growth and infection of seedlings by the fungi then in normal susceptible soil the rate of fungal infection should be low when compared to soil, which is heated.

Thus, the correct option among the following is 3.

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