How Does Temperature Affect The Growth Rate Of Seedlingss
Two experiments were performed to investigate the effects of temperature on the growth rate pine seedlings.
Experiment 1
A batch of 60 pine seedlings (Batch I) was grown in a greenhouse under controlled temperatures. Ten plants were grown at each of six temperatures from 50 C to 300 C. These plants remained at their original temperatures 24 hours each day for two weeks. All other conditions were the same for all seedlings. The growth rates are shown in Table 1.
Table 1. Growth rates for pine seedlings in Batch I
Experiment II
A second batch of 30 pine seedlings (Batch II) was kept at 250 C during the day (12 hours). However, during the night, three batches of 10 plants were moved to each of three different temperatures. All other …show more content…
The temperature at which pine seedlings are grown affects their growth rate.
15. Consider the following statement: When pine seedlings were grown at constant temperatures of either 250 C or 300 C, their growth rates were the same.
This statement is best described as:
A. Observation
B. Assumption
C. Theory
D. Hypothesis
16. The range of temperatures used in experiment I was probably chosen for which of the following reasons?
A. They represent temperatures at which pine seedlings can be grown.
B. They represent temperatures at which pine seedlings are known to grow rapidly.
C. They represent temperatures that have not been used in previous experiments.
D. They represent the only temperatures that can be controlled in a greenhouse.
17. Based on the information in the passage, which day and night temperatures resulted in the fastest growth of pine seedlings?
A. 250 C during both day and night
B. 300 C during both day and night
C. 250 C during the day an 200 C during the night
D. 300 C during the day and 250 C during the night
18. In table 1, temperatures of both 250 C and 300 C resulted in growth rates of 22.0 mm/day. Which of the following is the best interpretation of this result?
A. The maximum possible growth rate for pine seedlings is 22.0
Experiment 1
A batch of 60 pine seedlings (Batch I) was grown in a greenhouse under controlled temperatures. Ten plants were grown at each of six temperatures from 50 C to 300 C. These plants remained at their original temperatures 24 hours each day for two weeks. All other conditions were the same for all seedlings. The growth rates are shown in Table 1.
Table 1. Growth rates for pine seedlings in Batch I
Experiment II
A second batch of 30 pine seedlings (Batch II) was kept at 250 C during the day (12 hours). However, during the night, three batches of 10 plants were moved to each of three different temperatures. All other …show more content…
The temperature at which pine seedlings are grown affects their growth rate.
15. Consider the following statement: When pine seedlings were grown at constant temperatures of either 250 C or 300 C, their growth rates were the same.
This statement is best described as:
A. Observation
B. Assumption
C. Theory
D. Hypothesis
16. The range of temperatures used in experiment I was probably chosen for which of the following reasons?
A. They represent temperatures at which pine seedlings can be grown.
B. They represent temperatures at which pine seedlings are known to grow rapidly.
C. They represent temperatures that have not been used in previous experiments.
D. They represent the only temperatures that can be controlled in a greenhouse.
17. Based on the information in the passage, which day and night temperatures resulted in the fastest growth of pine seedlings?
A. 250 C during both day and night
B. 300 C during both day and night
C. 250 C during the day an 200 C during the night
D. 300 C during the day and 250 C during the night
18. In table 1, temperatures of both 250 C and 300 C resulted in growth rates of 22.0 mm/day. Which of the following is the best interpretation of this result?
A. The maximum possible growth rate for pine seedlings is 22.0