A group of students wants to test the effect of temperature on the rate of respiration. The students measured the time taken for lime water to turn milk. The higher the rate of respiration the less time taken for lime water to turn milky.

A student sets up an experiment to study human respiration using lime water, test tube and a straw. Lime water is colorless in absence of CO2 and is milky in its presence. When the student blows air through straw into lime water, it turns cloudy. What can be evaluated from it?Oxygen is exhaled during respiration.Water vapours are produced during respiration.Carbon dioxide is exhaled during respiration.Glucose is produced during respiration.

A researcher is cooling a metal. She cools the metal so that the temperature of the metal drops at a constant rate. After 13 minutes of cooling, the metal is 339°C. After 25 minutes, the metal is 135°C.(a)Choose the statement that best describes how the time and the temperature of the metal are related. Then fill in the blank.As time increases, the temperature of the metal decreases.Thetemperatureofthemetaldecreasesatarateof°Cperminute. As time increases, the temperature of the metal increases.Thetemperatureofthemetalincreasesatarateof°Cperminute. (b)What was the temperature of the metal when the researcher started cooling it?°C

Deshawn wanted to find out how temperature affects the rate at which three packets of sugar dissolve in a liter of water.To find out, he performed a scientific investigation. The results from his investigation are shown below.Time (in seconds) for Sugar to Dissolve at Different TemperaturesTemperature Trial 1 Trial 2 Trial 3 Mean (average)25°C 123 s 127 s 124 s 125 s30°C 111 s 109 s 107 s 109 s35°C 98 s 101 s 97 s 99 sWhich of the following is true about the mean (average) values for the time it took the sugar to dissolve? A. The amount of time needed to dissolve the sugar stayed the same no matter what the temperature was. B. It is impossible to make any conclusions about Deshawn's experiment because he did not perform enough trials. C. The time needed for the sugar to dissolve decreased as the temperature increased. D. As the temperature increased, there was an increase in the amount of time needed to dissolve the sugar.

Explain the effects the following factors have on the rate of transpiration.4 marksHigh humidityHigh temperatureHigh light intensityHigh wind speed

The student repeated the experiment using the same apparatus. The waterstarted at 60oC. The student was surprised to find the value was lessexothermic. Explain why