Data logger
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1. The document describes an experiment to determine which condition - presence or absence of light - causes a plant to lose more water through transpiration. 2. The experiment uses a data logger to record humidity levels inside a plastic bag wrapped around a plant branch under both light and dark conditions. 3. The results show that the plant loses more water and the humidity inside the bag decreases more rapidly when the plant is in the light condition compared to the dark condition.
Data logger
- 1. DATA LOGGING INFORMATION AND COMMUNICATION TECHNOLOGY IN SCIENCE (SSI 3013) Members Matric Number Umi Nabilah Binti Ismail D20101037464 Nabilah Binti Komaruddin D20101037466 Nazratul Ilyana Binti Mohamad D20101037470
- 3. SCIENTIFIC CONCEPT Transpiration is a process loss of water in the form of water vapor from part of plant especially leaves but also in stems, flower and roots. Leaves transpiration occur through stomata. Transpiration cools plants and enable mass flow of mineral nutrients and water from roots to shoots.
- 4. PROBLEM STATEMENT To study which condition either present or absent of light will causes the plant loses water most.
- 5. OBJECTIVE To determine which condition causes the plant loses water most. To understand the transpiration phenomenon. To examine the phenomenon by using data logger.
- 6. ENGAGE Which plant will lose water most? Why des it happened?
- 7. EMPOWER Planning and doing your experiment:
- 8. PROCEDURE: Done the experiment in the laboratory (presence of light). Set up the apparatus as the diagram above. Place the humidity sensor inside the plastic bag and wrapped around a branch of the plant. Set the data logger. Start the data logger and record the result for 16 hours. Repeat the experiment by place the plant at the different place that are inside the cupboard (absence of light).
- 9. RESULT:
- 10. Table of Humidity inside the Laboratory
- 12. Graph of Humidity inside the Laboratory
- 13. Table of Humidity inside the Cupboard
- 15. Graph of Humidity inside the Cupboard
- 16. DISCUSSION: Question: 1. What cause the plastic bag to turn cloudy at the end of the experiment? 2. What triggers the water to be expelled from the plant? 3. Where does the water which has been expelled come from? 4. Which structure in the leaf helps to draw water out? 5. Which structure helps to control the opening and closing of stomata?
- 17. Answer: 1. There were water droplets in the bag. The bag may appear cloudy because of water vapor in the bag. 2. The inner side of the plant is in hot condition. Thus, to make it cooler the plant has to expel the water out from its body. 3. The water comes from the soil. The uptake of water from the soil is via osmosis, and then the water enters neighboring cells until it reached the pore.
- 18. 4. The structure which responsible in drawing the water out is stomata. Stomata are a special type of pore opening on leaves of plants. They are designed to absorb water from sources such as rain while also removing excess water in the plant through transpiration. 5. The regulation of opening and closing of stomata is controlled by guard cell. It is one of the paired cells in the epidermis of a plant that control the opening and closing of a stoma of a leaf. When swollen with water, guard cells pull apart from each other, opening the stoma to allow the escape of water vapor and the exchange of gases. When drier, guard cells become more flaccid and move closer together, allowing the plant to conserve water.
- 19. ENHANCE Sweating is uncomfortable and makes us sticky, but it cooler the body. If human have a process that can cool down their body temperature, through sweating, so, what about plant? Explain how does it occur?
- 20. 1. Sweating in human The process of sweat evaporating from the body is responsible for the cooling effect. By sweating, our body releases moisture onto our skins and in the process, heat is taken away from our body. When we sweat, our skin and clothing become covered with water, if the atmospheric humidity is low, this water evaporates easily. The heat energy needed to evaporate the water comes from our bodies, so this evaporation cools our bodies, which have too much heat. For the same reason splashing water on us when it is hot feels good. Being wet during cold weather, however can excessively chill us because of this same evaporation effect. Because this mechanism uses water, we need to replace lost fluids by drinking more fluids in hot weather. This is especially true after exercising or working in hot weather.
- 21. 2. Sweating in plant Transpiration happens when plants give off water vapor through tiny pores in their leaves. This is the plant way of getting rid of waste, just like people and animals sweat when they are hot. This water vapor evaporates into the air and is stored in the atmosphere until it becomes clouds or precipitation.
- 22. EXTENSION Experiment can be repeated or stopped at any time as most of the work is taken over by the data logger It can save our time The pattern of since the Unique temperature and experiments do not humidity changes can Features take a long period. be observed on the same graph More than one sensor can be used simultaneously (humidity and temperatures sensor)