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Questions and Answers
What does a high energy value on a food label indicate?
What does a high energy value on a food label indicate?
How is the energy value of food commonly measured?
How is the energy value of food commonly measured?
What is the relationship between kilocalories and kilojoules?
What is the relationship between kilocalories and kilojoules?
What can be inferred when food is burnt regarding energy?
What can be inferred when food is burnt regarding energy?
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What does examining nutrition labels help in understanding?
What does examining nutrition labels help in understanding?
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What is the primary purpose of food in living organisms?
What is the primary purpose of food in living organisms?
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During which bodily activities is energy from food utilized?
During which bodily activities is energy from food utilized?
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What could happen if the boiling tube is clamped too tightly during the practical?
What could happen if the boiling tube is clamped too tightly during the practical?
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Which apparatus is necessary to measure the temperature of water in the boiling tube?
Which apparatus is necessary to measure the temperature of water in the boiling tube?
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Which safety precaution should be considered when using the boiling tube?
Which safety precaution should be considered when using the boiling tube?
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What might be observed about energy release from food during the experiment?
What might be observed about energy release from food during the experiment?
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What should be avoided when heating the boiling tube?
What should be avoided when heating the boiling tube?
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What is the primary purpose of respiration in living organisms?
What is the primary purpose of respiration in living organisms?
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In the context of energy extraction, what process is implied when stating energy is obtained from food?
In the context of energy extraction, what process is implied when stating energy is obtained from food?
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Which of the following substances is generally required for respiration?
Which of the following substances is generally required for respiration?
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What are the typical byproducts of the respiration process?
What are the typical byproducts of the respiration process?
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Where does respiration primarily take place within living organisms?
Where does respiration primarily take place within living organisms?
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Which equation best summarizes the process of respiration?
Which equation best summarizes the process of respiration?
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Which statement about respiration is true?
Which statement about respiration is true?
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Which of the following is NOT a function of the energy released during respiration?
Which of the following is NOT a function of the energy released during respiration?
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What is the role of carbon dioxide in photosynthesis in plants?
What is the role of carbon dioxide in photosynthesis in plants?
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What is expected to happen to the carbon dioxide content in a boiling tube with green leaves in the dark?
What is expected to happen to the carbon dioxide content in a boiling tube with green leaves in the dark?
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During respiration, what gas do green plants take in and what gas do they release?
During respiration, what gas do green plants take in and what gas do they release?
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What color change would you expect in the hydrogencarbonate indicator if carbon dioxide levels rise?
What color change would you expect in the hydrogencarbonate indicator if carbon dioxide levels rise?
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Which of the following would NOT be an expected result of the practical involving gas exchange in plants?
Which of the following would NOT be an expected result of the practical involving gas exchange in plants?
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Which factor is critical for ensuring air does not leak from the tubes?
Which factor is critical for ensuring air does not leak from the tubes?
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What effect does wrapping tubes C and D with aluminum foil have?
What effect does wrapping tubes C and D with aluminum foil have?
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What is the main purpose of repositioning the leaves within the tubes?
What is the main purpose of repositioning the leaves within the tubes?
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What happens to carbon dioxide levels in plants under light conditions?
What happens to carbon dioxide levels in plants under light conditions?
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In the absence of light, what occurs in plants?
In the absence of light, what occurs in plants?
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Which statement best describes gas exchange in plants during light conditions?
Which statement best describes gas exchange in plants during light conditions?
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How do plants fare in terms of oxygen production during the day?
How do plants fare in terms of oxygen production during the day?
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Under which conditions will plants have a net uptake of oxygen?
Under which conditions will plants have a net uptake of oxygen?
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What primarily determines the net gas exchange in plants?
What primarily determines the net gas exchange in plants?
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What is the effect of dark conditions on the process of photosynthesis?
What is the effect of dark conditions on the process of photosynthesis?
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What occurs in plants under light conditions concerning gas exchange?
What occurs in plants under light conditions concerning gas exchange?
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What is the role of stomata in plants?
What is the role of stomata in plants?
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What is the net gas exchange effect in plants under dark conditions?
What is the net gas exchange effect in plants under dark conditions?
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Which process occurs continuously in green plants regardless of light conditions?
Which process occurs continuously in green plants regardless of light conditions?
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How does the net gas exchange in plants vary?
How does the net gas exchange in plants vary?
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During which of the following conditions does photosynthesis not occur?
During which of the following conditions does photosynthesis not occur?
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Which statement about gas release and uptake in plants is true when comparing light and dark conditions?
Which statement about gas release and uptake in plants is true when comparing light and dark conditions?
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What misconception do many people have regarding respiration in green plants?
What misconception do many people have regarding respiration in green plants?
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What is the main function of stomata in plants?
What is the main function of stomata in plants?
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What occurs during gas exchange in plants when the rate of photosynthesis exceeds the rate of respiration?
What occurs during gas exchange in plants when the rate of photosynthesis exceeds the rate of respiration?
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What are the two main gases exchanged through the stomata during photosynthesis and respiration?
What are the two main gases exchanged through the stomata during photosynthesis and respiration?
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Under dark conditions, what is the primary gas exchange activity in plants?
Under dark conditions, what is the primary gas exchange activity in plants?
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What is a key factor that determines the net gas exchange in plants?
What is a key factor that determines the net gas exchange in plants?
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Which structure is primarily responsible for gas exchange in plants?
Which structure is primarily responsible for gas exchange in plants?
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When preparing a biological drawing of a stoma, which factor is essential to maintain?
When preparing a biological drawing of a stoma, which factor is essential to maintain?
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What would result from the respiration rate being higher than the rate of photosynthesis in a plant?
What would result from the respiration rate being higher than the rate of photosynthesis in a plant?
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What is the net gas exchange at a potted plant's leaves on a warm sunny day at noon?
What is the net gas exchange at a potted plant's leaves on a warm sunny day at noon?
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Which condition correctly represents the gas exchange dynamics in a plant that is solely in dark conditions?
Which condition correctly represents the gas exchange dynamics in a plant that is solely in dark conditions?
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Which of the following is NOT true about stomata?
Which of the following is NOT true about stomata?
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During light conditions, what is the net effect of gas exchange in plants?
During light conditions, what is the net effect of gas exchange in plants?
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What happens if a plant's rate of respiration significantly increases beyond the photosynthesis rate?
What happens if a plant's rate of respiration significantly increases beyond the photosynthesis rate?
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Study Notes
Food as a Source of Energy
- Food provides energy for body activities like running, reading, and working, even when sleeping, for breathing and heart function
- In living organisms, energy from food is released and converted into other forms of energy supporting body functions
- Practical 7.8 demonstrates energy release from food
Burning Food Practical (Practical 7.8)
- Aim: To study energy release from food
- Materials (per group): Boiling tube, alcohol thermometer, burning spoon, Bunsen burner, insulating mat, stand and clamp, two-holed stopper, gas lighter, peanut
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Procedure:
- Fill a boiling tube with water (⅓ full)
- Insert an alcohol thermometer into the two-holed stopper, which is placed in the tube
- Secure the boiling tube on a stand using a clamp
- Record the initial water temperature (T₁)
- Heat the peanut on a burning spoon over a Bunsen burner until it burns completely
- Move the burning spoon around in the boiling tube
- Record the final water temperature (T₂)
- Caution: Do not clamp the boiling tube too tightly, do not let the thermometer bulb touch the bottom of the tube
Respiration
- Respiration is the process of releasing energy from food gradually inside cells.
- Chemical energy in food (glucose) is converted to other usable forms of energy supporting body functions.
- Oxygen is often needed during respiration.
- Carbon dioxide and water are usually produced during respiration.
- Respiration involves a series of controlled chemical reactions.
Photosynthesis and Respiration
- Photosynthesis converts carbon dioxide and water into food using light energy.
- Respiration converts food back into carbon dioxide and water releasing energy.
Energy Value of Food
- The energy value of food represents the amount of energy contained in a specific quantity of food, measured in kilocalories (kcal) or kilojoules (kJ).
- Nutrition labels on pre-packaged foods display energy values.
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Description
This quiz explores the role of food as a source of energy and includes a practical experiment to study energy release from food using a peanut. You'll learn about the mechanisms where energy is stored in food and how it's converted for bodily functions. Engage with hands-on learning through the burning food practical.
