Food as a Source of Energy - Practical 7.8

Food provides the energy needed for body functions like movement, reading, and thinking, even when resting.

The energy stored in food is released and transformed into other energy forms for bodily activities.

A lab experiment designed to observe energy release from food.

A glass tube used to hold water in the experiment.

Measures temperature changes in the water.

A heat source used in the experiment.

Important steps to take to prevent accidents during the experiment, like avoiding clamping the tube too tightly.

The experiment investigates the energy produced when peanuts are burned to release energy

The amount of energy a food provides.

A unit of energy, often used to measure the energy value of food.

Energy is released, either in a controlled or uncontrolled situation.

Labels on food packages that provide information about the food's nutritional value, including energy value.

Kilocalories or kilojoules, often on nutrition labels, indicate energy values of foods.

Burning a peanut in a spoon over a Bunsen burner to heat the water in the boiling tube.

The temperature of water in the boiling tube before heating.

The temperature of water in the boiling tube after heating the burnt peanut.

Spoon used to hold and heat the burning peanut.

The bulb of the thermometer should not touch the bottom of the boiling tube.

Protective eyewear to wear during the experiment.

A surface to place the burning spoon on to contain heat.

The process where living organisms break down food to release energy.

Food contains stored energy that can be released through respiration, providing energy for bodily functions.

To release energy stored in food for bodily processes like movement, growth, and thinking.

The amount of food considered in a single serving, usually specified in grams or milliliters.

A nutrient essential for building and repairing tissues, making enzymes, and other vital functions.

The total amount of fat in a food, including saturated and unsaturated fats.

A type of fat typically found in animal products and some plants, which is linked to heart health concerns if consumed in excess.

An unhealthy type of fat created during food processing, which can raise cholesterol levels.

A waxy substance found naturally in the body and in certain foods, which plays a role in various bodily functions.

A major source of energy for the body, found in foods like bread, pasta, and fruit.

Information on the content of a food, typically found on the product label, including calories, proteins, fats, carbohydrates, and vitamins.

A type of sugar that is the main source of energy for most living things.

The process of changing energy from one form to another. During respiration, chemical energy in food is converted to useful forms of energy.

Oxygen is usually needed during respiration. It acts as an electron acceptor, helping to break down glucose and release energy.

Carbon dioxide and water are the waste products of respiration.

Respiration involves a series of controlled chemical reactions that release energy from food.

The chemical reactions in respiration are carefully controlled to prevent a sudden release of all energy.

A simplified equation that shows the overall process of respiration: Glucose + Oxygen → Carbon Dioxide + Water + Energy

The process plants use to make their own food using sunlight, carbon dioxide, and water.

The process of plants taking in carbon dioxide and releasing oxygen during photosynthesis, and taking in oxygen and releasing carbon dioxide during respiration.

Plants take in carbon dioxide and water during photosynthesis.

Plants release oxygen during photosynthesis.

Plants take in oxygen during respiration.

Plants release carbon dioxide and water during respiration.

A solution that changes color based on the amount of carbon dioxide present. Red means low carbon dioxide, yellow means high carbon dioxide, and purple means normal levels.

The overall exchange of gases in plants, taking into account both photosynthesis and respiration.

When a plant takes in more of a gas than it releases.

When a plant releases more of a gas than it takes in.

Plants take in carbon dioxide and release oxygen because photosynthesis is faster than respiration.

Plants take in oxygen and release carbon dioxide because respiration is the only process happening.

Tiny pores on plant leaves that allow gases to pass in and out.

Stomata allow carbon dioxide, oxygen, and water vapor to move in and out of the plant.

Stomata open and close based on factors like light intensity, carbon dioxide concentration, and water availability.

The outer layer of cells on a leaf, where stomata are found.

A slide containing a thin section of a leaf epidermis, ready for viewing under a microscope.

The ability of a microscope to enlarge an object's image.

A detailed and accurate drawing of a specimen observed under a microscope.

A diagram showing the different parts of a specimen and labeled with their names.

Photosynthesis and respiration occur simultaneously in plants, with the rate of each process depending on conditions.

The overall gas exchange in plants is determined by which process is faster: photosynthesis or respiration.

False, plants need oxygen for respiration to release energy from food.

True, when respiration is faster, plants release more CO2 than they take in.

In sunlight, plants have a net uptake of carbon dioxide and a net release of oxygen, due to photosynthesis being faster than respiration.

Stomata are the primary structures for gas exchange in plants.

Plants have a net uptake of carbon dioxide and a net release of oxygen because photosynthesis is faster than respiration.

Plants have a net uptake of oxygen and a net release of carbon dioxide because respiration is the only process happening.

The speed at which plants convert sunlight, carbon dioxide, and water into food.

The speed at which plants break down food to release energy.

When a plant takes in more carbon dioxide than it releases.

When a plant releases more oxygen than it takes in.

Plants take in carbon dioxide and release oxygen because photosynthesis is faster than respiration.

Plants take in oxygen and release carbon dioxide because respiration is the only process happening.

Photosynthesis uses sunlight to make food (glucose) and release oxygen, while respiration breaks down glucose to release energy and carbon dioxide. Both happen simultaneously in plants.

In light, photosynthesis is faster, resulting in a net uptake of carbon dioxide and release of oxygen. In dark, respiration is the only process, leading to a net release of carbon dioxide and uptake of oxygen.

Tubes B and D serve as control groups. They ensure that any changes observed in tubes A and C are due to the presence of green leaves, not other factors like light or temperature.

Tube A, with green leaves, turns purple, indicating a decrease in carbon dioxide. Tube B, without leaves, stays red, suggesting no change in carbon dioxide. This shows that green leaves under light conditions take in carbon dioxide.

Aluminum foil blocks light. Tubes C and D are control groups to see if the presence of light is necessary for any color changes in the indicator.

The indicator in tube C, with green leaves and no light, remains red, while tube D, without leaves and no light, also stays red. This indicates that leaves don't take in carbon dioxide in the dark.

In the light, leaves take in carbon dioxide and release oxygen. This process is called photosynthesis, where plants use sunlight to make their own food.

In the dark, leaves take in oxygen and release carbon dioxide. This process is called respiration, where plants break down food for energy.

This experiment shows that green leaves take in carbon dioxide under light conditions, demonstrating that photosynthesis is happening. In darkness, leaves don't take in carbon dioxide, showing that respiration is slower than photosynthesis in the light.

The process where plants take in carbon dioxide and release oxygen for photosynthesis, and take in oxygen and release carbon dioxide for respiration.

Through tiny pores called stomata on their leaves.

The relative rates of photosynthesis and respiration.

Plants have a net uptake of carbon dioxide and a net release of oxygen because photosynthesis is faster.

Plants have a net uptake of oxygen and a net release of carbon dioxide because respiration is the only process happening.

To break down food and release energy for growth and other processes.

To make their own food using sunlight, carbon dioxide, and water.

The process by which plants use sunlight, carbon dioxide, and water to make their own food (glucose) and release oxygen.

The process by which plants break down glucose to release energy for growth, repair, and other life processes, using oxygen and releasing carbon dioxide and water.

Plants take in oxygen and release carbon dioxide because respiration is the only process happening.