Food Webs Photosynthesis Q And APresentation Transcript
Food contains nutrients and energy needed for survival.
some of the energy in the first organism (the food) is transferred to the second organism (the eater).
When one organism is food for another
Energy Flow Through Ecosystems
Producers are organisms that take in and use energy from the Sun or some other source to produce food.
Consumers are organisms that take in energy when they feed on producers or other consumers.
When organisms die, other organisms called decomposers take in energy as they break down the remains of organisms.
1. _________ are organisms that can’t make food.
A. Plants C. Consumers B. Enzymes D. Producers Consumers
A food chain is a model, a simple way of showing how energy, in the form of food, passes from one organism to another.
When drawing a food chain, arrows between organisms indicate the direction of energy transfer.
Food chains usually have only three or four links. This is because the available energy decreases from one link to the next link.
In a food chain, the amount of energy left for the last link is only a small portion of the energy in the first link.
Short answer 10. Explain the steps of a food chain. answer Food chains cycle matter and energy through an ecosystem. Carnivores and omnivores eat consumers. Herbivores eat producers,
A food web is a series of overlapping food chains that exist in an ecosystem .
A food web provides a more complete model of the way energy moves through an ecosystem.
COMPLETION COMPLETE THE STATEMENT 3. Made of overlapping food chains answer Food webs
Short answer 9. Define a food chain and compare it with a food web answer A food chain is a simple way of showing how energy, in the form of food, passes from one organism to another, from small producers to the predator at the top end of the chain. A food web is a series of interlocking food chains in an ecosystem.
Most of the energy in the biosphere comes from the Sun.
Producers take in and transform only a small part of the energy that reaches Earth’s surface.
An ecological pyramid models the number of organisms at each level of a food chain.
The bottom of an ecological pyramid represents the producers of an ecosystem.
The rest of the levels represent successive consumers.
An energy pyramid compares the energy available at each level of the food chain in an ecosystem.
A pyramid of energy usually has three or four levels.
Only about ten percent of the energy at each level of the pyramid is available to the next level.
The Cycles of Matter
The law of conservation of mass states that matter on Earth is never lost or gained. It is used over and over again.
The carbon atoms in your body might have been on Earth since the planet formed billions of years ago. They have been recycled billions of times.
4. What has happened to energy in the environment?
Living things are divided into two groups— producers and consumers—based on how they obtain their food.
Organisms that make their own food, such as plants, are called producers.
Organisms that cannot make their own food are called consumers.
Plants and many other producers can convert light energy into another kind of energy—chemical energy.
The process they use is called photosynthesis.
During photosynthesis , producers use light energy to make sugars, which can be used as food.
Producers that use photosynthesis are usually green because they contain a green pigment called chlorophyll (KLOR uh fihl).
Chlorophyll and other pigments are used in photosynthesis to capture to capture light energy.
In plant cells, these pigments are found in chloroplasts.
The captured light energy is used to drive chemical reactions during which the raw materials, carbon dioxide and water, are used to produce sugar and oxygen.
For plants, the raw materials come from air and soil.
· Glucose is another name for sugar
Some of the captured light energy is stored in the chemical bonds that hold sugar molecules together.
Plants make more sugar during photosynthesis than they need for survival .
Excess sugar is changed and stored as starches or used to make other carbohydrates .
Plants use carbohydrates as food for growth, maintenance, and reproduction.
Consumers take in food by eating producers or other consumers.
2. Producers use light energy to make_________
A. chlorophyll C. proteins B. glucose D. starch Consumers glucose
Match each item with the correct statement A. Ecology B. Limiting factor C. Carrying capacity Producers E. Nitrogen fixation F. Energy G. Biotic factors Predation I. Air J. Abiotic factors K. Mutualism L. Water 5. ___ The 1 st level of the food chain 6. ___ One organism kills and feeds on another organism. 7. ___ An organism that makes it own food. 8. ___ Plant that contains chorophyll. D. H. D. D. D.
Some of the energy from the food you eat is used to make you move.
Some of it becomes thermal energy, which is why you feel warm or hot when you exercise.
Most cells also need oxygen to break down food.
During respiration , chemical reactions occur that break down food molecules into simpler substances and release their stored energy.
Just as in photosynthesis, enzymes are needed for the chemical reactions of respiration.
Breaking Down Carbohydrates
The type of food molecules most easily broken down by cells is carbohydrates.
Respiration of carbohydrates begins in the cytoplasm of the cell.
The carbohydrates are broken down into glucose molecules.
Each glucose molecule is broken down further into two simpler molecules.
As the glucose molecules are broken down, energy is released.
Breaking Down Carbohydrates
The two simpler molecules are broken down again. This breakdown occurs in the mitochondria of the cells of plants, animals, fungi, and many other organisms.
This process uses oxygen, releases much more energy, and produces carbon dioxide and water as wastes.
During photosynthesis and respiration, what is produced in one, is used in the other.
Photosynthesis produces sugars and oxygen, and respiration uses these products.
The carbon dioxide and water produced during respiration are used during photosynthesis
11. Describe the processes of photosynthesis and respiration answer In photosynthesis energy from sunlight trapped by the chlorophyll in plant chloroplasts is used to produce glucose from carbon dioxide and water. Oxygen is given off in the process. In respiration, oxygen combines with glucose to release stored energy. Carbon dioxide and water are given off as waste products.