Biotic and Abiotic Factors
Symbiosis
Photosynthesis and Cell Respiration
Food Webs
100
Is food a biotic or an abiotic factor and why?
Biotic because all food was once alive.
100
Commensalism is a relationship between two organisms in which one organism is _________________ and the other is ___________________.
...one organism is benefitted and the other is not impacted (neither benefitted not harmed).
100
True or False: Only plants do photosynthesis, and only humans and animals do cell respiration.
False. Only plants do photosynthesis, but plants, animals, and humans all do cell respiration.
100
Using this food web, can you find and identify an example of a predator-prey relationship?
Owl (predator) and mouse (prey), fox (predator) and squirrel (prey)
200
How might a drought affect the carrying capacity for deer in a forest?
A drought would reduce the amount of resources available to deer such as food and water, lowering the carrying capacity.
200
Which organisms in this model might be competing for the same food source?
The fox and the owl compete for the wood mouse. The shrew and the wood mouse compete for the earthworm.
200
Come up to the board and write the chemical equation for photosynthesis.
CO2 + H2O --> C6H12O6 + O2 (or carbon dioxide + water --> glucose + oxygen)
200
If the population of a primary consumer increases, explain what might happen to the producer population?
The producer population would decrease because more organisms would be eating the producer.
300
What might happen to a predator population if its main prey population suddenly decreases?
The predator population will decrease due to lack of food.
300
Provide an example of a parasitic relationship.
Tick (parasite) and dog (host), lice (parasite) and humans (host).
300
How are photosynthesis and cell respiration dependent on one another?
The outputs (products) of photosynthesis are the inputs (reactants) for cell respiration, and the products of cell respiration are the reactants for photosynthesis.
300
Why do we need proteins, carbohydrates, and lipids/fats to grow and stay healthy?
Carbohydrates provide quick energy. Proteins help build and repair tissues. Fats provide long-term energy storage.
400
How would a decrease in plant life affect herbivores and then carnivores in a food web?
Herbivores would decrease first due to lack of food, then carnivores would decrease as the herbivores they feed on decrease.
400
Bees visit flowers to drink sugary nectar for food, and in doing so, they pick up pollen and transfer it to other flowers, allowing the plants to reproduce. What type of relationship do the bees and flowers have?
Mutualistic
400
What is glucose, and how do plants make it?
Glucose is a sugar that plants produce via photosynthesis using light energy, carbon dioxide, and water. Plants use glucose to feed themselves and the the organisms that eat plants.
400
What role do decomposers play in food webs?
They break down dead organisms to cycle matter back into the food web.
500
How could a sudden increase in one population lead to a decrease in another?
A sudden increase in a predator population (e.g., wolves) would lead to a sudden decrease in its prey population (e.g., rabbits).
500
Provide an example of cooperation between species in an ecosystem.
Wolves hunting in packs, honeyguides and humans (honeyguides lead humans to hives, humans eat the honey and leave behind larvae for honeyguides to eat).
500
How does the glucose made by plants end up helping animals survive?
Glucose provides the energy animals need to live, move, and grow. Animals break down glucose to release usable ATP energy during cell respiration.
500
Explain why there are fewer organisms at the top of the food web than the bottom. Use the vocabulary terms "trophic level" and "10% rule" in your answer.
The 10% rule tells us that only 10% of available energy is transferred from one trophic level to the next. Therefore, there is less energy available at the top of the food web, and fewer organisms can be sustained.