Unit 3: Energy Flow Review

In the food web pictured, what would be a direct impact of an increase in the amount of toads in the ecosystem?

• an increase in the population of squirrels

• a decrease in the population of owls

• an increase in the population of snakes

• a decrease in the rabbit population

Organisms that use energy from the sun to make their own food are called

• Detritivores

• Herbivores

• Omnivores

• Producers

In food chains, the flow of energy is ALWAYS _________.

• One-way

• Two-way

• Reversible

• Uncontrolled

The figure pictured shows a trophic pyramid for an ecosystem. What

happens to the amount of energy in the pyramid as it moves up through the

different levels?

• Energy increases by 10% each level

• Energy decreases by 90% each level

• Energy decreases by 10% each level

• Energy increases by 90% each level

The following organisms make up a food chain:

algae --> fish --> bear. If you were to place the bear into the trophic pyramid to the

right, the bear would go on level _____ and have ________ amount of energy

available to it.

• A; the least

• C; the least

• A; the greatest

• B; an intermediate

Imagine you are creating a drawing of a trophic pyramid with the following food chain: Seed --> Rodent --> Hawk. The seeds start out with 1700 calories worth of energy. What would be the amount of energy (in calories) for each level above seeds? HINT: Remember, each level higher than producer has 90% less energy than the one below it.

Answer explanation

Your answers should be:

Producers - 1700 cal

2nd Level Consumers: 170 cal

3rd Level Consumers: 17 cal

You loose 90% of the available energy each level you move up the pyramid. Mathematically, you'd multiply the amount of energy you have by 0.10 to find how much energy you'd have at the next level.

The purpose of photosynthesis is to

• make ATP for humans.

• build proteins in plants.

• store solar energy as sugar.

• make ATP for humans and store solar energy as sugar.

In which organelle does photosynthesis occur?

• Mitochondria

• Lysosome

• Chloroplast

• Nucleus

NADPH and ATP are produced during what part of photosynthesis?

• light-dependent reaction

• Calvin Cycle

• light-independent reaction

• Citric acid Cycle

Overall, photosynthesis is a reaction that

• absorbs energy, and is exothermic.

• absorbs energy, and is endothermic.

• releases energy, and is exothermic.

• releases energy, and is endothermic.