Africa Storyline Unit Review

Buffalo need to consume 100 kcal per kilogram of body weight each day. If a buffalo weighs 500 kg, how many kcals does it need to eat per day?

• 500 kcal

• 5,000 kcal

• 50,000 kcal

• 500,000 kcal

Answer explanation

A buffalo weighs 500kg and needs 100 kcal/kg. So, 500 x 100 = 50,000 kcal/day

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When is it beneficial for organisms to hunt solo?

• when their prey is large in size

• when their prey is fast moving

• when their prey is small in size

• when their prey is nocturnal

Answer explanation

Small prey have a lower body mass, so they will contain less calories. With so few calories there wouldn't be a benefit to sharing.

On the other hand, when the prey is larger than the hunters, they can share and it will sustain the group for a length of time.

What is the relationship between mass and kcal?

• the larger an organism is, the more energy it contains

• the larger an organism is, the less energy it contains

• the larger an organism is the faster it moves

• the larger an organism is, the less energy it needs

Answer explanation

Larger organisms (greater mass) have more molecules creating their body and allowing them to function. More molecules = more bonds = more energy

Grab a calculator:

fish = 400 kcal

jellyfish = 100 kcal

squid = 350 kcal

If a sea turtle eats 2 fish, 1 jellyfish, and 3 squid, how many calories did it consume?

• 850 kcal

• 1600 kcal

• 1200 kcal

• 1,950 kcal

Answer explanation

2 fish = 2 x 400 = 800 kcal

1 jellyfish = 1 x 100 = 100 kcal

3 squid = 3 x 350 = 1050 kcal

800 + 100 + 1050 = 1950 kcal consumed

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What trophic level does the snake belong to?

• producer

• primary consumer

• secondary consumer

• tertiary consumer

Answer explanation

Grass is the producer

Grasshopper is the primary consumer

Bird and Frog are both secondary consumers

That means the snake is the tertiary consumer.

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If there are 2,000,000 kcal available at the producer level, how many kcal will be available at the secondary consumer level?

• 2,000,000

• 200,000

• 20,000

• 2,000

Answer explanation

Producers = 2,000,000 kcal

Primary consumers = 200,000 kcal

Secondary consumers = 20,000

To calculate the 10%, you can either divide by 10 each time you go up a level, or multiply by 0.1 each time you go up a level.

Which starfish would provide the most kcals?

• First one

• Second one

• Third one

• Fourth one

Answer explanation

The first one is the largest, therefore it will provide the greatest amount of energy.

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How would this starfish population change over time if sea turtles (predators) preferred to eat dark colored starfish?

• the population would become larger in size

• the population would become darker in color over time

• the population would become smaller in size

• the population would become lighter in color over time

Answer explanation

If the darker colored starfish are being consumed, they are not able to pass down their genes as frequently. Light colored starfish would then have offspring that are better able to survive. Over time, the light colored starfish would become more plentiful in the habitat.

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What is a keystone species?

• a species that lives in warm, rocky environments only

• a species that keeps the ecosystem balanced and if removed it would fall apart

• a species that consumes that greatest amount of kcal in an ecosystem

• a species that is the most camouflaged to its habitat

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Based on these results, whose blood was found at the crime scene?

• Bob

• Sue

• John

• Lisa

Answer explanation

John's bands perfectly match the bands from the blood stain.

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