Educational worksheet illustrating a food chain pyramid with organisms and energy transfer between trophic levels.

Here is the step-by-step solution to complete your food chain and trophic pyramid worksheet.

Step 1: Create the Food Chain

The instructions ask for a food chain where the Lion is at the top (Trophic Level 4). We need to trace the energy from the bottom up using the arrows in the diagram.

1. Start: Look for what the Lion eats. The arrow points from the Zebra to the Lion.
2. Middle: Look for what the Zebra eats. The arrow points from the Grass to the Zebra.
3. Problem: This only gives us three levels (Grass $\rightarrow$ Zebra $\rightarrow$ Lion). We need four levels.
4. Adjustment: Let's look for another path. What else does the Lion eat? It eats the Leopard.
* Who does the Leopard eat? The Monkey.
* Who does the Monkey eat? The Banana Tree (or just "Tree").
* Chain: Tree $\rightarrow$ Monkey $\rightarrow$ Leopard $\rightarrow$ Lion. (This works!)

*Alternative Chain:*
Let's try one more to be sure.
* Lion eats Hyena? No, usually they compete, but let's check arrows. There isn't a clear arrow from Hyena to Lion in this specific diagram style usually, but let's stick to the clearest one.
* Let's re-examine the Grass path. Is there something between Grass and Zebra? No.
* Let's look at the Deer/Antelope. Lion eats Deer. Deer eats Grass. Still 3 levels.
* Let's look at the Jackal. Jackal eats Mouse/Rabbit? Mouse eats Grass. Lion eats Jackal? Sometimes.
* Let's go with the Tree/Monkey/Leopard/Lion chain as it clearly has 4 distinct steps shown by arrows.

Selected Food Chain:
1. Banana Tree (Producer)
2. Monkey (Primary Consumer)
3. Leopard (Secondary Consumer)
4. Lion (Tertiary Consumer / Top Predator)

*(Note: If you prefer the Grass chain, you can use Grass $\rightarrow$ Insect $\rightarrow$ Frog $\rightarrow$ Snake, but those animals aren't all linked to the Lion here. The Tree-Monkey-Leopard-Lion is the best fit for "Lion at Level 4".)*

Let's double-check another common 4-level chain often found in these diagrams:
Grass $\rightarrow$ Grasshopper $\rightarrow$ Mouse $\rightarrow$ Hawk. But the prompt requires the Lion to be level 4.
So, we must end with Lion.
Path: Grass $\rightarrow$ Zebra $\rightarrow$ ...? Nothing eats Zebra except Lion/Cheetah.
Path: Grass $\rightarrow$ Rabbit $\rightarrow$ Fox $\rightarrow$ ...? Fox doesn't go to Lion.
Path: Tree $\rightarrow$ Giraffe $\rightarrow$ ...? Giraffe goes to Lion. That's 3 levels.

Let's look closely at the Hyena.
Arrow from Zebra to Hyena. Arrow from Hyena to... nothing? Or does Lion eat Hyena? In many ecosystems, yes. If Lion eats Hyena:
Grass $\rightarrow$ Zebra $\rightarrow$ Hyena $\rightarrow$ Lion.
This is a perfect 4-level chain. Let's use this one as it uses the main savanna animals.

Final Chain Selection:
Level 1: Grass
Level 2: Zebra
Level 3: Hyena
Level 4: Lion

Step 2: Fill in the Pyramid & Rectangles

1. Organism Names & Roles:
* TL 1 (Bottom): Grass. Role: P (Producer)
* TL 2: Zebra. Role: PC (Primary Consumer)
* TL 3: Hyena. Role: SC (Secondary Consumer)
* TL 4 (Top): Lion. Role: TC (Tertiary Consumer) - *Note: The prompt calls Lion "Quaternary" in the text description but asks for TL 4. In a 4-level chain, the top is technically the Tertiary consumer, but we will follow the prompt's numbering.*

2. Trophic Levels (Left Side):
* Bottom box: TL 1
* Second box: TL 2
* Third box: TL 3
* Top box: TL 4

3. Energy Calculations (Right Side):
The rule of thumb in ecology is the 10% Rule: Only about 10% of the energy is transferred to the next level. The rest (90%) is lost as heat/metabolism.

* Given: Trophic Level 3 (Hyena) has 1,25 kJ.
* Calculate TL 4 (Lion): $1,25 \times 0,10 = 0,125$ kJ.
* Calculate TL 2 (Zebra): Since TL 3 got 10% of TL 2, then TL 2 had 10 times more. $1,25 \times 10 = 12,5$ kJ.
* Calculate TL 1 (Grass): Since TL 2 got 10% of TL 1, then TL 1 had 10 times more. $12,5 \times 10 = 125$ kJ.

Energy Values to write on the right (bottom to top):
* Next to TL 1: 125 kJ
* Next to TL 2: 12,5 kJ
* Next to TL 3: 1,25 kJ (Given)
* Next to TL 4: 0,125 kJ

Step 3: Answer the Questions

Question 4: Calculate the amount of energy transferred...
We calculated this above.
* TL 1: 125 kJ
* TL 2: 12,5 kJ
* TL 3: 1,25 kJ
* TL 4: 0,125 kJ

Question 5: How much (%) energy is transferred from one level to the next?
Standard ecological efficiency is 10%.

Question 6: If trophic level 3 has 1,25 kJ, how much energy was lost from level 2 to level 3?
* Energy at Level 2: 12,5 kJ
* Energy at Level 3: 1,25 kJ
* Energy Lost = Energy at Level 2 - Energy at Level 3
* Calculation: $12,5 - 1,25 = 11,25$ kJ.
* *(Alternatively, 90% is lost. $12,5 \times 0,90 = 11,25$ kJ)*.

Question 7: What type of energy is lost from the organism?
Energy is lost primarily as Heat (thermal energy) due to metabolic processes like respiration, movement, and digestion. Some is also lost in waste, but "Heat" is the standard scientific answer for energy loss in pyramids.

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Final Answer:

Food Chain Boxes (Bottom to Top):
1. Grass
2. Zebra
3. Hyena
4. Lion

Pyramid Labels (Left Side - Bottom to Top):
1. TL 1
2. TL 2
3. TL 3
4. TL 4

Small Rectangles (Roles - Bottom to Top):
1. P (Producer)
2. PC (Primary Consumer)
3. SC (Secondary Consumer)
4. TC (Tertiary Consumer)

Energy Values (Right Side - Bottom to Top):
1. 125 kJ
2. 12,5 kJ
3. 1,25 kJ
4. 0,125 kJ

Written Answers:
5. 10%
6. 11,25 kJ
7. Heat (or Thermal Energy)