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Dichotomous key for identifying eight different organisms based on biological characteristics.

A dichotomous key diagram featuring eight labeled organisms (dog, dandelion, house sparrow, fish, stentor, balantidium, king cobra, and ponderosa pine) with branching identification steps based on characteristics like legs, wings, habitat, and cellular structure.

A dichotomous key diagram featuring eight labeled organisms (dog, dandelion, house sparrow, fish, stentor, balantidium, king cobra, and ponderosa pine) with branching identification steps based on characteristics like legs, wings, habitat, and cellular structure.

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Show Answer Key & Explanations Step-by-step solution for: Dichotomous key, Biology worksheet, Worksheets

Problem Description:


The task involves identifying organisms based on a series of yes/no questions and characteristics. The provided images correspond to different organisms, and the key is to match each image with its correct identification using the flowchart provided.

Images:


1. A dog
2. A dandelion flower
3. A house sparrow
4. A fish (narwhal)
5. A tree (ponderosa pine)
6. A unicellular organism (Stentor sp.)
7. A snake (king cobra)
8. A plant (dandelion)

Flowchart Analysis:


We will analyze each image step by step using the flowchart provided.

---

#### Image 1: Dog
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Canis familiaris (dog).

Conclusion for Image 1: The dog matches "Canis familiaris."

---

#### Image 2: Dandelion Flower
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism with wings → Go to 3.
- Step 3: Organism is multicellular → Go to 5.
- Step 5: Organism is autotrophic → Go to 7.
- Step 7: Organism is an herb → Taraxicum officinale (dandelion).

Conclusion for Image 2: The dandelion flower matches "Taraxicum officinale."

---

#### Image 3: House Sparrow
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism with wings → Passer domesticus (house sparrow).

Conclusion for Image 3: The house sparrow matches "Passer domesticus."

---

#### Image 4: Fish (Narwhal)
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Go to 3.
- Step 3: Organism is multicellular → Go to 5.
- Step 5: Organism is heterotrophic → Go to 6.
- Step 6: Organism lives in oceans → Monodon monoceros (narwhal).

Conclusion for Image 4: The fish (narwhal) matches "Monodon monoceros."

---

#### Image 5: Tree (Ponderosa Pine)
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Go to 3.
- Step 3: Organism is multicellular → Go to 5.
- Step 5: Organism is autotrophic → Go to 7.
- Step 7: Organism is a tree → Pinus ponderosa (ponderosa pine).

Conclusion for Image 5: The tree matches "Pinus ponderosa."

---

#### Image 6: Unicellular Organism (Stentor sp.)
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Go to 3.
- Step 3: Organism is unicellular → Go to 4.
- Step 4: Organism anchored to substrate → Stentor sp. (stentor).

Conclusion for Image 6: The unicellular organism matches "Stentor sp."

---

#### Image 7: Snake (King Cobra)
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Go to 3.
- Step 3: Organism is multicellular → Go to 5.
- Step 5: Organism is heterotrophic → Go to 6.
- Step 6: Organism lives on land → Ophiophagus hannah (king cobra).

Conclusion for Image 7: The snake matches "Ophiophagus hannah."

---

#### Image 8: Plant (Dandelion)
- Step 1: Organism with two or four functional legs → Go to 2.
- Step 2: Organism without wings → Go to 3.
- Step 3: Organism is multicellular → Go to 5.
- Step 5: Organism is autotrophic → Go to 7.
- Step 7: Organism is an herb → Taraxicum officinale (dandelion).

Conclusion for Image 8: The plant matches "Taraxicum officinale."

---

Final Matches:


1. Dog → Canis familiaris
2. Dandelion flower → Taraxicum officinale
3. House sparrow → Passer domesticus
4. Fish (narwhal) → Monodon monoceros
5. Tree (ponderosa pine) → Pinus ponderosa
6. Unicellular organism (Stentor sp.) → Stentor sp.
7. Snake (king cobra) → Ophiophagus hannah
8. Plant (dandelion) → Taraxicum officinale

Final Answer:


\[
\boxed{
\begin{aligned}
1. & \text{ Canis familiaris} \\
2. & \text{ Taraxicum officinale} \\
3. & \text{ Passer domesticus} \\
4. & \text{ Monodon monoceros} \\
5. & \text{ Pinus ponderosa} \\
6. & \text{ Stentor sp.} \\
7. & \text{ Ophiophagus hannah} \\
8. & \text{ Taraxicum officinale}
\end{aligned}
}
\]
Parent Tip: Review the logic above to help your child master the concept of dichotomous key worksheet.
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