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Not Everything Green is a Plant

Introduction to the changing definition of plants.

💡 Did you know?

Our understanding of the plant kingdom has evolved! Fungi and cyanobacteria (often called blue-green algae) are no longer considered plants, even though older classification systems placed them there.

📝 Study Tip: When classifying organisms, look beyond superficial traits. Just because an organism is green (like cyanobacteria) or has a cell wall (like fungi) does not automatically make it a part of Kingdom Plantae!

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checklist

Before We Begin

Checklist of prior concepts needed for this chapter.

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Before We Begin — Check What You Know

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quiz

What do you already know?

Diagnostic questions covering the major plant groups.

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An industrial food scientist is sourcing natural water-holding substances (hydrocolloids) to thicken a new line of commercial jellies and ice creams. Based on the classification of algae, which of the following sources and products would be the most appropriate choice?

Hint

Concept: Algae. Remember which specific class of algae is famous for providing the commercial base used to grow microbes and prepare jellies.

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Chat

Feynman on Changing Kingdoms

Feynman explains why the plant kingdom boundaries shifted.

Learners can ask follow-up questions and keep the thread going.

Here's what everyone gets wrong about plants: we used to think anything that grew out of the dirt and didn't run away was a plant. If it had a stiff box around its cells—a cell wall—scientists just slapped a 'Plant' label on it.

But that's like classifying a medieval knight and an armadillo as the same animal just because they both wear armor! Nature is way more subtle than that. We eventually looked closer and realized fungi are building their cell walls out of chitin—the exact same stuff in a beetle's shell. And those 'blue-green algae'? They're actually cyanobacteria playing a completely different game of cellular chemistry, without even a real nucleus. Just having a wall isn't enough; you have to look at how the wall is built and what's happening inside the house.

If you were a biological detective trying to sort these out, what kind of chemical clues would you look for to prove a mushroom and a fern don't belong in the same kingdom?

over 2 years ago

concepts · 6

← previousWelcome To Biological Classification next →Systems Of Classification & Taxonomy

If you were a biological detective trying to sort these out, what kind of chemical clues would you look for to prove a mushroom and a fern don't belong in the same kingdom?

Welcome To The Plant Kingdom

Not Everything Green is a Plant

Before We Begin

What do you already know?

Feynman on Changing Kingdoms

Systems Of Classification & Taxonomy

Algae: The Primary Producers

Bryophytes: Amphibians Of The Plant Kingdom

Pteridophytes: The First Vascular Plants

Gymnosperms & Angiosperms: The Seed Plants

Chapter Review

Not Everything Green is a Plant

Before We Begin

What do you already know?

Feynman on Changing Kingdoms