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Origins of Plants

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Questions and Answers

Why did land plants have to adapt to absorb water and nutrients?

To protect their gametes from drying out

Because water and nutrients are only available in the soil (correct)

To prevent their tissues from evaporating

To develop structures to resist wind and weather

What was one of the challenges land plants faced in reproduction?

Developing structures to resist gravity

Protecting the gametes from drying out

Absorbing water directly into cells

Releasing gametes into the water for fertilization (correct)

What is the purpose of the smooth, somewhat slippery, waxy cuticle found on plant tissues?

To help plants resist wind and weather

To prevent tissues from evaporating (correct)

To absorb water and nutrients efficiently

To protect the gametes from drying out

Why did land plants have to develop structures to help them grow against the force of gravity?

<p>To absorb water and nutrients more effectively</p> Signup and view all the answers

What did algae release into the water for fertilization?

<p>Gametes</p> Signup and view all the answers

Study Notes

Characteristics of Plants

A plant is a multicellular eukaryote, meaning it is made of cells with a true nucleus and membrane-bound organelles.
Plants have thick cell walls made of cellulose.

Origin of Plants

Plants likely evolved from threadlike green algae that lived in ancient oceans.
Evidence supporting this hypothesis includes the presence of cellulose in both modern algae and plants.
Plants first appeared in the fossil record over 440 million years ago, with simple, leafless forms.

Adaptations of Plants

Plants have a waxy waterproof carbohydrate called cellulose in their leaves and stems.
The cuticle, a coating on the stem, helps reduce water loss.
Plants are autotrophic, producing their own food through photosynthesis.
Both plants and green algae use the same type of chlorophyll for photosynthesis and store food as starch.

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Description

Learn about the origins of plants and the characteristics of the plant kingdom, including being multicellular eukaryotes with true nuclei and membrane-bound organelles. Explore how plants evolved from green algae to the diverse plant groups we see today.