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Grade 4 (age 9-10)

grade 4 Plant Classification

Plant Classification

Some plants grow flowers, while others like ferns and mosses never flower. We sort plants into groups by whether they flower and by their seed leaves, veins, and roots. A desert cactus or a pond lily shows how a plant's shape fits its home. Tap the grouping steps and monocots and dicots come into view side by side.

Let's classify plants

🌿 Plant Classification Criteria
①Does it flower? → Flowering / Non-flowering
②How many cotyledons? → Monocot / Dicot
③Non-flowering: ferns / mosses
④Group plants by shared features

Monocots and Dicots

🌾 How to Tell Them Apart
①Cotyledons: monocot 1 / dicot 2
②Veins: parallel (mono) / net-like (di)
③Roots: fibrous (mono) / tap (di)
④Petals: 3-multiples (mono) / 4-or-5-multiples (di)

Plants in Different Environments

🏜️ Adaptation to Environment
①Desert: cactus — water in stem, spines instead of leaves
②Pond: water lily — wide leaves float
③Mountain: pine — needle leaves reduce water loss
④Tropics: broad leaves catch lots of sunlight

Summary

Plant Classification
Plants → Flowering (mono/di) / Non-flowering (fern/moss)
Classify by flowering and number of cotyledons
Monocot Features
1 cotyledon + parallel veins + fibrous roots
Rice, corn, barley, etc.
Dicot Features
2 cotyledons + net-like veins + tap root
Rose, bean, apple tree, etc.
🎯 Key Points
①Plants are classified by features
②Flowering plants: monocots and dicots
③Non-flowering: ferns and mosses
④Plant shape adapts to environment
⑤Distinguish by veins, roots, and cotyledons

Examples and Unit Test

Example 1
A plant has parallel leaf veins and fibrous roots. Is it a monocot or a dicot?
1
A monocot has one cotyledon, parallel veins, and fibrous roots.
2
Since the veins are parallel and the roots are fibrous, it is a monocot (such as rice or corn).
▸ A monocot
Parallel veins, fibrous roots, and one cotyledon mean a monocot.
Example 2
A cactus lives well even in a dry desert. Thanks to what structures?
1
A cactus has a thick stem that stores water inside it.
2
Its leaves are also turned into spines, which reduces water loss.
▸ Thanks to its water-storing thick stem and spine-shaped leaves
The structure of a plant matches the features of the environment it lives in.
Unit-test style
Which statement about plant classification and features is correct?
①A monocot has net-like veins
②A dicot has two cotyledons
③Moss is a flowering plant
④A cactus has wide leaves that release a lot of water
⑤Rice is a dicot
▸ ② A dicot has two cotyledons
1
A dicot is characterized by two cotyledons, net-like veins, and a taproot.
2
A monocot has parallel veins (①), moss does not flower (③), a cactus has spine leaves that release less water (④), and rice is a monocot (⑤).
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