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Authoritative PPT Summary
"Leaves of Plants" Plant PPT Courseware 3
Help Baby Ye find friends
mission accomplished:
(1) How many leaf babies are there in your group?
(2) How many types of leaves are there? Why is it so divided?
(3) You think ( ) and ( ) are the same species because ( ).
Leaf vein shape
In leaves, the parts that transport water and nutrients are called veins. Some leaf veins are distributed in parallel, such as commelina, rice, bamboo, etc. The leaf veins of some plants are distributed in a network, such as cinnamon, sunflower, impatiens, etc. Leaf veins distributed in parallel are called parallel veins.
Leaf veins distributed in a network are called reticular veins.
extracurricular extension
1. Check the information: Why do the leaves of these plants stay green all year round?
2. Prepare materials for the next class: a ruler, 4 leaves of different sizes, and a record book.
scientific concept
1. The leaves of trees are diverse, and the leaves of the same tree have common basic functional characteristics.
2. The leaves of plants are generally composed of blades and petioles, with veins on the leaves.
3. Leaves are also alive. They grow from leaf buds and eventually age and die, completing their lives.
Leaf buds → small leaves → young leaves → mature leaves → old leaves → withered leaves → fallen leaves
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