"Treads in Trees" Walking into the Woods PPT Courseware 2

Description

"Treads in Trees" Walking into the Woods PPT Courseware 2

We call the lines on the cross section of trees called growth rings.

observation experiment

Experiment purpose: to observe and discover the characteristics of annual rings

Experimental materials: cross sections of pine trees, tung trees, yellow lotus trees, toon trees, and metasequoia trees, cross sections of pine tree branches, and their longitudinal sections.

Experimental requirements:

1. First observe the experimental materials independently;

2. Exchange materials again and continue observation;

3.Finally communicate and observe findings within the group

Think about it, discuss it

What exactly causes these phenomena of annual rings?

Do all trees have growth rings?

Growth rings are the grain on wood. When spring returns to the earth, the cells next to the bark begin to divide; the divided cells are large, thick-walled, and bright in color. Scientists call them early wood, and the dark growth rings in the trunk are formed from early wood.

After this, the tree enters the winter dormancy period again, and the cycle starts over and over again. In this way, circles of alternately dark and light rings are formed in the trunks of many kinds of trees, and each ring is part of a year's growth.

In the tropics, there are no four seasons in a year. It can also be said that there is only summer in a year. It cannot go from division to dormancy and then division again and again, so it is impossible to form annual rings.

I want to know do all trees have growth rings?

Growth rings are the grain on wood. When spring returns to the earth, the cells next to the bark begin to divide; the divided cells are large, thick-walled, and bright in color. Scientists call them early wood, and the dark growth rings in the trunk are formed from early wood.

After this, the tree enters the winter dormancy period again, and the cycle starts over and over again. In this way, circles of alternately dark and light rings are formed in the trunks of many kinds of trees, and each ring is part of a year's growth.

In the tropics, there are no four seasons in a year. It can also be said that there is only summer in a year. It cannot go from division to dormancy and then division again and again, so it is impossible to form annual rings.

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"Treads in Trees" Walking into the Woods PPT courseware:

"Treads in Trees" Walking into the Woods PPT Courseware Observe the cross section of a tree stump, what do you find? There are many lines on the cross section of the tree stump. The colors of these lines vary from dark to light. Our questions: 1. Why are there so many lines in the trunk? 2..

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition fifth grade science volume 1 industry PPT template

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