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"Silkworm Baby Changes" Let's Raise Silkworms PPT Courseware
learning target
1. Observe and understand the growth process of silkworms.
2. Observe and understand the morphological change process of silkworms from larvae to adults.
spinning silk and cocoon
Silkworm is doing pre-camp work. He will raise his head and make an 8-shaped wave, that is, first cover the surrounding area with silk.
Silkworms hang themselves in mid-air and weave a web in the shape of a cocoon.
The cocoon is woven deeper and deeper, which is the so-called self-binding of the cocoon.
Cutting silkworm cocoon
It is relatively difficult to cut through the cocoon, so you have to be gentle. You have to be careful not to hurt yourself, but also be careful not to hurt the baby silkworm inside. In actual operation, you can tilt the cocoon upright so that the chrysalis is close to the lower end, and then use scissors or a blade to cut a thin opening from the upper end (refer to the picture above left).
3. (1) The "Farming and Weaving Picture" painted by the Southern Song Dynasty painter Lou Shou records that the ancients tied straw into "( )" to help silkworms ( ).
(2) Newly born silkworm babies are brown and have a lot of fine hairs. They are about the same size as ants, so they are called ( ).
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