三年级的自然常识 (2011-09-21 20:59:49)

Grade 3

Plant Growth and Development
Subject: Plant life cycle

Students observe each stage in the life cycle of a simple plant. Working with Wisconsin Fast Plants? (Brassica rapa), which germinate, mature, and go to seed within a 40-day period, students plant seeds and watch the seedlings emerge. Later, they thin and transplant seedlings. As they watch their plants grow, students learn that plants need nutrients from the soil, as well as water and light, to thrive. As the unit expands to focus on the interdependence of living things, students cross-pollinate the flowers with dried honeybees. Finally, they harvest mature seeds and determine seed yields. These experiences deepen students’ understanding of the characteristics of living organisms and their relationship with and dependence on their environment.

 Magnetism and Electricity

The Magnetism and Electricity Module explores permanent magnetism, simple electrical circuitry, and electromagnetism. Knowledge gained in the first three activities is applied in the fourth as the students make telegraph units and develop a code system to communicate with each other.

 Earth Materials

The Earth Materials Module puts students in touch with the basic building materials from which the earth is made. They experience simulated and real rocks, investigate minerals and their properties, and learn techniques used by geologists for taking apart and identifying several important rocks and minerals.