In this Grade 7 Life Science lesson from Chapter 10, students learn how plants capture sunlight and convert it to chemical energy through photosynthesis, producing sugars and oxygen from water and carbon dioxide. Students also explore how plants store energy as starch or sugar, and why plants are classified as autotrophs and producers. The lesson connects to hands-on investigations that challenge students to examine what materials plants actually need to grow.
Section 1
Plants Convert Sunlight Into Chemical Energy
Through photosynthesis, plants transform sunlight into sugars using water and carbon dioxide. This makes plants producers or autotrophs because they create their own food rather than consuming other organisms.
Section 2
Plants Store Energy in Different Forms
Plants store excess sugar as starch in various parts like roots, stems, and tubers. When needed, cellular respiration breaks down these starches back into sugars, releasing energy for the plant's survival and growth.
Section 3
Plants Respond to Environmental Stimuli
Plants sense and react to gravity, touch, and light. Stems grow upward while roots grow downward. Hormones like auxin help plants bend toward light sources, while tendrils respond to touch by wrapping around objects.
Section 4
Plants Adapt to Survive Diverse Environments
Different plants develop specialized adaptations for various climates. Grasses grow deep roots for drought survival, while trees may lose their leaves or maintain needle-shaped leaves depending on the seasonal challenges they face.
Section 5
Plants Adjust to Seasonal Changes
Decreasing daylight triggers dormancy in many plants. Deciduous trees lose leaves when winter approaches, while flowering patterns depend on day length, with some plants blooming during short days and others during long days.
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Section 1
Plants Convert Sunlight Into Chemical Energy
Through photosynthesis, plants transform sunlight into sugars using water and carbon dioxide. This makes plants producers or autotrophs because they create their own food rather than consuming other organisms.
Section 2
Plants Store Energy in Different Forms
Plants store excess sugar as starch in various parts like roots, stems, and tubers. When needed, cellular respiration breaks down these starches back into sugars, releasing energy for the plant's survival and growth.
Section 3
Plants Respond to Environmental Stimuli
Plants sense and react to gravity, touch, and light. Stems grow upward while roots grow downward. Hormones like auxin help plants bend toward light sources, while tendrils respond to touch by wrapping around objects.
Section 4
Plants Adapt to Survive Diverse Environments
Different plants develop specialized adaptations for various climates. Grasses grow deep roots for drought survival, while trees may lose their leaves or maintain needle-shaped leaves depending on the seasonal challenges they face.
Section 5
Plants Adjust to Seasonal Changes
Decreasing daylight triggers dormancy in many plants. Deciduous trees lose leaves when winter approaches, while flowering patterns depend on day length, with some plants blooming during short days and others during long days.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter