Activity 01
Seed Germination Race
Students grow moong or gram seeds in petri dishes under different conditions: full light, complete darkness, and with varying amounts of water. They measure the radicle and plumule length daily for a week and plot a growth curve to see which conditions are optimal.
Compare the physiological effects of auxins and gibberellins on plant growth.
Facilitation TipEncourage students to formulate a clear hypothesis before starting the experiment.
What to look forUse an exit ticket where students have to match a list of plant hormones to their primary functions, or answer a single question like 'Which hormone would you use to prevent premature fruit drop in an orchard and why?'
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Activity 02
Demonstrating Phototropism
A simple experiment using a cardboard box with a small hole and a potted seedling inside. Over a few days, students observe the plant stem bending towards the light source, a classic demonstration of auxin action.
Explain the concept of photoperiodism and classify plants into short-day, long-day, and day-neutral categories.
Facilitation TipSet up two boxes, one as a control with a central top opening, to make the comparison clear.
What to look forA section in the term exam with questions requiring students to compare the effects of two hormones, analyse a graph showing a plant's response to photoperiod, or design an experiment to test the effect of a growth regulator.
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Activity 03
Hormone Expert Jigsaw
Divide the class into five 'expert' groups, each assigned one phytohormone. After researching, students regroup into 'jigsaw' groups with one expert from each hormone to teach their peers about their assigned regulator.
Analyze the role of ethylene as a gaseous plant growth regulator.
Facilitation TipProvide a structured note-taking sheet to guide the information sharing in the jigsaw groups.
What to look forStudents create a flowchart or concept map illustrating the life cycle of a flowering plant, annotating where each major hormone and environmental cue (light, temperature) plays a critical role.
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Generate Complete Lesson→A few notes on teaching this unit
Start with observable phenomena like a sprouting seed or a bending plant before introducing the invisible cause: hormones. Use analogies, like comparing phytohormones to traffic signals that tell the plant when to 'go', 'slow down', or 'stop'. Group activities like the 'Hormone Expert Jigsaw' can break down the dense information and encourage peer learning.
By the end of this topic, your students will be able to explain how both internal chemical signals and external environmental cues work together to control the entire life story of a plant.
Watch Out for These Misconceptions
Plant hormones work exactly like animal hormones, produced in glands and transported through a circulatory system.
Plants lack specific glands. Phytohormones are produced in various cells and tissues and can act locally or be transported through vascular tissues like xylem and phloem. Their action is often less specific than animal hormones.
Plant growth is just about the plant getting bigger.
Growth is the irreversible increase in size, but development is a broader term that includes growth, differentiation (cells specialising), and morphogenesis (the development of form and structure).
Photoperiodism is about the amount of light a plant needs, so long-day plants need lots of bright light.
Photoperiodism is about the duration of the light or, more critically, the dark period. A long-day plant requires a light period longer than a certain critical length (or a dark period shorter than a critical length) to flower.
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