About this course
Biology for Senior Secondary 3
This unit delves into the intricate systems that maintain balance and coordination in living organisms, beginning with the regulation of the internal environment. Learners explore the concept of homeostasis—how organisms maintain stable internal conditions despite external changes. The lessons cover the roles of the kidney and liver in regulating body chemistry, the endocrine system’s hormonal control through glands, and the structure and care of mammalian skin. Plant hormones are also introduced, highlighting their role in growth and adaptation. The next section focuses specifically on plant hormones, with a deep dive into auxins and their influence on bud development, leaf fall, root initiation, and weed control. Learners compare plant and animal hormones and explore how these chemical messengers are applied in modern agriculture to enhance productivity and sustainability.
The unit explores coordination in organisms, focusing on how they detect and respond to changes in their environment. It covers both nervous and hormonal coordination, highlighting the roles of the nervous system, sensory organs, and endocrine glands. Students learn how electrical impulses and chemical messengers work together to regulate body functions, maintain homeostasis, and ensure survival. A dedicated lesson on sense organs further explores the mechanisms of smell, taste, touch, and hearing. Learners investigate chemoreceptors, taste buds, nerve endings, and the mammalian ear, gaining insight into how sensory adaptations support survival and environmental interaction.
Finally, the unit concludes with ecology of population, where learners examine how species interact within ecosystems, regulate their numbers, and maintain environmental balance. Concepts such as succession, overcrowding, population dynamics, and the influence of biotic and abiotic factors are explored. Students gain a deeper understanding of how natural mechanisms contribute to ecological stability and sustainability. Throughout the unit, learners engage with multimedia content and guided exercises designed to reinforce understanding, encourage feedback, and offer opportunities for personalized coaching. The overarching goal is to equip students with a holistic understanding of biological regulation, coordination, and ecological balance—empowering them to apply this knowledge in both academic and real-world contexts.
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