Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Describe three adaptations of common tropical organisms.
• Identify specific Ghanaian organisms with these adaptations.
• Explain how adaptations help organisms survive.
• Understand the importance of field observation.

Lesson summary

This lesson explores the fascinating topic of adaptation. We will investigate how plants and animals in our own Ghanaian environment have developed special features and behaviours to survive and thrive in their specific homes or habitats. From the hot, grassy savannah to the damp, dense rainforest and the salty coastal lagoons, life has found incredible ways to cope with challenges like finding food, avoiding predators, and dealing with the climate. Understanding adaptation is crucial because it helps us appreciate the rich biodiversity of Ghana and recognise why protecting our natural environments is so important for the survival of these unique organisms.

Lesson notes

2.1 Foundational Definitions Habitat: A habitat is the natural home or environment where an organism (plant or animal) lives. It provides the organism with everything it needs to survive: food, water, shelter, and a place to reproduce. *Example: A pond is the habitat for a tilapia; the tall grass of the Accra plains is a habitat for the grasscutter (akrantie).* Adaptation: An adaptation is any inherited feature (a characteristic or behaviour) that helps an organism to survive and reproduce more successfully in its habitat. Organisms that are well-adapted have a better chance of passing their features on to their offspring. 2.2 Types of Adaptations

There are three main types of adaptations. It is important to remember that most organisms have a combination of all three. Structural Adaptations: These are physical features of an organism's body that help it to survive. They are parts of the body you can see and touch. Example 1 (Animal): The Camel's Hump. The hump stores fat, which can be broken down to provide both energy and water, a crucial adaptation for life in a dry habitat like the savannahs of northern Ghana. Example 2 (Plant): The Baobab Tree's Trunk. The baobab tree has a very thick, swollen trunk that is used to store large amounts of water, allowing it to survive long dry seasons. Behavioural Adaptations: These are the actions or things an organism *does* to survive. They are about behaviour, not physical body parts. Example 1 (Animal): The Agama Lizard Basking. You often see Agama lizards lying still in the sun ("basking"). This is a behaviour to absorb heat from the sun to warm up their bodies, as they are cold-blooded. When it gets too hot, they move into the shade – another behavioural adaptation to avoid overheating. Example 2 (Animal): Nocturnal Activity. Many animals in the hot savannah, like the African civet (*ɔkra* in Twi), are nocturnal. They are active at night when it is cooler, which helps them conserve water and energy. This is a behavioural adaptation. Physiological Adaptations: These are internal body processes or chemical reactions that help an organism survive. You cannot see these adaptations just by looking at the organism. Example 1 (Animal): Venom Production in Snakes. A puff adder produces venom. This is a complex chemical substance made inside its body. It is a physiological adaptation used for both defence against predators and for capturing and digesting prey. Example 2 (Plant): Making Nectar. Flowers produce nectar, a sugary liquid, deep inside them. This is a physiological process. The nectar attracts insects and birds, which then help the plant to pollinate.

2.3 Adaptations in Major Ghanaian Habitats

Let's explore some common organisms in Ghana and their specific adaptations.

Evaluation guide

• Describe how common tropical organisms are adapted to their habitats .
• Project- Based Learning: embark on an ecological trip to observe and identify specific organisms
• that occupy peculiar habitats: t his offers learners to learn academic lessons from different cultures and
• environments, giving them rich socio -emotional lessons to accept learners from diverse cultural, social