Lesson Notes By Weeks and Term - Senior Secondary 2

TERM – 1^ST TERM

WEEK TEN

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Biology

Topic: ECOLOGICAL MANAGEMENT: ADAPTATION

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Define adaptation
2. Identify various types of Association

iii. Identify features of biological importance possessed by organisms to an association

1. Discuss the effects of availability of water on adaptive modification.
2. Discuss at least the structural adaptation of a fish and a tadpole in water.

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION	TEACHER’S ACTIVITY	STUDENT’S ACTIVITY
STEP 1 INTRODUCTION	The teacher introduces adaptation and identify various types of Associations.	Students pay attention
STEP 2 EXPLANATION	Teacher explain the features of biological importance possessed by organisms	Students pay attention and participate
STEP 3 DEMONSTRATIO N	Teacher uses diagrams to explain the structural adaptation of a fish, tadpole and bird.	Students pay attention and participate
STEP 4 NOTE TAKING	The teacher writes a summarized note on the board	The students copy the note in their books

 

NOTE

ECOLOGICAL MANAGEMENT 2

Adaptation

Adaptation refers to the evolutionary process by which a population of organisms becomes better suited to its environment over successive generations. This process involves the development or modification of traits that increase an organism's chances of survival and reproduction in a particular habitat. Adaptations can occur at the genetic, anatomical, physiological, or behavioral levels and are driven by natural selection, where individuals with advantageous traits are more likely to pass on their genes to the next generation.

Types of Association

Associations between different species in ecosystems can take various forms, and some common types include:

1. Symbiosis: Symbiosis is a close and long-term interaction between two different species. It can be beneficial, harmful, or neutral. Examples of symbiosis include,

     - Parasitism: One species benefits at the expense of the other.

     - Commensalism: One species benefits, and the other is neither helped nor harmed.

2. Mutualism: Mutualism is a type of symbiosis in which both species involved benefit from the interaction. For example, the relationship between bees and flowers, where bees obtain nectar for food while aiding in pollination, benefits both species.
3. Parasitism: Parasitism is a type of symbiosis in which one organism (parasite) benefits at the expense of another (host), usually causing harm to the host. For example, the relationship between ticks and mammals, where ticks feed on the blood of the host, benefiting themselves but potentially harming the host.
4. Commensalism: It is a type of symbiosis in which one species benefits from the association, while the other is neither helped nor harmed. For example, Barnacles attaching themselves to whales for transportation. The barnacles benefit by getting a free ride, while the whale is generally unaffected.

Features of biological importance possessed by organisms to an association

Organisms in associations often exhibit various features of biological importance, such as:

1. Symbiotic Relationships: Organisms may form symbiotic relationships for mutual benefit, where both partners gain advantages, like in mutualism, commensalism, or parasitism.
2. Cooperation: Collaborative behaviors, like division of labor or coordinated activities, enhance the efficiency and success of the association.
3. Communication: Effective communication mechanisms, including chemical signals, sounds, or visual cues, enable organisms to interact and coordinate within the association.
4. Adaptations: Species within associations may evolve specific adaptations to thrive in the shared environment or to complement each other's ecological niches.
5. Defensive Strategies: Collaborative defense mechanisms, such as group protection or warning signals, enhance the survival chances of individuals within the association.

Effects of availability of water on adaptive modification

The availability of water plays a pivotal role in shaping adaptive modifications in different organisms. In arid environments with limited water resources, species often develop traits that enhance water conservation and efficiency. This may involve adaptations such as reduced water loss through specialized skin or cuticles, modified metabolic processes, and efficient water storage mechanisms.

Conversely, in aquatic or water-rich environments, organisms may undergo adaptive modifications geared towards thriving in such conditions. Examples include streamlined body shapes for efficient swimming, specialized gills for extracting oxygen from water, and behaviors related to reproduction and survival in aquatic ecosystems.

Structural Adaptation of a tadpole

Tadpoles undergo several structural adaptations to facilitate their aquatic lifestyle before transforming into adult frogs. Some key structural adaptations include:

1. Tail: Tadpoles have a long, muscular tail that aids in swimming. This tail is later reabsorbed or transformed during metamorphosis into the legs of the adult frog.
2. Body Shape: Tadpoles typically have a streamlined body shape, which enhances their swimming efficiency in water.
3. Gills: Tadpoles possess external gills for breathing underwater. As they mature, these gills are often replaced by internal gills or lungs during metamorphosis to accommodate the shift to terrestrial life.
4. Mouthparts: Tadpoles have specialized mouthparts for feeding on aquatic vegetation and microorganisms. As they transform into adult frogs, their mouthparts change to suit their carnivorous diet.
5. Lateral Line System: Some tadpoles have a lateral line system, which is a series of sensory organs along the sides of their bodies. This system helps them detect changes in water pressure and vibrations, aiding in navigation and predator avoidance.

Structural Adaptation of a fish

Fish have various structural adaptations that enable them to thrive in aquatic environments. Examples include streamlined bodies for reduced water resistance, fins for navigation and stability, gills for efficient oxygen extraction, scales for protection, and a swim bladder for buoyancy control.

Structural Adaptation in birds

Birds exhibit several structural adaptations that contribute to their success in the aerial environment. These include lightweight skeletons to reduce overall body weight, strong and lightweight feathers for flight, a keel on the breastbone for muscle attachment to power wing movement, a beak suited to their feeding habits, and a highly efficient respiratory system with air sacs for continuous airflow. These adaptations collectively support their ability to fly and thrive in diverse habitats.

EVALUATION: 1. What is adaptation

2. Identify and explain briefly the types of Association.
3. Mention 3 features of biological importance possessed by organisms

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively.