Welcome to SS 1 Biology Notes, where you can find detailed, curriculum-based content written to help students understand key biology concepts.
These notes follow the official WAEC and NECO syllabus, making them ideal for students preparing for internal and external examinations.
Topics covered include cells, classification of living organisms, ecology, tissues and supporting systems, and more.
Each lesson is structured for clarity and includes definitions, diagrams, and examples to aid retention and understanding.
This section is perfect for classroom use, personal study, or lesson planning for teachers.
Access comprehensive SS 1 Biology notes based on WAEC and NECO syllabus. Learn key biology topics with clear explanations for exam preparation.
The Eyes: Anatomy, Functions, Problems, Solutions, Symptoms or Signs, Care For Eyes The eyes are remarkable sensory organs that provide us with a sense of sight, allowing us to perceive… Read More »The Eyes: Anatomy, Functions, Problems, Solutions
A pest is an organism which harbors disease organism(s) or causes damage to other organism(s). There are crop and livestock (animals) pests.
CLASSIFICATION OF PLANTS Plants exists in various forms and types hence, the need for classification. Plants can be classified on the following bases BOTANICAL CLASSIFICATION The concept of binomial… Read More »Importance of Biology to Agriculture
Control of Harmful Micro-Organism The control of harmful microbes include removal, inhibition of growth or killing by physical agents/processes and chemical agents or antibiotics. Some common methods of controlling harmful… Read More »Better Health Vectors, Good Health & Micro Organisms
Sexually Transmitted Infections (STIs) (veneral diseases) are the diseases that are contacted through sexual intercourse. Examples include syphilis, gonorrhea, herpes, thrush, AIDSetc.The table below shows a list of STIs, their… Read More »Sexually Transmitted Infections (STI)
Bacteria reproduce by binary fission in which a single cell divides into two. This process is called asexual reproduction. The time interval required for the cell to divide into two… Read More »MICRO ORGANISMS: GROWTH, DISEASES, BENEFITS & HARMFUL EFFECTS
Micro-organisms otherwise called microbes or germs can be defined as living things which cannot be seen with unaided eye but by the use of microscopes. They exist almost everywhere,… Read More »MICRO-ORGANISMS
TYPES OF ASSOCIATIONS AND THEIR FEATURES SYMBIOSIS OR MUTUALISM (+ +) Definition: When both population benefit and at least one of them is so dependent upon the other for some… Read More »ECOLOGICAL MANAGEMENT
FEEDING RELATIONSHIPS Since all living organisms must obtain energy and nutrients from the environment in order to remain alive, they are into feeding relationships. This makes an ecosystem a functional… Read More »FUNCTIONING ECOSYSTEM
POPULATION CHARACTERISTICS These include population size, density, frequency, percentage cover and distribution. Population size: – this is the number of organisms of the same species living together in a given… Read More »POPULATION
Biomes are large natural terrestrial ecosystems, identified by their dominant vegetation. They are terrestrial because plants form the bulk of the community in any ecosystem e.g. a forest biome has… Read More »BIOMES
DEFINITION OF ECOLOGY Ecology is the study of plant and animals (as well as microorganism) in relation to their environment. As a practical science, ecological studies involve:- Studying the distribution… Read More »BASIC ECOLOGICAL CONCEPTS
ANIMAL NUTRITION Animals generally cannot manufacture their food. Rather, they depend directly or indirectly on plants for their food. Hence they are called heterotrophs. Based on their food types, animals… Read More »NUTRITION IN ANIMALS
IRRITABILITY AND TYPES OF RESPONSES Irritability is the ability of organisms to respond to stimuli. A stimulus is any change in external or internal environmental condition which can bring about… Read More »IRRITABILITY/CELL REACTIONS TO ITS ENVIRONMENT
REPRODUCTION IN AMOEBA Amoeba reproduces asexually by binary fission and multiple fission (sporulation) during adverse condition. In binary fission when an amoeba reaches full size, it stops moving and divides… Read More »REPRODUCTION IN UNICELLULAR ORGANISMS AND INVERTEBRATES
There are two types of sexual reproduction, this includes conjugation and fusion of gametes. Conjugation: the simplest form of sexual reproduction, as contrasted with asexual reproduction. This is observed in… Read More »SEXUAL REPRODUCTION
MEANING AND TYPES OF REPRODUCTION Reproduction is the ability of an organism to give rise to new individuals of the same species in order to ensure continuity of life. There… Read More »REPRODUCTION
Growth is defined as an irreversible increase in volume, size, and number of parts, length and weight of an organism It is an organic process which takes sometimes to accomplish.… Read More »GROWTH
Ecology This is the study of living organisms (plants and animals) in relation to their environment. Ecology is divided into two main branches. AUTECOLOGY– is the study of an individual… Read More »BASIC ECOLOGICAL CONCEPT
Autotrophic Nutrition This is the type of nutrition in which the organisms are able to manufacture their own food. Organisms which can manufacture or synthesize their own food are called… Read More »MODE OF NUTRITION