SS 1 Biology (1st, 2nd & 3rd Term)

ECOLOGICAL MANAGEMENT

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

FUNCTIONING ECOSYSTEM

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

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

Biomes are large natural terrestrial ecosystem, 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

BASIC ECOLOGICAL CONCEPTS

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

NUTRITION IN ANIMALS

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 / CELL REACTIONS TO ITS ENVIRONMENT

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 UNICELLULAR ORGANISMS AND INVERTEBRATES

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

SEXUAL REPRODUCTION

There are two types of sexual reproduction, this include 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

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

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

BASIC ECOLOGICAL CONCEPT

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

MODE OF NUTRITION

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

ANIMAL NUTRITION

ANIMAL NUTRITION (FOOD SUBSTANCES) Food is a complex energy-rich organic matter which living organism feed on to obtain nutrients and substances necessary for life. Food substances are classified to six… Read More »ANIMAL NUTRITION

NUTRIENT CYCLING IN NATURE

Nutrient cycle is defined as the circulation of certain nutrient such as carbon, sulphur and water in nature Carbon Cycle The carbon cycle is the way carbon (iv) oxide is… Read More »NUTRIENT CYCLING IN NATURE

PLANT NUTRITION

Nutrition is defined as the process by which living organisms obtain and utilize food material from external environment for metabolic activities such as respiration, growth, excretion and reproduction. Photosynthetic or… Read More »PLANT NUTRITION

Organization of Life

Organization of life is defined as the existence of life from a single called organisms to a multicellular organisms with complex form that perform different functions Levels of Organization 1 … Read More »Organization of Life

CHARACTERISTICS OF LIVING THINGS

Classification is defined as the arrangement of living things into groups based on structural genetic and cellular organization. This is called TAXANOMY.The system of classification of living things used today… Read More »CHARACTERISTICS OF LIVING THINGS

LIVING THINGS AND NON-LIVING THINGS

Living things are those objects that have life e.g. plant and animals. Non-living things are those objects without life or lifeless objects. CHARACTERISTICS OF LIVING THINGS MOVEMENT: is… Read More »LIVING THINGS AND NON-LIVING THINGS

BIOLOGY AND INQUIRY

Science is defined as a systematic process of making enquiry about the living things and non-living things in our environment. The term Biology is coined from two Greek work bios… Read More »BIOLOGY AND INQUIRY

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