• AGRICULTURAL ECOLOGY
    AGRICULTURAL SCIENCE

    AGRICULTURAL ECOLOGY

    Agricultural ecology can simply be defined as the study of crop plants and farm animals in relation to their environment. Ecology is derived from a Greek word Oikos which means home or dwelling place. In other words, agricultural ecology can be defined as a field of study which deals with the relationship of living organisms with one another and with the environment in which they live. Agricultural ecology is divided into two main branches: Autecology: Autecology is concerned with the study of an individual organism, or a single species of organism and its environment for example, the study of a single cattle and its environment. Synecology: Synecology is concerned with…

  • NUTRITION
    BIOLOGY

    NUTRITION

    Nutrition is the process by which food is taken in by living organisms in order to supply the nutrients required for the continuous metabolic reactions going on in the body. Food is the source of nutrients.   Usefulness of Food Living cells or organisms require food for various reasons. These reasons are: To provide energy needed for various physical and metabolic activities. To make essential substances such as hormones and enzymes. To make new cells for growth and replacement of worn-out tissues. To supply various substances required for healthy growth and development.   Types of Nutrition There are two major types of nutrition. These are autotrophic and heterotrophic nutrition.  …

  • CELL AS A LIVING UNIT OF AN ORGANISM
    BIOLOGY

    CELL AS A LIVING UNIT OF AN ORGANISM

    The cell is defined as the structural and functional unit of a living organism. In other words, the cell is the simplest, the smallest and basic unit of life. All living things (plants and animals) are made of cells. The cell is regarded as the basic unit of all living things because it can carry out all life activities such as feeding, reproduction, excretion, growth, adaptation, respiration, definite life span, sensitivity and movement. All these activities possessed by a cell are the characteristics of living things.   Classification of Living Organisms Based on the Number of Cells Living organisms are classified into two major groups based on the number of…

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