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

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 the world around us in rich detail. Key Facts About The Eyes: 1. Complex Anatomy: The human eye is a complex structure made up of several components that work together to capture and process visual information. These […]

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IMPORTANCE OF BIOLOGY TO AGRICULTURE

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 Agricultural classification Classification based on life cycle Classification based on size BOTANICAL CLASSIFICATION The concept of binomial nomenclature has it that plant kingdom can be subdivided into divisions, classes, orders,

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BETTER HEALTH: VECTORS, GOOD HEALTH & MICRO ORGANISMS

CONTROL OF HARMFUL MICRO-ORGANISMS 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 microorganisms in order to maintain good health include High and low temperature: Boiling or heating of food, pasteurization of milk, sterilization of medical instruments and

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SEXUALLY TRANSMITTED INFECTIONS (STI)

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 symptoms, transmission, etc.   DISEASE CAUSATIVE ORGANISM SYMPTOMS PREVENTION/CONTROL GONORRHOEA Bacterium (Neisseria gonorrhea) −     Burning sensation during urination in males −     A thick yellowish discharge

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MICRO ORGANISMS: GROWTH, DISEASES, BENEFITS & HARMFUL EFFECTS

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 is called generation time. This time varies from one organism to another. It strongly depends upon nutrient availability, temperature, gaseous requirement and pH. There are

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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 unit. All organisms fall into one of the three major groups of biotic community, namely: producers (autotrophs), consumer (heterotrophs) and decomposers The autotrophs provide food

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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 area at a particular time. Population density: – this is the number of a particular species per unit area or volume of the habitat. Therefore

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BIOMES

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 densely packed tall trees while grasses and few scattered shrubs are found in a savanna biome. Climatic factors determine the type of vegetation in a

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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 into two equal parts starting from the nucleus. This is followed by the division of the cytoplasm, after which two daughter amoebae are formed. In

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SEXUAL REPRODUCTION

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 some unicellular organisms e. g. paramecium, fungi e. g. rhizopus, algae e. g. spirogyra. Two similar organisms (conjugants) join together and exchange genetic material contained

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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 are two types of reproduction asexual reproduction sexual reproduction Asexual Reproduction: is the process whereby an organism produces an offspring by itself. I.e. only one

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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. The three processes involve in growth are Cell division:- is a process by which cell increases in number and is achieved by cell division called

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