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

(1) Role of government in agricultural production
Environmental factors required for food production
3Ways of improving crop production

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 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,

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

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

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

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, in water, air, soil, surface of objects, as well as on and within living organisms.  They are carried by air currents from the earth’s surface

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 critical resource or function that it cannot survive in the given environment without the other species is referred to as mutualism or symbiosis. Symbiosis is

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