Welcome great EduPodian, here is your Third Term SS1 Biology Lesson Note excerpt.
Scheme of Work
1. Micro-Organisms Around Us and the Concept of Culturing.
2. Micro-Organisms in Action.
3. Sexually Transmitted Infections (STI)
4. Towards BetterHealth
5. Relevance of Biology to Agriculture
6. Pests and Diseases of Plants.
7. Pests and Diseases of Animals.
8. Food Storage and Production.
REFERENCES
• Modern Biology for Senior Secondary Schools by S.T. Ramlingam
• Essential Biology by M.C Michael
• New Biology by H. Stone and Cozen
• SSCE, past questions and answers
• New System Biology by Lam and Kwan
• College Biology by IdodoUmeh
• UTME, SSCE and CAMBRIDGE past questions and answers
• Biology practical text
Week 1:
MICRO-ORGANISMS AROUND US
CONTENT
• Description and Groupsof Microorganisms
• Concept of Culturing
• Identification of Microorganisms
• Carriers of Microorganisms
DESCRIPTION AND GROUS OF MICROORGANISMS
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 to the upper atmosphere. They occur most abundantly where there is food, moisture and adequate temperature for their growth.
It was the invention of microscope that opened the gateway to the world of these minute living organisms. The first person to discover microbes was a Dutch man called Anthony Leeuwenhoek (1632-1723). Using a simple microscope, he was astonished to discover that rain water that had been collected from pools was full of little organisms.
GROUPS OF MICRO-ORGANISMS
Micro-organisms include all viruses, bacteria and the protists. Others are… Click here to order the complete Biology Lesson Note for SS1 third term
Week 2:
MICRO-ORGANISMS IN ACTION
CONTENT
• Growth of Microorganisms
• Beneficial and Harmful Effects of Microorganisms
• Diseases Caused by Microorganisms, Symptoms, Mode of Transmission and Control
GROWTH OF MICRO-ORGANISMS
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 different phases in the growth of bacteria. These include the (i) lag phase (ii) logarithmic or exponential phase (iii) the stationary phase and (iv) decline or death. The growth of micro-organisms can be measured by using any of these methods:
(a) Turbidity method.
(b) Serial dilution method.
(c) Squared transparent paper or cellophane method.
EVALUATION
1. State four factors that can affect the growth of microorganisms.
2. List three ways of measuring the growth of bacteria.
BENEFICIAL AND HARMFUL EFFECTS OF MICRO-ORGANISMS
BENEFICIAL EFFECTS
1. Bacteria help to digest cellulose in herbivores.
2. In man… Click here to order the complete third term Biology Lesson Note for SS1
Week 3:
SEXUALLY TRANSMITTED INFECTIONS
CONTENT
• Definition, Mode of Transmission, Symptoms, Prevention and Control
• HIV and AIDS
Sexually Transmitted Infections (STIs) (veneral diseases) are the diseases that are contacted through sexual intercourse. Examples include syphilis, gonorrhea, herpes, thrush, AIDS etc. The table below shows a list of STIs, their symptoms, transmission, etc… Click here to order the complete Lesson Note on Biology SS1 third term
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