General Principles of Classification Classification is the science that puts organisms into distinct groups to make their study easy and systematic. Modern scientific classification is based on structure and functions. Organisms with similar anatomical and morphological characteristics are placed in one group while those with different structures are grouped separately. Modern studies in genetics and […]
TOPIC 1 : CLASSIFICATION II – Click to view TOPIC 2 : ECOLOGY – Click to view TOPIC 3 : REPRODUCTION IN PLANTS AND ANIMALS – Click to view TOPIC 4 : GROWTH AND DEVELOPMENT – Click to view
BIOLOGY FORM 3 NOTES Read Post »
PART I: EXCRETION Excretion is a process by which living organisms separate and eliminate waste products of metabolism from their bodies Metabolic wastes are toxic to cells if allowed to accumulate, and could also alter the normal conditions for cell function, killing the cells Secretion is the release of certain useful substances produced by cells,
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Definition: process by which food substances are chemically broken down in all living cells to release energy, carbon (IV) oxide and water or alcohol Tissue respiration takes place in mitochondria. These organelles occur in large numbers in cells of organs that require a lot of energy e.g. kidney cells, muscle cells, sperm cells Adaptations: mitochondria
Gaseous Exchange in Plants Gaseous exchange: process by which respiratory gases, O2 and CO2, are passed across the respiratory surface Concentration gradient existing btn the respiratory surface and the surrounding medium facilitates gaseous exchange The mechanism of exchange involves simple diffusion. Gaseous exchange is important because it promotes uptake of O2 for respiration and removal
Need for Transport carry required substances to body parts remove metabolic wastes from the body Lower organisms and simple multicellular organisms have small bodies that make them have a large surface area to volume ratio. Diffusion alone is enough to transport substances. Higher organisms have large bodies and thus smaller surface area to volume ratio.
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TOPIC 1 : TRANSPORT IN PLANTS AND ANIMALS – Click to view TOPIC 2 : GASEOUS EXCHANGE – Click to view TOPIC 3 : RESPIRATION – Click to view TOPIC 4 : EXCRETION AND HOMOESTASIS – Click to view
BIOLOGY FORM 2 NOTES Read Post »
Introduction Nutrition refers to the process by which living organisms obtain and assimilate (utilize) nutrients. It is one of the fundamental characteristics of living things. The nutrients obtained are useful to the living organisms in many ways: The nutrients are required for growth and development of the living organisms. The nutrients are required for energy
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TUESDAY: 6 December 2022. Morning paper. Time Allowed: 2 hours. Answer ALL questions by indicating the letter (A, B, C or D) that represents the correct answer. This paper is made up of fifty (50) Multiple Choice Questions. Each question is allocated two (2) marks. 1. Which of the following is the MOST important DNS
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MONDAY: 5 December 2022. Afternoon Paper. Time Allowed: 3 hours. Answer ALL questions. This paper has two sections. SECTION I has twenty (20) short response questions. Each question is allocated two (2) marks. SECTION II has three (3) practical questions of sixty (60) marks. Marks allocated to each question are shown at the end of
NETWORK SETUP DECEMBER 2022 PAST PAPER Read Post »
MONDAY: 5 December 2022. Morning Paper. Time Allowed: 3 hours. Answer ALL questions. This paper has two sections. SECTION I has twenty (20) short response questions. Each question is allocated two (2) marks. SECTION II has three (3) practical questions of sixty (60) marks. Marks allocated to each question are shown at the end of
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