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GROWTH AND DEVELOPMENT

Biology

CHARACTERISTICS OF LIVING THINGS

CHARACTERISTICS OF LIVING THINGS Life defined through observations of activities carried out by living things;   Nutrition Nutrition is the processes by which food/nutrients are acquired/made and utilized by living organisms. Green plants and certain bacteria make their own food. All other organisms feed on complex organic materials.   Respiration This is the breakdown of food to provide energy. The energy released is used for various activities in the organism. Gaseous Exchange – Process throw which respiratory gases (CO2&O2) are taken in and out through a respiratory surface   Excretion Excretion is the removal of metabolic wastes from the body Substances like urea, carbon dioxide (Carbon (IV) oxide) These substances are poisonous if allowed to accumulate in the body   Growth and Development Growth means irreversible change in size All organisms increase in size that is, they grow Development is irreversible change in complexity As they do so, they also… Read More »CHARACTERISTICS OF LIVING THINGS

Biology

GROWTH AND DEVELOPMENT

GROWTH AND DEVELOPMENT Concept of Growth and Development Growth is a characteristic feature of all living organisms. Most multicellular organisms start life as a single cell and gradually grow into complex organisms with many cells. This involves multiplication of cells through the process of cell division. This quantitative permanent increase in size of an organism is referred to as growth. For growth to take place the following aspects occur   Cells of organisms assimilate nutrients hence increase in mass. Cell division (mitosis) that lead to increase in the number of cells. Cell expansion that leads to enlargement an increase in the volume and size of the organism. It is therefore possible to measure growth using such parameters as mass, volume, length, height, surface area.   On the other hand development is the qualitative aspect of growth which involves differentiation of cells and formation of various tissues in the body of… Read More »GROWTH AND DEVELOPMENT

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