Growth is the irreversible increase in dry mass, size and complexity of an organism brought about by the synthesis of new protoplasm.
For growth to be effective, building up of materials (anabolism) must exceed the rate of breaking down (catabolism).
Plants are referred to as autotrophs, i.e. being able to manufacture their food (Organic compound from inorganic materials such as water, carbon dioxide)
Autotrophs generally have two modes of nutrition which are chemosynthesis and photosynthesis (holophytic).
CELLULAR (INTERNAL/TISSUE) RESPIRATION
The oxidation of glucose in the cell to release energy is known as cellular respiration and it occurs in the mitochondria of all living cells. There are two types of cellular respiration i.e. aerobic and anaerobic respiration
Environment/Nature and State of Matter
Living cells are known to be surrounded by a watery environment. This may include:
Fresh/salt water in which the unicellular organisms live, Intercellular fluid that bath the bodies of cells of higher animals
The cell is the simplest, smallest, basic, structural and functional unit of life. The cell can carry out all life activities such as growth, respiration e. t. c.
Cells can exist in various forms which include
THE VERTEBRATES (PHYLUM CHORDATA)
All vertebrates have the following features:
a. A bilaterally symmetrical body which is divided into a head, trunk and a tail with a neck joining the head to the trunk in most vertebrates.
b. An internal skeleton (endoskeleton)
CLASSIFICATION OF LIVING ORGANISMS MODERN CLASSIFICATION OF LIVING ORGANISMS All organisms cannot be suitably classified as either plants or animals…
DIFFERENCES BETWEEN PLANTS AND ANIMALS All living organisms can be generally classified as plants or animals. However, plants can be…
Everything in nature can be classified into two groups: living and non -living things.
The living things can be distinguished from their nonliving counterparts through the following characteristics observable in all living things:
A microscope is an instrument used in magnifying and viewing organisms smaller than 0.1mm that is too tiny to be seen by the human eyes. A compound light microscope consists of the following parts:
• Revolving nose piece: it is used for selecting lens to be used and to be in line with the eye piece.
• Objective lenses (low, medium and high power): for magnification of object
• Eye piece lens or ocular: for viewing magnified object.
• Body tube: provides attachment to eyepiece, revolving nose piece, low-power, medium-power and high-power objective lens.