Introduction to the Study
Chapter One is composed of six parts : (1) Background of the study, (2) Theoretical Framework, (3) Statement of the Problem and Hypothesis, (4) Significance of the Study, (5) Delimitation of the Study, and (6) Definition of Terms.
Part One, Background of the study, justifies the need for conducting the study and discusses the choice for the problem. Part Two, Theoretical Framework, presents the related studies from where the present investigation was based.
Part Two, Statement of the Problem and Hypothesis, includes the general objective of the study, the specific question which the study seeks to answer and the hypotheses to be tested.
Part Three, Significance of the Study, discusses the importance of the study, specifies the benefits that may be derived from the results and the persons, groups and sector that would benefit the research.
Part Four, Delimitation of the Study, indicates the limits, coverage, and boundaries of the study and discusses the issues of the research in relation with the time frame.
Part Five, Definition of Terms provides the conceptual and operational definition of some important term as they are used in the study.
Background of the Study
Our society is surrounded by many types of diseases and illness that spreads out and infect people. The fast spread of diseases carrying mosquitoes is one of the major problems in the community. In line with this basic problem, numerous researchers have been conducted regarding the use of insecticides from commonly grown plants in the Philippines. Mosquito, is a common name for about 2000 species of two-winged insects. They are found from the tropics to the Arctic Circle from low lands to the peaks of high mountains. Mosquitoes have long slender wings and are unusual among flies in having small scales in the most of the wing veins. The body is narrow. The long antennae have numerous whorls of hair, short in the female and long bushy in the male. In one large group of mosquitoes, the mouthparts of the female are long adapted for piercing and for sucking blood. The male, which feeds on nectar and water, has rudimentary mouthparts. Females of this group prefer the blood of warm-blooded animals, when they bite, they inject some of their salivary fluid into the wound, causing swelling and irritation. Many inject infectious microorganisms and thus transmit such diseases as malaria, yellow fever, dengue, and filariasis. Female mosquitoes lay their eggs only in water, some species lay their eggs in running water, others in woodlands pools, marshes, swamps, estuaries, or in containers such as rain barrels. The larvae are known as wrigglers because of their wriggling motion in the water. A large number of mosquito eggs and larvae are destroyed by small fishes. Mosquitoes may be controlled by eliminating their breeding places or by spraying these places by oil or insecticides.
The typical species is most abundant in warm regions. The common house mosquito of the United States is the carrier of encephalitis. Other species are responsible for the spread of yellow fever and dengue. Several species of a related group transmit malaria. This group is characterized by palpi, or sense organs, on the mouthparts that are as long as the sucking tube in both male and female. The wings of these mosquitoes are spotted with white and dark areas. These mosquitoes are rest with the head and sucking tube parallel to the surface on which they are resting and with the body bent at an angle to this surface, other mosquitoes, including the common house mosquito, rest with the body parallel and with the head at an angle to the surface(Science Today, 2011).
Other species, the Asian tiger mosquito, has caused health experts concern since it was first detected in the United States in 1985. Probably arriving in shipments is used tire casing, these fierce biter can spread a type of encephalitis, dengue fever, and other disease. Hardly and...