biologia: science fair

valentina y paula

VERMONT SCHOOL MEDELLIN

SECUNDARY

STAGE 7A

SCIENCE FAIR

HOW EFFECTIVE ARE NATURAL MOSQUITO REPELLENTS?

TEACHER: JESUS CARBONO

STUDIENTS: PAULA CASTELLANOS Y VALENTINA MOLINA.

MEDELLIN

Hypothesis:

HOW EFFECTIVE ARE NATURAL MOSQUITO REPELLENTS?

Investigation:

The life cycle of the mosquitos

Theoretical background

1. Egg : Eggs are laid one at a time and they float on the surface of the water. In the case of Culex and Culiseta species, the eggs are stuck together in rafts of a hundred or more eggs.

2. Larva : The larva live in the water and come to the surface to breathe. They shed their skin four times growing larger after each molting.

3. Pupa: The pupal stage is a resting, non-feeding stage. This is the time the mosquito turns into an adult.

a. Adult: The newly emerged adult rests on the surface of the water for a short time to allow itself to dry and all its parts to harden. Also, the wings have to spread out and dry properly before it can fly.

Life cycle of moscitos

What are de material that the repelents contain?

The active ingredient in a mosquito repellent is primarily responsible for its usefulness. First they need to see that the repellent work and attack a mosquito .it need to work in all the environment ,and it can be toxic.it need sold as aerosols , pumps, lotions, and oils . All of this need to be in a certain level. primarily composed of water, surfactants, fatty alcohol, fragrance, and other emollients These products are generally less effective than aerosol forms because they do not allow the active ingredients to evaporate as easily. Aerosols are the most common form for mosquito repellents.

More experiments

Insects, especially mosquitos, pose a pesky problem. Not only are they annoying while swarming around your face, their resulting bites can be itchy and unsightly. Conduct an experiment for a science project, or just for fun, that tests different insect repellents. One of the hardest parts of this project will be trying to gather some volunteers who don't mind the possibility of getting bitten by insects, and finding a location with plenty of insects.

MATERIALS AND REACTIVES

Experiment # 1

Materials:

· One friend

· One repellent

· Two hand

· Mosquitos

· Two bags

Experiment #2

Materials:

· One friend

· One repellent

· Two hand

· Mosquitos

· Two bags

Experiment # 3

Materials:

· One friend

· One repellent

· Two hand

· Mosquitos

· Two bags

Experiment #4

Materials:

· One friend

· One repellent

· Two hand

· Mosquitos

· Two bags

PROCEDURE_:

First we recollect mosquitos in a bag then we have to find a friend and in the hand of this friend we put repellent #1 and in the other hand we put repellent #2 and we watch what repellent is more efficient, so the hand that is more chopped is because the repellent is not good.