Arthropods: Insects

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by 18CChiasson
Last updated 4 years ago

Discipline:
Science
Subject:
Biology
Grade:
9

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Arthropods: Insects

Arthropods: Insects

We all have bilateral symmetry!

Bees & Wasps

Termites

Butterflies & Moths

Beetles

Flies & Mosquitos

Dragonflies

Insects that undergo incomplete metamorphosis are called hemimetabolous. They have three life stages: egg, nymph (larva) and adult. After the egg hatches, the insect will develop into a wingless nymph. In many cases it looks like a miniature adult. Along with each shedding or moult, the insect gets gradually bigger and looks more and more like an adult. On a flying insect, wings will slowly strart appear. After the last moult the insect is fully adult, able to use its wings and reproduce. Some examples of insects that undergo incoplete metamorphosis includedragonflies, cockroaches, termites, grasshoppers, and stick-insects.

Incomplete Metamorphosis

Insects can help or harm us in many ways. Bees and wasps for example pollinate many plants and flowers which allows these plants to give us fruit.Termites and ants break down organic matter, helping to produce new soil for crops. Insects can also harm us by carrying disease, or stinging, or biting us. Mosquitos are a prime carrier for malaria which is a disease that kills thousands per year. Bee stings can also be a pain although not deathy in most cases. We also compete with insects for food. Insects have destroyed over 75% of crops in Africa. Many farmers worldwide use pesticides to protect their crops.

Our Impact!

Coelom & Segmentation--The Coelom in insects is a mesodermally lined body cavity, where embryo can form.- There is said to be 11 segments in insects thorax and abdominal combined. Each segment serves different purposes. The last segment is used for reproduction.

Molting- Takes place during the larva stage- Helps insect to grow-Insects shed their exoskeleton many times, and each time the next exoskeleton will be bigger in size-Molt 5-60 times in their lifespan- Required to reach adult stage

StructureAside from the basic anatomy listed in the defining characteristics, insects have a few key body parts that help them see, adapt, and survive.- Coupound Eyes: These special eyes contain thousands of facets. Facets are hexogonal areas that serve as lenses. This gives the insect many tiny pictures or mosaic vision. Insects also have 2-3 orielles which are eyes used to sense light.- Exoskeleton & Chitin: Insects have thier skeleton on the outside of their body which means its an exokeleton.. It helps to keep the structure of the insect and protect its organs. The exoskeleton is made up of a nitrogenous polysaccharide called Chitin which protects the insect from many acidic fluids and helps with water retention. -Joined Apendages: appendages are external parts of the body, for example limbs. In insects many appendages adapt to what they are needed for. A grasshoppers appendages are specialized for jumping while other insects' aren't.

Diet and Feeding HabitsInsects have different mouthparts. Some have mandibles which are used to handle bite, and chew. Others have mouthparts that are fused together in a sucking tube, such as a mosquito when it peirces the skin and sucks blood. Fruit flies actually lap their food. Some insects have specialized digestive enzymes that allow them to take advantage of some unusual food sources that other animals cant. Insects can be herbivores, although usually they are omnivores. There towards the bottom of the food chain because they mainly feed off of plants or other insects.

ReproductionThe female insects consist ovaries where they produce eggs like humans, when insects mate, the male sperm will enter here and fertilize the egg. Sometimes the eggs stay in the ovaries until mature but sometimes they're layed and hatched.

Complete Metamorphosis

Insects that undergo complete metamorphosis are called holometabolous. They have four life stages: egg, larva, pupa and adult. After the eg is laid and has been hatched it will enter the larva stage. During the larva satge the insect will moult then pupation occurs at the final moult. It is a stage where the insect isnt very active, but is making dramatic body changes. At the end of the pupa stage the insect will be an adult with wings and reproduction abilities. The adults and larvae, being different, do not compete for the same food sources and have different predators. Complete metamorphosis occurs in 85% of known insect species.

Works Cited

Defining Characteristics:- Has no bones, but has an exoskeleton instead made of chitin. This exoskeleton is strong enough to protect the insect.- Every insect has 3 body parts: The head, the throax, and the abdomen. They also have 6 legs and one or two pairs of wings.- An insect has a set of attenae which helps it detect its food.- Insects are cold-blooded, lay many eggs, and go through metamorphasis.


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