Cockroach

   Cockroaches are insects of the order Blattodea, which also includes termites. About 30 cockroach species out of 4,600 are associated with human habitats. The cockroaches are an ancient group, dating back at least as far as the Carboniferous period, some 320 million years ago.

  Some species, such as the gregarious German cockroach, have an elaborate social structure involving common shelter, social dependence, information transfer and kin recognition.

 A. Scientific Classification

Kindom           : Animalia

Phylum            : Arthropoda

Class               : Insecta

Superorder      : Dictyoptera

Order               : Blattodea

B. Cockroach Life Cycle

    1.      Egg Production

    The cockroach life cycle starts with the production of eggs. Adult females produce between 10 and 40 eggs at a time, which they carry in specialized cases called ootheca.Generally shaped like a kidney bean or purse, the egg case is either carried by the mother or placed in a protected location until hatching.After carrying the capsule around on her abdomen for a species-specific amount of time, the female deposits the egg capsule in a protected location preferably near a food source.

2. Nymph to Adult

         Newly hatched cockroaches emerge from eggs as nymphs.

       During the nymphal stage of the cockroach life cycle, the insects grow by shedding their skin multiple times until reaching adulthood, a process known as molting.

3.   After Molting

        A fter each molt, the developing cockroaches become soft-bodied and white before eventually getting larger, getting darker in color and hardening off.

      The rate at which cockroaches mature into fully developed adults depends on factors like species and the conditions of the surrounding environment.

       In favorable conditions, cockroach nymphs can reach adulthood in a matter of weeks.

C. cockroach superiority

1. Hold nuclear radiation

A recent study from Iowa University, USA, found that cockroaches are resistant to radiation up to 105,000rems (humans only resist when less than 800 reminds of radiation)

The cockroach cells divide only during the molting cycle, about once a week. So they are sensitive to radiation only about 48 hours, or 1/4 weeks. Humans have the blood and immune stem cells dividing constantly. With nuclear bomb radiation, all humans will die, but only 1/4 of the cockroaches will survive.

2.  Cockroaches are able to live without a head

Cockroaches are able to live without a head
Cockroaches do not need a head to survive. As a comparison, humans need a head for 3 functions, among others:
 
Breathing through the nose and mouth, and breathing is controlled by the brain.
The head loss causes the blood loss drastically.
We eat by mouth.
 
But for cockroaches:
 
They breathe through the ventilator throughout the physical and the brain does not control this function.
Insects do not have blood pressure as in mammals 
Eating cold-blooded animals, little food can last a full lifetime. Headless cockroaches can survive long enough.


Question


1. How much cockroach spesies out of 4,600 are associated with human habitats ?

a. 10

  b. 20

  c. 30

  d. 40

2. What class of the cockroach in the scientific calssification ?

  a. Mamals

  b. Insect

  c. Amfibi

  d. Pisces

3. What is the second stage of cockroach in life cycle ?

  a. Nymph

  b. Egg

  c. Cockroach

  e. there is no right answer

4. choose one of the advantages of cockroaches!

  a. it can fly

  b. there is no right answer

  c. it can't die

  d. able to live without head for a while

5. Some species, such as the ................... cockroach, have an elaborate social structure involving common shelter, social dependence, information transfer and kin recognition.

  a. gregarious German 

    b.  Eupolyphaga

     c. American cockroach

    d. Ectobius vittiventris