Octopus
The octopus is a mollusk animal (soft-bodied animals) dri cephalopoda class (animal legs located in the head), Octopoda order with coral reefs in the Ocean as the main habitat. Octopus consists of 289 species that account for one-third of the total species of cephalopoda class.
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Octopoda
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The octopus is a mollusk animal (soft-bodied animals) dri cephalopoda class (animal legs located in the head), Octopoda order with coral reefs in the Ocean as the main habitat. Octopus consists of 289 species that account for one-third of the total species of cephalopoda class.
The octopus has 8 arms (not tentacles) with a vacuum in the
form of concave spheres on the arm used to move on the ocean floor and catch
the prey. An octopus, which is a muscular hydrostatic structure that is
composed entirely of layers of boneless muscle or outer skeletal bone. But
there are some octopus that only consists of muscle and boneless skeletal
inside. The octopus does not have a shell as a protector on the outside as does
nautilus and has no inner shell or bone like cuttlefish and squid. The beak is
the hardest part of the body of the octopus used as the jaw to kill the prey
and bite it into small parts.
The octopus is pale or white, but the color of the skin can
be changed according to the color and pattern of the surrounding environment
with the intention of camouflaging. The ability to change color is used octopus
to communicate or warn other octopus. Some octopus species can break their own
limbs (muscle) like lizards and some lizard species that decide the tail while
running away. The crawling octopus arm also serves as a diversion for the
prospective predator and is useful at the time of mating. Several species of
octopus have a fourth defense system in the form of imitating the form of
dangerous marine animals such as lepu and eels thanks to a flexible body
combined with the ability to change color
The male octopus reproduces by placing the spermatofora
pouch into the female octopus cavity using a special arm called hectocotylus.
The third right arm usually becomes hectocotylus in some species, the female
octopus is biased to keep the sperm alive until the egg matures. Once
fertilized, the female octopus can lay eggs up to about 200.00 eggs. The number
of octopus eggs may vary depending on each individual, familia, genus or
species.
the octopus has good eyesight. Octopus pupil are shaped like a
pit of a piggy bank so it is feared to suffer from an astigmatic deformity, but
it does not seem to be a problem for hunting octopuses with insufficient
illumination. The octopus eye "can" differentiate the polarization of
light but seems color-blind. The octopus arm suction tool is equipped with a
chemoreceptor so that the octopus can feel the object being touched. The
octopus arms are equipped with a chemoreceptor so the octopus can feel the
object touched.
Question :
1. How many species that Octopus has ?
A. 298
B. 276
C. 237
D. 289
E. 269
2. What is Octopus sub-class ?
A. Elasmobranchi
B. Malacostraca
C. Coleoidea
D. Teleostei
E. Insecta
3. How many arm that Octopus have ?
A. 7
B.8
C. 9
D. 5
E. 6
4. How many eggs that female Ocotopus can lay ?
A. 100.000
B. 200.000
C. 50.000
D. 5.000
E. 40.000
5. What is Octopus defense mechanism ?
A. Camouflage
B. Ink sac
C. Toxic gas
D. Fire breath
E. Answer A and B correct
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