What is the role of cerci in a cockroach?
They eat injured and dead cockroaches, too. On the end of the abdomen, there are a pair of cerci, projections which are sensory organs. Cerci function in a similar manner to antennae, sensing vibrations through air or ground.
Which statement regarding anal cerci and anal style in cockroach are correct?
Correct Answer : D. In cockroaches, males bear a pair of short, thread like anal styles which are absent in females. In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci.
Why do cockroaches hiss?
Insects in general have openings on the side of their bodies called spiracles. These lead to air ducts and are essentially how insects breathe. Hissing cockroaches have specially modified spiracles. If they expel air from them quickly, it produces the hissing noise.
What is main difference between male and female cockroach?
Complete answer:
| Male Cockroach | Female Cockroach |
|---|---|
| The male cockroaches’ antennae are smaller than the females’. | The antennae are relatively bigger than males’. |
| There are Anal styles. | There are no anal styles. |
| The male cockroach abdomen is slender. | The female cockroach’s abdomen is shaped like a boat and is blunt. |
What is the difference between anal cerci and anal style?
Hint: The anal styles (male copulatory organs) are only present in the male cockroaches. The anal cerci are sensory organ, which are wind sensitive. In cockroaches, exoskeleton is made up of chitin.
What are caudal styles in cockroach?
Anal styles are also known as caudal styles. The anal styles are present at the 9th sternites. Anal styles are found in male cockroaches only. These are essential for motion detectors in males.
How long is a cockroach pregnant?
28 days
The average gestation period for a German cockroach is 28 days. Brown-banded cockroach: Brown-banded cockroaches carry about 16 eggs per ootheca. The female cockroach will keep the ootheca with her for about a day or two and then adhere the egg case to a piece of furniture, wall, cardboard or another rough surface.
Can male cockroaches lay eggs?
As with many animals, cockroach reproduction relies on eggs from a female and sperm from a male. Most roaches are oviparous — their young grow in eggs outside of the mother’s body. In these species, the mother roach carries her eggs around in a sac called an ootheca, which is attached to her abdomen.
Which organ is present both in male and female cockroach?
There is only a pair of anal cerci is present in of female cockroach. The sternum of mesothorax is not bifurcated in male cockroaches. The sternum of mesothorax is bifid in the female cockroach’s body.
How can you tell if a roach is male or female?
Males and females have a pair of slender, jointed cerci at the tip of the abdomen. The male cockroaches have cerci with 18 to 19 segments while the females’ cerci have 13 to 14 segments. The male American cockroaches have a pair of styli between the cerci while the females do not.
How many Spermathecae are present in female cockroach?
So, the correct answer is ‘6th abdominal segment of female’.
Which gland is present in female cockroach?
colleterial glands
The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca.
Which cockroach has anal cerci?
– In male cockroach, a short, thread-like anal styles are present. – In both male and female cockroach, a jointed filamentous anal cerci is present. – Male cockroaches are smaller in size as compared to female cockroaches. – The wings of male cockroach are larger in size as compared to a female cockroach.
As with many animals, cockroach reproduction relies on eggs from a female and sperm from a male. Others continue to carry the hatching eggs and care for their young after they are born. But regardless of how long the mother and her eggs stay together, the ootheca has to stay moist in order for the eggs to develop.
Can female cockroaches fly?
Most cockroach nymphs, across species, are wingless and cannot fly until they develop wings later in life. The Madagascar hissing cockroach has no wings, even as an adult, and the female Oriental cockroach has only underdeveloped wing pads. Both are unable to fly.
The average gestation period for a German cockroach is 28 days. Brown-banded cockroach: Brown-banded cockroaches carry about 16 eggs per ootheca. The female cockroach will keep the ootheca with her for about a day or two and then adhere the egg case to a piece of furniture, wall, cardboard or another rough surface.
Can a male cockroach get pregnant?
As with many animals, cockroach reproduction relies on eggs from a female and sperm from a male.
Why do cockroaches fly towards you?
Sometimes when they’re threatened, they’ll fly to escape– either from a predator or from a human who wants to kill them. If they take off and fly straight towards you, they’re usually just frightened and not in very good control of where they’re headed.
What is the function of cerci in a cockroach?
Anal cerci are important sense organs of the organism as they are wind sensitive and detect vibrations. Abdomen is broader in female than in male. In male in addition to cerci, the 9th sternum bears a short unjointed anal stylus, which are absent in females. Was this answer helpful?
Where are the genital pouches located in a cockroach?
The tegmina are dark and cover the hind wings, which are membranous, transparent and used in flight. The abdomen is made up of 10 segments. The 7 th, 8 th and 9 th sterna form a genital pouch in females. In males, the genital pouch is present at the hind end of the abdomen.
What kind of reproductive system does a cockroach have?
The reproductive system is well developed in both the male and female cockroaches. The male reproductive system has a pair of testes that lie on the lateral side in the 4th -6th abdominal segments. There is an accessory reproductive gland in the 6 th and 7 th abdominal segments that is mushroom shaped.
Where does the excretion take place in a cockroach?
The Malpighian tubules perform the excretion in a cockroach. There are glandular and ciliated cells that are present lining each tubule, which absorb the nitrogenous waste products.
Anal cerci are important sense organs of the organism as they are wind sensitive and detect vibrations. Abdomen is broader in female than in male. In male in addition to cerci, the 9th sternum bears a short unjointed anal stylus, which are absent in females. Was this answer helpful?
How does a cockroach respond to a tactile stimulus?
A cockroach will respond to a tactile or wind stimulus directed at the body by rapidly turning away from the stimulus and running. The escape response due to air currents on the anal cerci is well studied. The sensory cells, central nervous system component, and motor response during running has
What makes a cockroach run from an object?
Finally arising from the end of the abdomen, the pair of anal cerci are covered with wind-sensitive hairs. An object rapidly approaching the cockroach pushes before it an air wave that alerts the cockroach to run for its life. Tree of Life:Blattaria Behavior
What kind of organs do cerci have on both sexes?
Cerci are pincer-shaped. On both sexes, the cerci are multi-segmented. They are important sense organs of the organism as they are wind sensitive and detect vibrations. Was this answer helpful?
