Cockroach
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39 Terms
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salivary gland
The ________ present at its base helps to secrete enzymes to digest.
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Antennas
________ have sensory receptors which help in sensing the environment.
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Arolium
________ helps to walk on smooth surfaces.
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Sclerites
________ in the cockroach are covered through the thin membrane called the articular membrane.
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Phylum
Arthropoda
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Class
Insecta
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Order
Dictyota
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Chromosome number
34
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Size
34-53mm
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Head (6), Thorax (3), Abdomen (11)
20 segments in the embryonic stage
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Head (1), Thorax (3), Abdomen (10)
14 segments in adult
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The legs consist of 5 segments
[CTFTT]
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5th and 6th tergum
Stink gland (smell repels the enemies)
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10th tergum
Anal Cerci
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9th sternum
Anal style
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Crop
Helps in digestion of food.
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Gizzard
To crush and grind the food.
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Hepatic Caeca
It secretes digestive enzymes which helps in digestion
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Claws
It helps to walk on rough surfaces.
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Labrum
Upper lip
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Labium
Lower lip
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Mandible
Chitinous teeth present in it helps in grinding.
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Maxilla
To pick up the food.
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Hypopharynx
Tongue of cockroach.
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Leg has five segments
Coxa (broadest segment)
Trochanter (small segment)
Femur (long segment)
Tibia (longest segment)
Tarsus
Trochanter (small segment)
Femur (long segment)
Tibia (longest segment)
Tarsus
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fore wings/ elytra / tegmina
it is present on mesothorax. it is long, narrow, opaque, dark, and leathery.
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hind wings
it is present on the metathorax. it is small, broad, transparent, and membranous. these wings help in flight.
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anal cerci
main sound receptors present on the 10th tergum which is segmented (15 in no.).
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anal style
projected spine-like structures present on the 9th sternum. it is non-segmented and helps in copulation.
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tracheal system
the network of respiratory tubules in the body.
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tracheoles
the last branches of the trachea.
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inspiration
when the abdomen expands, atmospheric air gets filled in the tracheal system through spiracles called inspiration.
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expiration
when the abdomen contracts, the air is forced out called expiration.
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haemolymph
colorless plasma + blood corpuscles (haematocytes)
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heart of cockroach
dorsal, tubular, and 13-chambered
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malphigian tubule
100-150 in number and they serve as the main excretory organ.
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nephrocytes
it helps in initiation of heartbeat.
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uricose glands
these help in excretion in male cockroach only.
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apposition