Select the correct sequence of organs in the alimentary canal of cockroach starting from the mouth. [2019]
Pharynx → Oesophagus → Ileum → Crop → Gizzard → Colon → Rectum
Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum
Pharynx → Oesophagus → Gizzard → Crop → Ileum → Colon → Rectum
Pharynx → Oesophagus → Gizzard → Ileum → Crop → Colon → Rectum
Which of the following features is used to identify a male cockroach from a female cockroach? [2018]
Presence of a boat-shaped sternum on the 9th abdominal segment
Presence of caudal styles
Forewings with darker tegmina
Presence of anal cerci
(2)
Male cockroach bears a pair of short thread-like anal/caudal styles which are absent in females. They project backward from the sides of the 9th abdominal segment in male cockroaches.
In male cockroaches, sperms are stored in which part of the reproductive system? [2016]
Seminal vesicles
Mushroom glands
Testes
Vas deferens
(1)
Seminal vesicles are numerous small sacs present on ventral surface of anterior part of the ejaculatory duct which store sperms.
Which of the following features is not present in Periplaneta americana? [2016]
Exoskeleton composed of N-acetylglucosamine
Metamerically segmented body
Schizocoelom as body cavity
Indeterminate and radial cleavage during embryonic development
(4)
In insects, cleavage is superficial.
The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of [2015]
urea
calcium carbonate
ammonia
potassium urate
(4)
In cockroach, Malpighian tubules extract metabolic wastes like potassium and sodium urate, water and carbon dioxide from the blood. In the Malpighian tubules, bicarbonates of potassium and sodium, water and uric acid are formed. A large amount of water and bicarbonates of potassium and sodium are reabsorbed by the cells of Malpighian tubules and then transferred to the blood (haemolymph). Uric acid is carried to the alimentary canal of the insect and is finally passed out through the anus.
The terga, sterna, and pleura of the cockroach body are joined by [2015]
arthrodial membrane
cartilage
cementing glue
muscular tissue
(1)
Arthrodial membrane is a tough, flexible cuticle that joins the skeletal elements of cockroach and other arthropods. It connects the terga, pleura, and sterna of the cockroach body.
