Zoology · Class 11 Science
Ch 7Type Study of Periplaneta americana (Cockroach) — Class 11 Zoology, concept-first.
Periplaneta americana, the American cockroach, is studied as a representative of the phylum Arthropoda (class Insecta, order Blattodea) because it is large-bodied, easy to collect, hardy, and shows every hallmark arthropod feature clearly — a chitinous jointed exoskeleton, a segmented body organised into head, thorax a…
Key concepts
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External Morphology of Cockroach
Periplaneta americana, the American cockroach, is used as a type study for the phylum Arthropoda because its large, hardy, easily obtained body clearly displays every basic arthropod feature — a jointed chitinous exoskel…
Most relevant Q&A
- Why is Periplaneta americana selected as a type study to represent the phylum Arthropoda?Free
- Describe the external head structure of the cockroach with the help of a labelled diagram.Free
- Give the systematic position (classification) of the cockroach.Free
- Describe the structure of the abdomen of the cockroach with the help of a labelled diagram.Free
- Why is the cockroach called a cosmopolitan pest?Free
Chapter contents
The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.
Introduction
Periplaneta americana, the American cockroach, is studied as a representative of the phylum Arthropoda (class Insecta, order Blattodea) because it is large-bodied, easy to collect, hardy, and shows ev…
External Morphology
The head is small, triangular, and held bent downward and backward beneath the body so that the mouthparts point downward and backward rather than forward — this orientation is called a hypognathous h…
Digestive System
The cockroach is an omnivorous scavenger, and its digestive system is a straight, coiled tube — the alimentary canal — running from mouth to anus, differentiated into three principal regions of differ…
Circulatory System
Unlike vertebrates, the cockroach (like all insects) has an open type of circulatory system: the blood (haemolymph) is not confined within a closed network of vessels but bathes the internal organs di…
Respiratory (Tracheal) System
Cockroaches, like other insects, respire by means of a tracheal system — a network of air-filled tubes that carries atmospheric oxygen directly to every tissue and removes carbon dioxide, entirely byp…
Nervous System
The cockroach nervous system is built on the typical annelid/arthropod plan — a paired, ganglionated, ventral nerve cord, sometimes called a ladder-type nervous system because in the embryo it consist…
Sense Organs
The cockroach carries a pair of large, kidney-shaped (reniform) compound eyes, one on either side of the head, occupying much of its dorsolateral surface.
Reproductive Systems
80 QThe male cockroach possesses a pair of testes, each a delicate, pale, finely divided mass of sperm-forming follicles, lying laterally in the fourth to sixth abdominal segments, embedded in the fat bod…
+−Very Short Answer Questions57 questions
- Q1Why is Periplaneta americana selected as a type study to represent the phylum Arthropoda?Free
- Q2Give the systematic position (classification) of the cockroach.Free
- Q3Why is the cockroach called a cosmopolitan pest?Free
- Q4What type of head does the cockroach have? Define it.Preview
- Q5Name the parts of the head capsule of the cockroach.Preview
- Q6What is the function of the antennae in the cockroach?Preview
- Q7What is the function of the compound eyes in the cockroach?Preview
- Q8Are ocelli present in Periplaneta americana? What are they called?Preview
- Q9Name the mouthparts of the cockroach from outermost to innermost.Preview
- Q10What is the function of the labrum?Preview
- Q11What is the function of the mandibles?Preview
- Q12What is the function of the maxillae?Preview
- Q13What is the function of the labium?Preview
- Q14What is the hypopharynx and what is its function?Preview
- Q15Name the three segments of the thorax of the cockroach.Preview
- Q16What does the prothorax of the cockroach bear?Preview
- Q17What does the mesothorax of the cockroach bear?Preview
- Q18What does the metathorax of the cockroach bear?Preview
- Q19What is tripod locomotion in the cockroach?Preview
- Q20How many pairs of walking legs does the cockroach have and where are they attached?Preview
- Q21Name the segments of a walking leg of the cockroach.Preview
- Q22What are tegmina?Preview
- Q23What is the function of the tegmina?Preview
- Q24What is the function of the membranous hind wings?Preview
- Q25How many segments make up the abdomen of the adult cockroach?Preview
- Q26What are anal cerci and what is their function?Preview
- Q27What are anal styles and in which sex are they found?Preview
- Q28What is the cuticle (exoskeleton) of the cockroach made of?Preview
- Q29Name the three regions of the alimentary canal of the cockroach.Preview
- Q30What is the crop and what is its function?Preview
- Q31What is the gizzard (proventriculus)?Preview
- Q32What is the function of the cuticular teeth of the gizzard?Preview
- Q33What is the peritrophic membrane and what is its function?Preview
- Q34What are gastric caecae and what is their function?Preview
- Q35Name the parts of the hindgut of the cockroach.Preview
- Q36What is the function of the rectum?Preview
- Q37What is the function of the salivary glands?Preview
- Q38What is the salivary reservoir?Preview
- Q39What is haemocoel?Preview
- Q40What is haemolymph and what does it lack?Preview
- Q41What are haemocoelic (blood) sinuses?Preview
- Q42Name the chambers of the dorsal heart of the cockroach.Preview
- Q43What are ostia and what is their function?Preview
- Q44What are alary muscles and what is their function?Preview
- Q45What is the fat body and what is its function?Preview
- Q46What are spiracles? How many pairs are present in the cockroach?Preview
- Q47What are tracheae?Preview
- Q48What are tracheoles?Preview
- Q49Name the type of nerve cord found in the cockroach.Preview
- Q50What is the brain of the cockroach called and what does it comprise?Preview
- Q51Name the ganglia present in the ventral nerve cord of the cockroach.Preview
- Q52What is an ommatidium?Preview
- Q53Name the light-refracting parts of an ommatidium.Preview
- Q54What is the rhabdom?Preview
- Q55How many testes are present in the male cockroach and where are they located?Preview
- Q56What is the mushroom gland (utricular gland) and what is its function?Preview
- Q57What is the spermatheca and what is its function?Preview
+−Short Answer Questions15 questions
- Q1Describe the process of digestion and absorption of food in the cockroach.Free
- Q2Describe the composition and role of haemolymph in the cockroach.Free
- Q3Describe the structure and function of the heart of the cockroach.Free
- Q4Explain the mechanism of blood circulation in the cockroach.Preview
- Q5Describe the structure of the tracheal system in the cockroach.Preview
- Q6Describe the mechanism of respiration (ventilation) in the cockroach.Preview
- Q7Describe the structure of an ommatidium.Preview
- Q8Explain how an apposition (mosaic) image is formed in the compound eye of the cockroach.Preview
- Q9Describe the male reproductive system of the cockroach.Preview
- Q10Describe the female reproductive system of the cockroach.Preview
- Q11Differentiate between a male and a female cockroach (sexual dimorphism).Preview
- Q12Describe the mouthparts of the cockroach and their role in feeding.Preview
- Q13Describe the mechanism of tripod locomotion in the cockroach.Preview
- Q14Describe the structure and function of the salivary apparatus of the cockroach.Preview
- Q15Describe the structure of the alimentary canal of the cockroach.Preview
+−Essay Questions8 questions
- Q1Describe the external head structure of the cockroach with the help of a labelled diagram.Free
- Q2Describe the structure of the abdomen of the cockroach with the help of a labelled diagram.Free
- Q3Describe the digestive system of the cockroach with the help of a labelled diagram.Free
- Q4Describe the circulatory system of the cockroach with the help of a labelled diagram.Preview
- Q5Describe the respiratory system of the cockroach with the help of a labelled diagram.Preview
- Q6Describe the nervous system of the cockroach with the help of a labelled diagram.Preview
- Q7Describe the male reproductive system of the cockroach with the help of a labelled diagram.Preview
- Q8Describe the female reproductive system of the cockroach with the help of a labelled diagram.Preview
Sample & Board Papers
Sample papers and previous-year board questions for this subject.
+−Show 11 questionsHide questions11 questions
- Q1Describe the digestive system of cockroach with the help of a neat labelled diagram.Preview
- Q2Draw a neat labelled diagram of the mouthparts of cockroach.Preview
- Q3Describe the digestive system of cockroach with the help of a neat labelled diagram.Preview
- Q4Draw a neat and labelled diagram of Ommatidium.Preview
- Q5Describe the blood circulatory system of periplaneta in detail and draw a neat and labelled diagram of it.Preview
- Q6Draw a neat labelled diagram of the mouthparts of cockroach.Preview
- Q7Describe the respiratory system of cockroach with the help of neat and labelled diagrams.Preview
- Q8Draw a neat labeled diagram of the mouthparts of cockroach?Preview
- Q9Describe the blood circulatory system of Periplaneta in detail and draw a neat and labelled diagram of it?Preview
- Q10Draw a neat labelled diagram of mouthparts of a cockroach.Preview
- Q11Describe the blood circulatory system of Periplaneta in detail and draw a neat labelled diagram of it.Preview