This set of Class 11 Biology Chapter 7 Multiple Choice Questions & Answers (MCQs) focuses on “Structural Organisation in Animals – Cockroach-2”.
1. What structure of the cockroach is called the tegmina?
a) Hindwings
b) Thorax
c) Tongue
d) Forewings
View Answer
Explanation: The forewings of the cockroach is called tegmina. It is dark, opaque and leathery. The tegmina covers the hindwings. Out of the two pairs of wings, the cockroach uses the hindwings for flight.
2. Which of these is characteristic of hindwings of a cockroach?
a) Thick, Smooth
b) Opaque, Leathery
c) Membranous, Transparent
d) Moist, Thick
View Answer
Explanation: The hindwings of the cockroach are located below the forewings. The hindwings are membranous and transparent. They are used for the purpose of flight. The forewings are opaque and leathery.
3. How many segments is the abdomen of a cockroach divided into?
a) 3
b) 6
c) 10
d) 2
View Answer
Explanation: The abdomen of the cockroach is located after the head and thorax. It is divided into 10 segments. Overall, the body of the cockroach is divided into three parts – a triangular head, a thorax and an abdomen.
4. What is the shape of the seventh sternum of the female cockroach?
a) Boat – shaped
b) Triangular
c) Oval
d) Irregular
View Answer
Explanation: The abdomen of the cockroach is divided into 10 segments. The seventh sternum or segment is boat shaped. It is a part of the brood or genital pouch along with the eighth and ninth segments.
5. Which of these pairs of abdominal segments are a part of brood pouch of female cockroach?
a) 1st, 2nd
b) 8th, 9th
c) 3rd, 4th
d) 11th, 12th
View Answer
Explanation: The 8th and 9th segments of the abdomen of the female cockroach are a part of the brood pouch or the genital pouch. The genital pouch is made of the 8th, 9th and boat – shaped 7th segments.
6. Where are spermathecal pores located in cockroach?
a) Maxilla
b) Gonapophysis
c) Brood pouch
d) Anal cerci
View Answer
Explanation: The brood pouch or the genital pouch contains the spermathecal pores. The brood pouch also contains the female gonopore and the collateral glands. The 7th, 8th and 9th segments of the abdomen make up the brood pouch.
7. Which of these structures is dorsal in male cockroach?
a) Anus
b) Male genital pore
c) Gonapophysis
d) Foreleg
View Answer
Explanation: The anus is located dorsally on the body of the male cockroach. It is used for excretion. The male genital pore, the gonapophysis and the forelegs of the male cockroach is located on its ventral side.
8. Which of these structures is present in male cockroaches only?
a) Tegmina
b) Genital pouch
c) Anal cerci
d) Anal style
View Answer
Explanation: Both male and female cockroaches have tegmina or forewing, genital pouch and anal cerci. Anal style is present only in male cockroaches. They possess one pair of thin and thread-like anal cerci.
9. In which abdominal segment are the anal cerci present in cockroach?
a) 8th
b) 6th
c) 10th
d) 7th
View Answer
Explanation: The anal cerci are present in the 10th abdominal segment in both male and female cockroaches. Cockroaches possess one pair of anal cerci. The anal cerci are jointed filamentous structures.
10. Crop in cockroach is used to grind the ingested food. True or false?
a) True
b) False
View Answer
Explanation: False, as crop is used for the storage of food. It is a sac like structure that is located after the esophagus. The gizzard is located after the crop. Its function is the mechanical breakdown of food by grinding.
11. Which of these completes the pathway of ingested food in cockroach?
a) Pharynx
b) Salivary reservoir
c) Ileum
d) Crop
View Answer
Explanation: The crop is located between the esophagus and the gizzard. It is a sac like structure which is used for the purpose of food storage. The ileum is a part of the intestine, while the pharynx and salivary reservoir are located before the crop.
12. Which body system is the proventriculus of cockroach a part of?
a) Nervous system
b) Circulatory system
c) Digestive system
d) Reproductive system
View Answer
Explanation: The proventriculus of cockroach is also known as gizzard. It is a part of the digestive system of cockroach. The function of the gizzard is to mechanically break down food by the process of grinding.
13. The teeth of the gizzard in cockroach is composed of ______
a) calcium
b) cellulose
c) chitin
d) cellobiose
View Answer
Explanation: The teeth of the gizzard or proventriculus is made of chitin. The function of the gizzard in cockroach is to mechanically break down the ingested food by the process of grinding. The teeth help in grinding.
14. Which of these is not true about hepatic caeca in cockroach?
a) It lies below the gastric caeca
b) It secretes digestive juices
c) It is composed of blind tubules
d) It is located between the foregut and midgut
View Answer
Explanation: The hepatic caeca is a ring of 6 to 8 blind tubules. It is located between the foregut and midgut. It secretes digested juices. However, it is not located below the gastric caeca but is also known as gastric caeca.
15. Where are the Malpighian tubules present in cockroach?
a) Before foregut
b) Between midgut and hindgut
c) Between foregut and midgut
d) After hindgut
View Answer
Explanation: The Malpighian tubules of cockroach are present between the midgut and hindgut. They are 100-150 in number and are arranged in a ring. The Malpighian tubules are yellow, thin and filamentous.
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