In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on [2024]
5th segment
10th segment
8th and 9th segment
11th segment
(2)
In both sexes of cockroach, the 10th segment bears a pair of jointed filamentous structures called anal cerci.
Match List I with List II related to the digestive system of cockroach. [2024]
| List I | List II |
| A. The structures used for storing food. | I. Gizzard |
| B. Ring of 6–8 blind tubules at junction of foregut and midgut. | II. Gastric caeca |
| C. Ring of 100–150 yellow-colored thin filaments at junction of midgut and hindgut. | III. Malpighian tubules |
| D. The structures used for grinding the food. | IV. Crop |
Choose the correct answer from the options given below:
A-IV, B-II, C-III, D-I
A-I, B-II, C-III, D-IV
A-IV, B-III, C-II, D-I
A-III, B-II, C-IV, D-I
Given below are two statements. [2023]
Statement I: In cockroach, the forewings are transparent and prothoracic in origin.
Statement II: In cockroach, the hind wings are opaque, leathery, and mesothoracic in origin.
In the light of the above statements, choose the correct answer from the options given below.
Statement I is correct but Statement II is false.
Statement I is incorrect but Statement II is true.
Both Statement I and Statement II are true.
Both Statement I and Statement II are false.
(4)
In cockroach, forewings (mesothoracic) called tegmina are opaque, dark and leathery and cover the hind wings when at rest while the hind wings are transparent, membranous and are used in flight.
The cockroach is [2023]
Ammonotelic only
Uricotelic only
Ureotelic only
Ureotelic and Uricotelic
(2)
Cockroach is uricotelic. They absorb nitrogenous waste products and convert them into uric acid, which is excreted out through the hindgut.
Match List I with List II. [2023]
| List I | List II |
| A. Taenia | I. Nephridia |
| B. Paramecium | II. Contractile vacuole |
| C. Periplaneta | III. Flame cells |
| D. Pheretima | IV. Urecose gland |
Choose the correct answer from the options given below:
A-III, B-II, C-IV, D-I
A-II, B-I, C-IV, D-III
A-I, B-II, C-III, D-IV
A-I, B-II, C-IV, D-III
(1)
Taenia → Flame cells
Paramecium → Contractile vacuole
Periplaneta → Urecose gland
Pheretima → Nephridia
Which of the following is a characteristic feature of cockroach regarding sexual dimorphism? [2023]
Presence of sclerites
Presence of anal cerci
Dark brown body colour and anal cerci
Presence of anal styles
(4)
Cockroach shows sexual dimorphism, i.e., the sex can be distinguished from each other externally. Male cockroach bears a pair of short, thread-like anal styles which are absent in females. Dark brown body colour, anal cerci and sclerites are present in both male and female cockroaches.
In cockroach, excretion is brought about by [2023]
A. Phallic gland
B. Urecose gland
C. Nephrocytes
D. Fat body
E. Collateral glands
Choose the correct answer from the options given below:
B, C and D only
B and D only
A and E only
A, B and E only
(1)
In cockroach, excretion is performed by Malpighian tubules. Along with this, fat body, nephrocytes and urecose glands also help in excretion.
Tegmina in cockroach arises from [2022]
Prothorax
Mesothorax
Metathorax
Prothorax and Mesothorax
(2)
In cockroach, the first pair of wings, called tegmina (forewings), arises from the mesothorax.
Which of the following characteristics is incorrect with respect to cockroach? [2021]
10th abdominal segment in both sexes bears a pair of anal cerci.
A ring of gastric caeca is present at the junction of midgut and hindgut.
Hypopharynx lies within the cavity enclosed by the mouth parts.
In females, 7th–9th sterna together form a genital pouch.
(2)
In cockroach, a ring of 6–8 blind tubules called hepatic or gastric caeca is present at the junction of the foregut and midgut.
If the head of a cockroach is removed, it may live for a few days because [2020]
The supra-oesophageal ganglia of the cockroach are situated in the ventral part of the abdomen.
The cockroach does not have a nervous system.
The head holds a small proportion of a nervous system, while the rest is situated along the ventral part of its body.
The head holds 1/3rd of a nervous system, while the rest is situated along the dorsal part of its body.
(3)
The head holds a bit of a nervous system of the cockroach, while the rest is situated along the ventral (belly-side) part of its body. So, if the head of a cockroach is cut off, it will still live for as long as one week.
