Question

Given below are four statements (a - d) each with two blanks, regarding morphology and physiology of cockroach. Select the option which correctly fills up the blanks in any two statements.
(P) At the junction of (i) and midgut is present ring of 100-150 yellow coloured thin filamentous (ii)
(Q) (i) is a sac like structure, used for storing food. It is followed by (ii) which helps in grinding food.
(R) The respiratory system consists of a network of (i) , that open through 10 pairs of small holes called (ii) on lateral side of the body.
(S) In both sexes, the (i) segment bears a pair of jointed filamentous structures called (ii) .

• A. (P) (i) Foregut, (ii) Gastric caecae
  (S) (i) Tenth, (ii) Anal cerci
• B. (P) (i) Hindgut, (ii) Malpighian tubules
  (R) (i) Trachea, (ii) Spiracles
• C. (Q) (i) Gizzard, (ii) Crop
  (S) (i) Sixth, (ii) Anal style
• D. (Q) (i) Crop, (ii) G izzard
  (R) (i) Spiracles, (ii) Tracheoles

Answer 1

The correct option is A (P) (i) Foregut, (ii) Gastric caecae

(S) (i) Tenth, (ii) Anal cerci
A. (P) (i) Foregut, (ii) Gastric caecae

(S) (i) Tenth, (ii) Anal cerci

EXPLANATION: Alimentary canal of cockroach is divided into three parts and they are foregut, midgut and hindgut. Gastric caecae is present at the junction of foregut and midgut. It can secrete digestive juice. Tenth segment contains a filamentous structure is called anal cerci. It is present in both male and female cockroaches. Anal cerci are important sense organs of cockroaches as they can detect the vibration of things.