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Chapter 7- Structural Organisation in Animals Interview Questions Answers

Question 1 :
Answer in one word or one line.
(i) Give the common name of Periplanata americana.
(II) How many spermathecae are found in earthworm ?
(iii) What is the position of ovaries in cockroach ?
(iv) How many segments are present in the abdomen of cockroach ?
(v) Where do you find malpighian tubules?

Answer 1 :

(i) Cockroach
(ii) Four pairs of spermathecae are found in the 6“ to 9th segments (one pair in each segments).
(iii) Cockroach includes a pair of ovaries, that lie laterally in the 2nd to 6th abdominal segments of abdomen.
(iv) Ten
(v) At the junction of midgut and hindgut. 100-150 yellow coloured thin filamentous ring is present in earthworm, which is called malpighian tubules.

Question 2 :
Answer the following :
(i) What is the function of nephridia ?
(ii) How many types of nephridia are found in earthworm based on their location?

Answer 2 :

(i) Nephridia are the minute openings found in all segments excepts the first two and their function is to discharge of nitrogenous waste.
(ii) There are three types of nephridia –
(i) Septal nephridia – Present on both the sides of intersegmental septa of segment 15 to the last that open into intestine.
(ii) Integumentary nephridia – Attached to the lining of the body wall of segment 3 to the last that open on the body surface.
(iii) Pharyngeal nephridia – Present as three paired tufts in the 4th, 5th and 6th segments.
These three different types of nephridia are almost similar in structure.

Question 3 :
Draw a labelled diagram of the reproductive organs of an earthworm.

Answer 3 :

Question 4 :
Draw a labelled diagram of alimentary canal of a cockroach

Answer 4 :

Question 5 :
Distinguish between the following:
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium

Answer 5 :

a) Prostomium andperistomium



Small, fleshy lobe, serves as a covering for the mouth and as a wedge to force open cracks in the soil wherein the earthworm crawls.

It is the crescentic aperture at the anterior end of the first segment of the earthworm comprising the mouth


b) Septal nephridiumand pharyngeal nephridium