Select the correct statement from the ones given below with respect to Periplaneta americanaa)Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.b)Males bear a pair of short thread like anal styles.c)There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut.d)Grinding of food is carried out only by the mouth parts.Correct answer is option 'B'. Can you explain this answer?

Question

Answer

Examining the statements

a. the nervous system in non chordates like cockroach is ventral connected by longitudinal connective and ganglia, so given statement is false

c. Malphigian tubules are 100-150 fine thread like structures present between the midgut and hindgut of cockroach, so given statement is false

d. grinding food in cockroach is done by both the mouthpart known as mandible as well as the gizzard which is present after foregut, so given statement is false

b. anal styles are short caudal unjointed structures present only in 9th sternum of males of cockroach which also helps differentiate between male and female cockroaches, so the given statement is true.

Answer

In male cockroach, from the side of the 9^th sternum, there arises a paired, small unjoined outgrowths called anal styles. These structures are sensitive to touch. These are absent in female cockroach. Nervous system is located ventrally. There are 100-150 Malpighian tubules. Grinding of food is carried out by gizzard.

Answer

Correct Statement About Periplaneta americana
The correct answer is option 'B': Males bear a pair of short thread-like anal styles. Here's a detailed explanation:
1. Overview of Periplaneta americana
- Periplaneta americana, commonly known as the American cockroach, is a large insect belonging to the family Blattidae.
- It exhibits distinct sexual dimorphism, especially in the male and female anatomy.
2. Anal Styles in Males
- Male cockroaches possess a pair of short, thread-like structures known as anal styles.
- These styles are used during mating and are a distinguishing feature of male cockroaches, helping to differentiate them from females.
3. Other Statements Explained
- Nervous System:
- The statement about the nervous system being located dorsally and consisting of segmentally arranged ganglia is true, but it does not pertain to the unique identifying features of the species in the context of the question.
- Malpighian Tubules:
- While it is true that Periplaneta americana has Malpighian tubules, they are not specifically described as 'very long' nor are there exactly 16; the number can vary.
- Grinding of Food:
- Grinding of food is primarily done by the mouthparts, but the role of the gizzard and the digestive system is also crucial for food processing, making this statement misleading.
Conclusion
- Therefore, option 'B' is correct as it accurately reflects a unique characteristic of male Periplaneta americana, highlighting the importance of reproductive structures in distinguishing sexes in this species.

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