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Which of the following features is used ...

Which of the following features is used to identify a male cockroach from a female cockroach

A

Forewings with darker tegmina

B

Presence of caudal styles

C

Presence of a boat shaped sternum on the `9^(th)` abdominal segment

D

Presence of anal cerci

Text Solution

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The correct Answer is:
To identify a male cockroach from a female cockroach, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Sexual Dimorphism**: - Cockroaches exhibit sexual dimorphism, meaning that male and female cockroaches have distinct physical characteristics that allow us to differentiate between them. 2. **Examining the Body Structure**: - A cockroach's body is segmented into three main parts: the head, thorax, and abdomen. Both male and female cockroaches have these segments, but they differ in some features. 3. **Analyzing the Options**: - **Option A**: Four wings with darker tegmina. - Both male and female cockroaches have two pairs of wings (forewings and hindwings), and these do not differ significantly between sexes. This option is not useful for differentiation. - **Option B**: Presence of caudal style. - The caudal style (or anal style) is a pair of thread-like structures found only on the male cockroach's 10th abdominal segment. This feature is absent in females, making it a distinguishing characteristic. - **Option C**: Broad-shaped sternum on the 9th abdominal segment. - The broad-shaped sternum is actually found on the 7th abdominal segment of females, forming a genital pouch. This feature is not useful for identifying males. - **Option D**: Anal saccae. - Anal saccae are present in both male and female cockroaches, so this option does not help in distinguishing between the sexes. 4. **Conclusion**: - The only feature that can be used to identify a male cockroach from a female cockroach is the presence of the caudal style (anal style). Therefore, the correct answer is **Option B**.

To identify a male cockroach from a female cockroach, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Sexual Dimorphism**: - Cockroaches exhibit sexual dimorphism, meaning that male and female cockroaches have distinct physical characteristics that allow us to differentiate between them. 2. **Examining the Body Structure**: ...
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Knowledge Check

  • Male cockroach differs from female cockroach in having

    A
    antennae
    B
    labrum
    C
    maxillae
    D
    anal styles
  • Which one of the following statements is correct regarding cockroach ?

    A
    Head is oval is shape
    B
    There are 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
    C
    Heart is differentiated into funnel shaped chambers with setae on either side
    D
    Each eye consists of about 1000 hexagonal ommatidia
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