What is sexual dimorphism? With the help of labelled diagrams, exhibit this in Ascaris, Give an account of the life history of Ascaris (IFS 2023/15 Marks)

Sexual Dimorphism:

Sexual dimorphism refers to the differences in physical characteristics between males and females of the same species. These differences can include size, coloration, and other traits that are related to reproduction and mating behaviors.

• Purpose: It aids in distinguishing between genders for various purposes such as mating and survival.
• Examples: In many species, sexual dimorphism manifests in size, color, body structure, or specific appendages.

Sexual Dimorphism in Ascaris

• Diagram:
  
  • In Ascaris, the males and females are morphologically distinct.
  • Males are generally smaller and have a curved tail with spicules for copulation.
  • Females are larger, with a straight, cylindrical body.
  • Diagrams should clearly show these differences, highlighting the size, tail structure, and reproductive organs.
• Male Characteristics:
  
  • Smaller in size, about 15-31 cm in length.
  • Posterior end is curved with a pair of copulatory spicules for attachment during mating.
• Female Characteristics:
  
  • Larger in size, around 20-35 cm.
  • Posterior end is straight, and females contain reproductive structures like ovaries and uterus.

Life History of Ascaris

Please refer to IAS 2023 Question.
Conclusion:
Sexual dimorphism is a common phenomenon in the animal kingdom and can have various implications for behavior, reproduction, and survival. By studying these differences, researchers can gain insights into the evolutionary processes that shape the diversity of life on Earth.