Male and female cockroaches can be distinguished externally through:
Correct answer: A. Anal styles in male
- A. Anal styles in male
- B. Anal cerci in female
- C. Anal style and antennae in females
- D. Both (b) and (c)
Explanation
In a male cockroach, the 9th sternum bears a pair of short, unjointed threadlike anal styles which are absent in the female. Anal cerci and antennae are present in both male and female cockroaches.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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