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Anatomy of Cockroach Video Lecture | Crash Course for NEET

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1. What are the main external features of a cockroach?
Ans. The main external features of a cockroach include a flattened body, which is divided into three main parts: the head, thorax, and abdomen. The head has compound eyes, long antennae, and mouthparts suited for chewing. The thorax consists of three segments, each with a pair of legs, and the first two segments have wings. The abdomen is segmented and contains the reproductive and excretory organs.
2. How does the respiratory system of a cockroach function?
Ans. The respiratory system of a cockroach does not use lungs. Instead, it consists of a network of tubes called tracheae that deliver oxygen directly to the tissues. Air enters through openings called spiracles located on the sides of the body, and the tracheae branch into smaller tubes, facilitating gas exchange at the cellular level.
3. What is the role of the digestive system in a cockroach?
Ans. The digestive system of a cockroach is responsible for breaking down food and absorbing nutrients. It includes the foregut (for storage and grinding), midgut (for digestion and absorption), and hindgut (for water reabsorption and waste elimination). Enzymes secreted in the midgut help in the digestion of carbohydrates, proteins, and fats.
4. What is the significance of the nervous system in a cockroach?
Ans. The nervous system of a cockroach consists of a brain and a ventral nerve cord with ganglia. It coordinates the cockroach's movements, responses to stimuli, and complex behaviors like walking, flying, and mating. The system allows for rapid reflex actions, ensuring the cockroach's survival in its environment.
5. How does the reproductive system of a cockroach operate?
Ans. The reproductive system of a cockroach varies between males and females. Males have a pair of claspers to hold the female during mating, and they produce sperm in their testes. Females have an ovary that produces eggs, and after fertilization, they lay eggs in a protective case called an ootheca. The ootheca can contain multiple eggs, ensuring the survival of the species.
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