Question

The respiratory organs of the silkworm is called
A. Lungs
B. Tracheae
C. Malpighian tubules
D. Skin

Answer 1

Hint: The respiratory system of silkworm consists of a series of rigid tubes, known as called tracheae. The tracheas connected to the outside via pairs of pores called spiracles.

Complete answer: First, we will discuss the respiratory organ of the silkworm.
1. Tracheae are the respiratory organ of the silkworm.
2. Tracheae are the longitudinal connecting air-tube between the lateral series of spiracles and the radiating branches of the bronchial.
3. The tracheae carry oxygen from the spiracles to the body of the insect.
4. The branches of the bronchial finally deliver the oxygen to the tissues of the organs.
5. Insects exchange oxygen and carbon dioxide with the help of tracheae.
6. Spiracles are the opening hole.
7. In the case of the grasshopper, the first and third thoracic segments have spiracles on each side of the body.

Additional information: Lungs are the respiratory of the higher order animals.
Skin is not such a respiratory organ. But it serves as a respiratory organ in case of reptiles when they undergo hibernation.
Malpighian tubules are the excretory organs of insects.

So, the final answer is option B. Tracheae.

Note: Malpighian tubules and Malpighian corpuscles are different from each other. The first one is the excretory organ of insects and the later is the part of the nephron which is the structural and functional unit of the kidney, the excretory organs of higher-order vertebrates.