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Question
Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction − upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.

- The air tubes of insects
- Skeletal structures surrounding chest cavity
- Muscular floor of chest cavity
- Tiny pores on the surface of leaf
- Small openings on the sides of the body of an insect
- The respiratory organs of human beings
- The openings through which we inhale
- An anaerobic organism
- An organism with tracheal system
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Solution

- The air tubes of insects → Trachea
- Skeletal structures surrounding chest cavity → Ribs
- Muscular floor of chest cavity → Diaphragm
- Tiny pores on the surface of leaf → Stomata
- Small openings on the sides of the body of an insect → Spiracles
- The respiratory organs of human beings → Lungs
- The openings through which we inhale → Nostrils
- An anaerobic organism → Yeast
- An organism with tracheal system → Ant
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