How many spiracles are present in cockroach_____________?
Correct answer: C. 20
- A. 5
- B. 10
- C. 20
- D. 40
Explanation
A cockroach has 10 pairs of spiracles, with two thoracic pairs and eight abdominal pairs. Therefore, 10 pairs x 2 spiracles per pair = 20 spiracles, so students who count pairs as individual openings may choose b.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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