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Which elements form most of the protoplasm?
AIron, copper, zinc, manganese and cobalt
BCarbon, hydrogen, oxygen, nitrogen and sulphur
CSodium, potassium, calcium, magnesium and chlorine
DSilicon, aluminium, phosphorus, helium and neon
Answer & Solution
Correct answer: B. Carbon, hydrogen, oxygen, nitrogen and sulphur
1. The chapter section 2.9 lists the common protoplasm elements.
2. It names carbon, hydrogen, oxygen, nitrogen, sulphur, iron and phosphorus.
3. C, H, O, N and S dominate; iron and phosphorus appear in trace amounts.
4. So option A lists the major elements.
_Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.9 Protoplasm_
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