Deficiency of K+ causes_____________?
Correct answer: C. Premature death of leaves
- A. Stunted growth & strong chlorosis
- B. No electron transport chains
- C. Premature death of leaves
- D. Stunted growth of roots
Explanation
Potassium regulates enzyme activity, osmotic balance and movement of materials in plants; its deficiency can cause marginal leaf damage followed by premature death of leaves. Stunted root growth is more characteristically associated with phosphorus deficiency, so students may choose option d by confusing the two mineral-deficiency symptoms.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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