All of the following are elements that plants need in very small amounts except___________?
Correct answer: B. Hydrogen
- A. Iron
- B. Hydrogen
- C. Chlorine
- D. Copper
Explanation
Hydrogen is a macronutrient because plants require it in relatively large amounts, mainly as part of water and organic compounds. Iron, chlorine, and copper are micronutrients needed only in small quantities. The likely mistake is choosing iron, because it is important for chlorophyll formation, but importance does not mean that it is required in a large amount.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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