16. Which process allows plants to convert nitrogen gas into usable forms?
a) Photosynthesis
b) Assimilation
c) Nitrogen fixation
d) Transpiration
Answer: c) Nitrogen fixation
17. Which of the following nutrients is necessary for chlorophyll production in plants?
a) Iron
b) Potassium
c) Phosphorus
d) Calcium
Answer: a) Iron
18. Plants obtain the majority of their water through their:
a) Stems
b) Leaves
c) Flowers
d) Roots
Answer: d) Roots
19. The process by which plants release excess water vapor through small openings in their leaves is called:
a) Transpiration
b) Osmosis
c) Absorption
d) Assimilation
Answer: a) Transpiration
20. Which of the following is NOT a macronutrient essential for plant growth?
a) Calcium
b) Potassium
c) Nitrogen
d) Zinc
Answer: d) Zinc
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