Fertilizers — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Fertilizers MCQs with step-by-step solutions (8 questions). Part of Substances in Daily Use & Applied Chemistry. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Fertilizers · medium · theory
The three main nutrients supplied by fertilizers to plants are:
A. carbon, oxygen and hydrogen
B. silicon, sulphur and lead
C. sodium, chlorine and iron
D. nitrogen, phosphorus and potassium ✓ Correct
Solution: N, P and K (the NPK nutrients) are the primary plant nutrients supplied by fertilizers.
Q2 — Fertilizers · medium · theory
Urea is a widely used ______ fertilizer:
A. nitrogenous ✓ Correct
B. micronutrient
C. phosphatic
D. potassic
Solution: Urea supplies nitrogen, so it is a nitrogenous fertilizer.
Q3 — Fertilizers · hard · theory
Excessive use of chemical fertilizers can pollute water bodies and cause:
A. purer water
B. less algae
C. no effect
D. eutrophication (excess algal growth) ✓ Correct
Solution: Fertilizer run-off enriches water with nutrients, causing algal blooms (eutrophication) that harm aquatic life.
Q4 — Fertilizers · medium · theory
Compared with chemical fertilizers, manure is better for the soil because it:
A. adds humus and improves soil structure ✓ Correct
B. makes the soil hard
C. removes all nutrients
D. adds only nitrogen
Solution: Manure enriches the soil with organic matter (humus), improving its texture and fertility.
Q5 — Fertilizers · hard · theory
Fertilizers differ from manure in that fertilizers are:
A. always organic
B. free of nutrients
C. made from decomposed plant/animal waste
D. manufactured chemicals rich in specific nutrients ✓ Correct
Solution: Fertilizers are industrially produced and nutrient-specific, unlike organic manure.
Q6 — Fertilizers · easy · theory
The three main nutrient elements supplied to crops by chemical fertilizers are
A. carbon, hydrogen and oxygen
B. sodium, chlorine and calcium
C. iron, copper and zinc
D. nitrogen, phosphorus and potassium ✓ Correct
Solution: The three major nutrients that fertilizers provide are nitrogen (N), phosphorus (P) and potassium (K), together written as NPK. Plants obtain carbon, hydrogen and oxygen from air and water.
Q7 — Fertilizers · medium · theory
Urea is spread over fields mainly to encourage healthy green, leafy growth in plants. This is because urea is a fertilizer especially rich in
A. phosphorus
B. potassium
C. calcium
D. nitrogen ✓ Correct
Solution: Urea is a nitrogenous fertilizer. Nitrogen is used to build proteins and chlorophyll, so it promotes vigorous green, leafy growth. Phosphorus and potassium have other roles such as root, flower and fruit development.
Q8 — Fertilizers · hard · numerical
Urea has the formula CO(NH2)2 and a molar mass of 60 g/mol. It contains two nitrogen atoms, each of atomic mass 14. The percentage of nitrogen by mass in urea is about
A. 35 percent
B. 60 percent
C. 47 percent ✓ Correct
D. 23 percent
Solution: Mass of nitrogen in one formula unit = 2 × 14 = 28. Percentage of nitrogen = (28 / 60) × 100, which is about 46.7 percent, that is roughly 47 percent. This high nitrogen content makes urea a very effective nitrogen fertilizer.