Agriculture Technology — Homi Bhabha Class 9 Biology MCQs with Solutions
Free Homi Bhabha Class 9 Biology Agriculture Technology MCQs with step-by-step solutions (12 questions). Part of Biotechnology & Applied Biology. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Agriculture Technology · medium · theory
The dramatic increase in food-grain production in India through high-yielding varieties is called the:
A. Blue Revolution
B. Green Revolution ✓ Correct
C. Industrial Revolution
D. White Revolution
Solution: The Green Revolution greatly increased crop yields using HYV seeds, fertilizers and irrigation.
Q2 — Agriculture Technology · hard · theory
HYV seeds used in modern agriculture stand for:
A. Highly Volatile seeds
B. Hybrid Yellow Variety
C. High-Yielding Variety seeds ✓ Correct
D. Heavy-Yielding Vegetables
Solution: HYV = High-Yielding Variety — seeds bred to give a larger yield.
Q3 — Agriculture Technology · medium · theory
Bt cotton, which resists certain insect pests, is an example of a:
A. fertilizer
B. tissue-cultured animal
C. natural wild plant
D. genetically modified (GM) crop ✓ Correct
Solution: Bt cotton is genetically modified to produce a protein toxic to specific pests.
Q4 — Agriculture Technology · hard · theory
A water-saving irrigation method that delivers water drop by drop to plant roots is:
A. sprinkler over the whole field
B. rain only
C. flood irrigation
D. drip irrigation ✓ Correct
Solution: Drip irrigation supplies water directly to the roots, minimising wastage.
Q5 — Agriculture Technology · medium · theory
Biofertilizers improve soil fertility using:
A. salt
B. plastic
C. harmful chemicals
D. living organisms such as nitrogen-fixing bacteria ✓ Correct
Solution: Biofertilizers use microbes (e.g. Rhizobium, blue-green algae) to enrich the soil naturally.
Q6 — Agriculture Technology · hard · theory
Growing different crops on the same field in a planned sequence to maintain soil fertility is called:
A. deforestation
B. crop rotation ✓ Correct
C. over-irrigation
D. monoculture
Solution: Crop rotation alternates crops (e.g. cereals and legumes) to keep the soil fertile.
Q7 — Agriculture Technology · medium · theory
Crossing two different varieties of a crop to combine their good qualities is called:
A. grafting only
B. hybridisation ✓ Correct
C. pollution
D. evaporation
Solution: Hybridisation combines desirable traits of two varieties to create an improved crop.
Q8 — Agriculture Technology · easy · theory
The technique of growing plants without soil, with the roots dipped in a nutrient-rich water solution, is called:
A. Apiculture
B. Horticulture
C. Hydroponics ✓ Correct
D. Sericulture
Solution: Hydroponics grows plants in a balanced mineral solution instead of soil. Sericulture is silkworm rearing, apiculture is bee-keeping and horticulture is the cultivation of garden crops.
Q9 — Agriculture Technology · medium · theory
The Green Revolution in India greatly increased food production mainly through the introduction of:
A. Sea-water irrigation
B. Tissue-cultured flowers
C. Genetically engineered animals
D. High-yielding varieties of wheat and rice ✓ Correct
Solution: The Green Revolution was driven by high-yielding, disease-resistant dwarf varieties of wheat and rice grown with fertilisers and assured irrigation, which sharply raised grain output.
Q10 — Agriculture Technology · medium · theory
A farmer wants to enrich the nitrogen content of the soil naturally, without buying chemical fertiliser. The best practice is to:
A. Grow the same wheat crop every season
B. Burn all crop residue on the field
C. Grow a leguminous crop such as gram or pea ✓ Correct
D. Flood the field continuously with water
Solution: Legumes house Rhizobium bacteria in their root nodules, and these bacteria fix atmospheric nitrogen into a usable form, restoring soil nitrogen naturally. Repeating one crop only drains the soil further.
Q11 — Agriculture Technology · hard · numerical
An old wheat variety yields 4 tonnes per hectare. A new high-yielding variety yields 6 tonnes per hectare. If a farmer plants the new variety on 3 hectares, how many extra tonnes does it give compared with the old variety on the same land?
A. 6 ✓ Correct
B. 2
C. 18
D. 12
Solution: Extra yield per hectare = 6 − 4 = 2 tonnes. Over 3 hectares the extra is 2 × 3 = 6 tonnes. The distractor 18 is the total new yield, 12 is the old total and 2 is only the per-hectare gain.
Q12 — Agriculture Technology · hard · theory
Assertion (A): Rotating a cereal crop with a legume crop keeps the soil fertile. Reason (R): The root nodules of legumes contain bacteria that fix atmospheric nitrogen into the soil. Choose the correct option:
A. A is true but R is false
B. Both A and R are true but R does not explain A
C. Both A and R are true and R correctly explains A ✓ Correct
D. A is false but R is true
Solution: The assertion is correct and the reason is the exact mechanism: Rhizobium in legume root nodules fixes nitrogen, replenishing what the cereal removed. So both are true and the reason correctly explains the assertion.