Microbes as biofertilizers — NEET Biology Questions

Practice 30 questions on Microbes as biofertilizers from Microbes in human welfare (NCERT Class 12, Chapter 8). Free samples below — get all 30 in the app.

30 Questions Microbes in human welfare Class 12

Sample Questions — Microbes as biofertilizers

Try 5 questions below from Microbes as biofertilizers. Get all 30 in the MedicNEET app.

MCQ
An ideal biocontrol agent:
  • A. Eradicates all pests permanently
  • B. Reproduces faster than the pest
  • C. Enhances plant photosynthesis
  • D. Is chemically synthesised
✅ Correct Answer: B
Ensures the biocontrol agent keeps pest numbers in check.
MCQ
Q1. Why is total eradication of pests not the aim of biocontrol methods?
  • A. It is not cost-effective
  • B. It disrupts ecological balance
  • C. It is prohibited by law
  • D. It causes pesticide resistance
✅ Correct Answer: B
Biocontrol maintains pest populations at manageable levels rather than eradicating them.
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MCQ
Q3. Bacillus thuringiensis (Bt) is useful in pest control because:
  • A.It produces a protein toxic to insect larvae
  • B. It digests plant tissue
  • C. It releases repellent hormones
  • D. It causes fungal infections in pests
✅ Correct Answer: A
The Bt toxin kills butterfly caterpillars by binding to gut receptors.
MCQ
Q7. Baculoviruses are preferred over chemical pesticides in forests because:
  • A. They kill a wide range of organisms
  • B. They persist indefinitely in the environment
  • C. They act faster than any chemical
  • D. They are species-specific and non-polluting
✅ Correct Answer: D
Baculoviruses affect only specific insect hosts, sparing beneficial fauna.
MCQ
Baculoviruses are specific to:
  • A. Bacteria
  • B. Nematodes
  • C. Mammals
  • D. Arthropods
✅ Correct Answer: D
They have narrow host range and target insect pests specifically.

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