Chapter 11: Agricultural Microbiology — Online MCQ Test
MICROBIOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 11: Agricultural Microbiology with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers plant-microbe interactions plant disease etiology biocontrol agents and biopesticides. Students study Rhizobium Azotobacter biofertilizer applications and plant....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 11: Agricultural Microbiology — Important Questions & Answers
Which of the following is a free-living nitrogen-fixing bacterium used as a biofertilizer?
- A. Rhizobium
- B. Azotobacter
- C. Agrobacterium
- D. Bacillus subtilis
Answer: B. Azotobacter
Azotobacter is a genus of free-living diazotrophic bacteria which are used as biofertilizers in agriculture.
Azotobacter is a genus of free-living diazotrophic bacteria which are used as biofertilizers in agriculture.
The symbiotic association between fungi and roots of higher plants is called:
- A. Mycorrhiza
- B. Rhizosphere
- C. Phyllosphere
- D. Nodulation
Answer: A. Mycorrhiza
Mycorrhiza refers to the mutualistic symbiotic association between a fungus and the roots of a vascular plant.
Mycorrhiza refers to the mutualistic symbiotic association between a fungus and the roots of a vascular plant.
Rhizobium bacteria establish a symbiotic relationship specifically with plants of the family:
- A. Solanaceae
- B. Fabaceae
- C. Poaceae
- D. Brassicaceae
Answer: B. Fabaceae
Rhizobium bacteria form symbiotic root nodules in leguminous plants belonging to the family Fabaceae.
Rhizobium bacteria form symbiotic root nodules in leguminous plants belonging to the family Fabaceae.
Why is the inoculation of leguminous crops with Rhizobium considered an environment-friendly practice?
- A. It increases the need for chemical nitrogen fertilizers
- B. It reduces the dependence on synthetic nitrogen fertilizers
- C. It eliminates the need for water entirely
- D. It replaces the need for photosynthesis
Answer: B. It reduces the dependence on synthetic nitrogen fertilizers
Biological nitrogen fixation by Rhizobium reduces the need for energy-intensive synthetic fertilizers, lowering nitrogen runoff.
Biological nitrogen fixation by Rhizobium reduces the need for energy-intensive synthetic fertilizers, lowering nitrogen runoff.
A student isolates a bacterium that produces a toxin specific to Lepidopteran larvae. What is the most likely identity and application?
- A. Rhizobium; seed treatment
- B. Bacillus thuringiensis; biopesticide
- C. Agrobacterium; plant growth promoter
- D. Trichoderma; fungicide
Answer: B. Bacillus thuringiensis; biopesticide
Bacillus thuringiensis produces specific Cry toxins that kill Lepidopteran larvae, making it a highly effective biopesticide.
Bacillus thuringiensis produces specific Cry toxins that kill Lepidopteran larvae, making it a highly effective biopesticide.