Examkin

Soru

Zorluk: KolayPlant Science and Agricultural Technology

With reference to beneficial microorganisms used as bio-fertilizers in agriculture, which of the following statements are correct?

  1. Rhizobium forms a symbiotic association with leguminous plants to fix atmospheric nitrogen.Cevap
  2. Azotobacter is a free-living, non-symbiotic nitrogen-fixing bacterium found in aerobic soils.Cevap
  3. C
    Azospirillum is a harmful fungal pathogen responsible for causing root rot in cereal crops.
  4. D
    Mycorrhizae are parasitic bacteria that reduce phosphorus absorption in crop plants.

Cevap

The statements confirming Rhizobium's symbiotic nitrogen fixation in legumes and Azotobacter's free-living nitrogen fixation in soils are correct.
Rhizobium forms symbiotic root nodules with legumes to convert atmospheric nitrogen into plant-usable forms, while Azotobacter operates as a free-living nitrogen fixer in soil. Both statements correctly describe their bio-fertilizing roles.

Adım Adım Çözüm

1
Identify the symbiotic nitrogen fixer among bio-fertilizers.
Rhizobium establishes symbiotic root nodule associations with leguminous crops to fix atmospheric nitrogen.
This is a key biological nitrogen fixation process in agriculture.
2
Identify free-living nitrogen-fixing soil bacteria.
Azotobacter fixes atmospheric nitrogen freely without symbiotic root attachment.
It improves soil nitrogen levels independently in aerobic soil conditions.
3
Evaluate the roles of Azospirillum and Mycorrhizae.
Azospirillum is a beneficial associative bacterium, and Mycorrhizae are symbiotic fungi that enhance phosphate uptake, not pathogens or parasitic bacteria.
Both are bio-fertilizing organisms, not crop pathogens or parasitic bacteria.

Anahtar Kavram

Classification and biological functions of bio-fertilizers
Tahmini Süre:45s
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Konular

Plant Science and Agricultural Technology

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