Page 54 - Agronomy-Soil.Sci-Horticulture objective AFO

Which is a symbiotic nitrogen-fixing

bacteria: (IBPS AFO Mains AFO 2020)

1. Rhizobium

2. Cyanobacteria

3. Azotobacter

4. Clostridium

5. Azospirillium

ans:- a. Rhizobium

Which of the following instrument used to measure soil

moisture? (IBPS AFO Mains AFO 2021)

1. Tensiometer

2. Hygrometer

3. Anemometer

4. Aerometer

5. Pycnometer

ans:- a. Tensiometer

Water holding capacity decreasing order. (IBPS AFO Mains AFO

2021)

1. Clay>Silt>Sand

2. Sand>Silt>Clay

3. Silt>Sand>Clay

4. Clay>Sand>Silt

5. Sil>Clay>Sand

ans:- a. Clay>Silt>Sand

Which one is not sedimentary rocks? (IBPS AFO Mains AFO
2021)

53