Answer: Option D. -> Podsols
Answer: (d)
Podsols are ash-grey coloured soils that are found in high-latitude coniferous forest belt having very long cold winters, short cool summers and moderate precipitation throughout the year.
These soils are acidic, infertile and of limited value for agriculture. These are useful for dairying and mixed farming.

Answer: Option D. -> Brazil
Answer: (d)

Answer: Option B. -> None of the above
Answer: (b)

Answer: Option C. -> cotton
Answer: (c)
Black soils locally called regard or black cotton soils, and internationally known as 'tropical black piles of the earth' or 'tropical chernozems' have been developed by the weathering of the Deccan lava in India.
They are highly retentive of moisture, extremely compact and tenacious when wet, considerably contracted developing deep wide cracks on drying and selfploughing and are credited with high fertility of crops like cotton.

Answer: Option A. -> Sedimentary
Answer: (a)

Answer: Option A. -> Hiltner
Answer: (a)
Lorenz Hiltner is recognized as the first scientist to coin the term “rhizosphere” in 1904. The word is derived from the Greek word ‘rhiza’, meaning root, and ‘sphere’, meaning field of influence.
Hiltner defined the rhizosphere as the zone of soil immediately adjacent to legume roots that support high levels of bacterial activity.

Answer: Option D. -> China, Brazil, Australia
Answer: (d)

Answer: Option D. -> Brazil and Vietnam
Answer: (d)

Answer: Option C. -> Iron
Answer: (c)

Answer: Option D. -> Sedimentary rock
Answer: (d)The significant quantity of upper soil is formed by Sedimentary rock.