GATE ES Soil chemistry PYQs & Answers

Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.

Carbon cycle, nitrogen cycle and phosphorus cycle play important role in the ecosystems. Which of the following statement(s) is/are NOT correct about the phosphorus cycle?

Your answerSelect all correct options. You can choose more than one.

Shortage of phosphorus can be a limiting factor in many ecosystems, however, its excess can stimulate eutrophication.

Organic phosphates exist in various rock and soil minerals.

Like carbon cycle, phosphorus also has a gaseous phase and can move into far away ecosystems.

Human interventions like application of phosphorus fertilizers cause much phosphorus to get into the ocean.

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The characteristics of a water sample are as follows: Na⁺ = 92 mg/L, K⁺ = 19.5 mg/L, Ca²⁺ = 40 mg/L, and Mg²⁺ = 24 mg/L. What is the sodium adsorption ratio (SAR) of the water sample which may be considered for irrigation purposes?

[Atomic weight (g/mol): Na = 23, K = 39, Ca = 40, and Mg = 24]

Your answerChoose one option.

2.83

1.94

2.00

4.00

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GATE ES Soil chemistry PYQs

How to practice Soil chemistry

Question 50

Question 34