Biogeochemical cycles

Biogeochemical cycles is a Environment concept from the MPSC syllabus, tested in 3 past MPSC questions (2013, 2022). Below are those real questions with their correct answers and explanations.

Real questions

Years tested

2 · 2013–2022

In context

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Asked in

2022 2013

What mastering this unlocks

Nutrient CyclesHumus Formation

Real questions that test this

परिसंस्था ही निसर्गाचा स्वयं नियामक व स्वयं शाश्वत संरचनात्मक व कार्यात्मक संच आहे. जेथे जैविक व अजैविक घटक एकमेकांमध्ये गुंतलेले असतात ज्यामध्ये खालील क्रिया घडतात : (a) उत्पादकता (b) कुजणे (c) पोषण चक्र (d) उर्जा प्रवाह वरीलपैकी कोणते विधान/विधाने बरोबर आहेत ? Ecosystem is a self-regulatory and self-sustained structural and functional unit of nature where biotic and abiotic components are linked together with the following processes : (a) Productivity (b) Decomposition (c) Nutrient cycling (d) Energy flow Which of the statements given above is/are correct ?

(a)उत्पादकता / Productivity

(b)कुजणे / Decomposition

(c)पोषण चक्र / Nutrient cycling

(d)उर्जा प्रवाह / Energy flow

1)फक्त (a) / Only (a)

2)फक्त (a) आणि (b) / Only (a) and (b)

3)(a), (b), (c) आणि (d) / (a), (b), (c) and (d)✓ Correct

4)(a), (b) आणि (d) / (a), (b) and (d)

An ecosystem functions as a self-regulatory and self-sustained unit through four primary functional processes: productivity, decomposition, energy flow, and nutrient cycling.

रासायनिक पर्यावरणात खालीलपैकी कोणत्या घटकांचा समावेश होतो ? (a) तापमान व माती (b) जल व माती (c) वनस्पती व जल (d) मानवी क्रिया व जैवघटक वरीलपैकी कोणते विधान/विधाने बरोबर आहेत ? (Which of the following factors are included in chemical environment ? (a) Temperature and soil (b) Water and soil (c) Vegetation and water (d) Human functions and Biological components Which of the statements given above is/are correct ?)

(a)तापमान व माती

(b)जल व माती

(c)वनस्पती व जल

(d)मानवी क्रिया व जैवघटक

1)फक्त (a) आणि (b) / Only (a) and (b)

2)फक्त (b) / Only (b)

3)फक्त (c) आणि (d) / Only (c) and (d)

4)यापैकी नाही / None of the above✓ Correct

Chemical environment includes chemical factors of the environment such as nutrients, salinity, and pH of water and soil, making none of the standard pairs exclusively representative of pure chemical environment without biological/physical overlap in the options.

bacteria into humus. The process involved in the early stages of this transformation depends throughout on oxidation : afterwards it takes place in the absence of air. The process is entirely sanitary. There is no nuisance of any kind - no smell, no flies, no dustbins, no incinerators, no artificial sewage system, no water - borne diseases, no town councils, and no rats. On the contrary, the forest affords a place for the ideal summer holiday with sufficient shade and an abundance of pure fresh air. All over the surface of the woods the conversion of vegetable and animal wastes into humus is never so rapid as during the holiday months - July to September. The mineral matter needed by the trees and the undergrowth is obtained from the subsoil. This is collected in dilute solution in water by the deeper roots, which also help in anchoring the trees. Even in soils markedly deficient in phosphorus, trees have no difficulty in obtaining ample supplies of this element. Potash, phosphate, and other minerals are always collected in situ and carried by the transpiration current for use in the green leaves. Afterwards they are either used in growth or deposited on the floor of the forest in the form of vegetable waste being one of the constituents needed in the synthesis of humus. This humus is again utilized by the roots of the trees. Nature’s farming, as seen in the forest, is characterized by two things, a constant circulation of the mineral matter absorbed by the trees and a constant addition of new mineral matter from the vast reserves held in the subsoil.

खालीलपैकी कोणते विधान चुकीचे आहे ? Which of the following statements is incorrect ?

(a)वनखते प्रक्रिया निरंतर चालू असते / Natural forest manuring goes on round the clock.

(b)पावसाळ्यात ती अतिशय शीघ्र असते / It is quicker during monsoons.

(c)वने येथे, उत्पादक, पुरवठादार व उपभोक्ता असतात / Forest acts therein as manufacturer, distributor and consumer.

(d)मानवाचा हस्तक्षेप त्यात नसतो / Man's interference therein is absent

1)(a)

2)(c)

3)(d)

4)वरील कोणतेही नाही / none of the above✓ Correct

All statements (a, b, c, d) regarding natural forest manuring and ecosystems are scientifically accurate, meaning none of them are incorrect.

More Environment concepts

Global warming Greenhouse gases Deforestation Agricultural Economics Biodiversity hotspots Climate Change SONAR Human Development Air Pollution Biosphere Reserves Carbon footprint Montreal Protocol

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