Soil Organic Matter (SOM) serves not only as a reservoir of all the required plant nutrients, but it:

Related Mcqs:

1. Soil Organic Matter (SOM) which consists of about _______ % organic carbon plays a vital role by providing macro & micro nutrients:

   A. 72 % B. 58% C. 62 % D. Al of the above Submitted by: Shafiq Rehman...

2. Previously Essential nutrients required for the growth of plants were sixteen. In recent time the essential nutrients required for the growth of plants are:_________?

   A. 16 B. 17 C. 18 D. None of the above Submitted by: Shafiq Rehman...

3. Organic matter decomposes rapidly in Pakistani soils because of ____________ conditions, that is why our soils generally have < 1% organic matter:

   A. High temperature B. Alkaline C. Both a & b D. None of a & b Submitted by: Shafiq Rehman...

4. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:

   A. Mull B. Mulch C. Mycorrhizae D. Muck Submitted by: Shafiq Rehman...

5. From the sources of plant nutrients availability in soil, which of the following statements are correct:

   A. The plant absorbs carbon as carbondioxides directly from the atmosphere. B. Water is the source of hydrogen C. Air & water is the source of oxygen & the chief source of soil nitrogen is organic matter & when organic matter decomposes it gives ammonia. D. All of the above Submitted by: Shafiq Rehman...

6. The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:

   A. Physical B. chemical C. Biological D. both A & B Submitted by: Shafiq Rehman...

7. The indicator used for the the estimation of the organic matter or organic carbon is;_________?

   A. Mixed indicator B. Diphenylamine indicator  C. Both a and b D. None of the above Submitted by: Shafiq Rehman...

8. Soils that have more than 20% organic matter are termed as organic soils. These are also called:________?

   A. Peat soil B. solonchalk soil C. Muck soil D. Both a and c Submitted by: Shafiq Rehman...

9. Walkley and blacks method of organic matter determination allows recovery of ______ ℅ organic carbon content:

   A. 44 ℅ B. 45 ℅ C. 33℅ D. None of the above Submitted by: Shafiq Rehman...

10. Walkley and Blacks method of organic matter determination allows recovery of _____% organic carbon content:

    A. 74 % B. 54 % C. 62.5 % D. 34% Submitted by: Shafiq Rehman...