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
Related Mcqs:
- 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 & BSubmitted by: Shafiq Rehman
- 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. MuckSubmitted by: Shafiq Rehman
- 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 aboveSubmitted by: Shafiq Rehman
- All harvested crops remove plant nutrients from the soil. Whether used for _______________; the various crop products are often consumed far away from the production sites, some times thousands of kilometers away in another country.
A. Food
B. Feed
C. industrial raw materials
D. All of theseSubmitted by: Shafiq Rehman
- Soil Organic Matter (SOM) serves not only as a reservoir of all the required plant nutrients, but it:
A. Provides energy for the microbial
B. Maintains the productivity of soil
C. Gives structure to the soil
D. All of theseSubmitted by: Shafiq Rehman
- Potassium plays a significant role in the transport of water & nutrients through the plant in the xylem. When the supply of K is reduced, the transportation of ___________________ is depressed:
A. Nitrates, Phosphates
B. Calcium, magnesium
C. Amino acids
D. All of the aboveSubmitted by: Shafiq-ur-Rehman
- 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 aboveSubmitted by: Shafiq Rehman
- The process by which nutrients chemicals or contaminants are dissolved and carried away by water, or are moved into a lower layer of soil:
A. Infiltration
B. Percolation
C. Leaching
D. SeepingSubmitted by: Shafiq Rehman
- Soil additive which stabilizes the soil, improves resistance to erosion, increases to permeability to air & water, improves texture, eases cultivation or otherwise improves soil quality:
A. Soil amendment
B. Soil conditioner
C. Both a & b
D. None of the aboveSubmitted by: Shafiq Rehman
- The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_____________________?
A. Eutrophication
B. Nitrification
C. Denitrification
D. Sedimentation