A. Symbiotically
B. Non-symbiotically
C. Can fix A & B
D. None of these
Submitted by: Mir Mehrbiyar
Correct Answer: Non-symbiotically ✔
Last Updated: July 07, 2021
Related MCQs
- Maximum fixation of K occurs:__________?
- Conversion of inorganic P to organic P is known as:_________?
- N and P sprayed on the leaves at time of flowering results in:________?
- How many type of soil colloids?
- Auxin is_______?
- The drawbacks of erosion can be divided into:__________?
- Shallow channels that can be readily corrected by routine tillage operations is called:
- __________ systems play a crucial role in increasing soil organic C storage and reducing net emissions of greenhouse gases in addition to soil erosion control:
- An important component of total soil C is charcoal, also known as:__________?
- Which is the main cause of desertification?
- Deforestation may decrease the chances of__________?
- Extrusive rocks are also called as __________ in which the grain or crystalline structure is too fine to be seen by the unaided eye?
- What civil engineers called soil?
- In alkaline soil which form of phosphorus uptake by plants?
- In acidic soil which form of phosphorus uptake by plants?
- In which form plant uptake phosphorus?
- The forest soils have lower bulk density than agricultural soils because of their ______ content.
- 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:
- 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:
- Nutritive elements needed in large quantities to ensure normal plant development:
- Essentiality criteria of an element :
- In land capability classification, class I-Iv are suitable for:_________?
- Metamorphic rocks are classified into:__________?
- Transportation & cementation of primary rocks:
- Igneous rocks are called:__________?
- The soil air contains a number of gases __________ & water vapours:
- Soil is a variable mixture of Major components:
- Soil-forming minerals occurring in rocks do not contain any water, they undergo __________ when exposed to humid conditions & break down as in chemical weathering process:
- Volcanic soils:
- Inceptisols:__________?
- New soils, no or little profile development:
- The soil quality is always deteriorated by:_________?
- Organic matter decomposes rapidly in Pakistani soils because of __________ conditions, that is why our soils generally have < 1% organic matter:
- The capacity of a soil to function on sustained basis promoting plant & animal health:
- The available soil is being polluted quickly by __________ wastes.
- __________ , considered a perfect soil, is a mixture of silt, clay and sand:
- The unit of a scale used to measure the level of acidity or alkalinity of chemicals is called:
- The following types of check dams have been tried in Pakistan:
- Any tillage and planting system that maintains at least 30% of the soil surface covered by residue after planting for the purpose of reducing soil erosion by water:
- Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
- Inorganic constituents vary in size from fine clay particles _ mm to large _________ mm gravel and rock:
- Organic Soils are classified as and are also known as __________ soils:
- The suitable species for reclamation of saline & sodic soil is:__________?
- Erosion permitting and erosion resisting crops grow alternatively at right angle to the slope of the land is called as:_________?
- The most suitable species for reclamation of sandy soils is:_________?
- The lands which are rich in soluble salts and exchangeable sodium:
- The practice of managing rows of closely planted woody plants with annual crops planted in alleys in between hedges is called as:________?
- In low-rainfall areas, huge shifting sand dunes are commonly found, particularly near human habitations. Techniques of afforesting the shifting dunes needed to be implemented. These techniques consist of__________?
- Pakistan being predominantly an arid and semiarid country, In addition to agricultural productivity losses and increasing poverty, desertification results in significant reductions in _________?
- World biodiversity day is celebrated on:_________?
- Water-erosion can be reduced / controlled by:__________?