A. Nitrogen
B. Oxygen
C. Carbon
D. Hydrogen
Related Mcqs:
- Humus is present in:
A. Upper soil layer
B. Entire solum
C. Horizon B
D. Entire top-soil - In which type of the forest, humus is formed by the dry and dead leaves:
A. Coniferous forest
B. Alpine
C. Tundra forest
D. Deciduous forest - Humus is:
A. Fully decomposed organic matter only
B. Party decomposed organic matter + CO2
C. Minerals and fully decomposed organic matter
D. Partly decomposed organic matter + mineral + water - The composition of soil air is affected by:
A. Pore size
B. Soil organisms
C. Type of roots
D. All of these - The effects of mulches, irrespective their composition, are attributed to:
A. Suppression of weeds, by restricting the amount of light on the ground surface and the hindering their germination and growth
B. Conservation of soil, by preventing erosion
C. Thermal insulation, leading to greater deposition of dew
D. All of the above - The rate of replacement of species composition with the change in the environment constitutes:
A. Gamma diversity
B. Beta diversity
C. Community diversity
D. Ecosystem diversity - Division of forest into stands on the basis of composition is / are:
A. Pure stand
B. Mixed stand
C. Both (a) & (b)
D. None of these - The control of growing stock, its structure and composition are:
A. Site adaptation
B. Choice of species and provenance
C. Regeneration age and timing of the cut are important consideration
D. Harvesting the produce
E. All of the above - The major effects of mulches, irrespective of their composition, are attributed to:
A. Suppression of weeds, by restricting the amount of light on the ground surface and thus hindering their germination and growth
B. Conservation of soil, by preventing erosion
C. Maintenance or improvement of soil structure, by eliminating or mitigating the severity of rain and wind action
D. All of the above - The chemical produced by the host plant to protect themselves against fungal infection is:
A. Toxin
B. Hormone
C. Phytotoxin
D. Phytoalexin
The correct answer to the question: "By chemical composition the humus has maximum percentage of:" is "Carbon ".
