Soil Fertility
Trending Questions
Q.
How are nutrients replenished in the soil?
Q.
Fertile soil has lots of humus. Why?
Q. Why are bases used as fertilizers?
Q.
Explain in detail the different types of soil.
Q.
The leaves of aquatic plants do not decay though these are completely submerged in water. Explain.
Q. Fragmentation, leaching and catabolism are some of the important steps of decomposition. Study the following statements [(i), (ii) and (iii) regarding these and select the correct option.
(i) Detritivores(e.g., earthworm) breakdown detritus into smaller particles.
(ii) Water soluble inorganic nutrients go down into soil horizon and get precipitated as unavailable salts.
(iii) Decomposes(e.g., bacteria and fungi) secrete digestive enzymes and degrade detritus into simpler inorganic substances.
(i) Detritivores(e.g., earthworm) breakdown detritus into smaller particles.
(ii) Water soluble inorganic nutrients go down into soil horizon and get precipitated as unavailable salts.
(iii) Decomposes(e.g., bacteria and fungi) secrete digestive enzymes and degrade detritus into simpler inorganic substances.
- Leaching-(ii), Fragmentation-(iii), Catabolism-(i)
- Leaching-(i), Fragmentation- (ii), Catabolism-(iii)
- Leaching-(ii), Fragmentation-(ii), Catabolism-(i)
- Leaching-(ii), Fragmentation-(i), Catabolism-(iii)
Q. The most fertile soil of India is __________.
- Alluvial soil
- Mountain soil
- Red soil
- Laterite soil
Q. The best soil for healthy and vigorous growth of most plants is
- Sandy soil
- Loam soil
- Clay soil
- None of these
Q. Alluvial soil is mostly found in which region
- Southern India
- Northern India
- Gangetic Jamuna Plains
- Eastern India
Q. A few gram seeds were placed in each of the three pots A, B, and C containing soil. The soil in Pot A is mixed with some green twigs and leaves. The soil in pot B is mixed with old cow dung while soil of pot C is mixed with urea. Pots are watered regularly. Which of the following will be observed after 10 days?
- Lot of growth in A
- Not much growth in B
- Very little growth in A but lot of growth in B and C
- Lot of growth in B but very little growth in C
Q. Fertile soil has lots of humus. Why?
Q. Which of the following is NOT an organic manure?
- Cow dung
- Fish manure
- Goat droppings
- Urea
Q. What are epiphytes?
Q. Soil is losing its fertility due to increased use of _________.
- Organic manure
- Irrigation
- HYV seeds
- Chemical fertilizers
Q. What kind of soil is most suitable for plant growth? Why?
Q. Which of the following soils is suitable for cultivation of almost all kinds of crops?
- Black soil
- Red soil
- Laterite soil
- Alluvial soil
Q. Which of the following soil is the most fertile?
- Alluvial soil
- Red soil
- Black soil
- Laterite soil
Q. Which of the following is incorrect for the given figure?
- It is a type of cropping pattern called intercropping.
- The given cropping pattern increases the productivity of crops per unit area.
- The given cropping pattern helps in maintaining soil fertility and makes better use of resources.
- None of these.
Q. Soil fertility is reduced by?
- Crop rotation
- Nitrogen fixing bacteria
- Decaying organic matter
- Intensive agriculture
Q.
________ soils are usually very productive soils but may be deficient in nitrogen, humus, and phosphorus.
Q. Define soil fertility.
Q. The possible beneficial affect of grazing animals is the
- Removal of wild animals
- Removal of wild plants
- Eradication of weeds
- Addition of their excreta to the soil
Q.
Lichens are called pioneer colonizers of bare rock. How can they help in the formation of soil?
Q. Soil fertility is determined by its ability to
- Decay organic matter
- Hold organic matter
- Retain nutrients
- Support life