Explanation: Clay can have a very high porosity. Because its grains are very small, there are a lot of (small) pore spaces in between them. What clay does not have is good permeability, which is a measure of how "connected" these pore spaces are. Clay can hold a lot of water, but it doesn't let it flow very well.
Consider the following statements:
1. Coarse sand is more than a million times permeable than a high plasticity clay.
2. The permeability depends on the nature of soil and not on properties of liquid flowing through soil.
3. If a sample of sand and a sample of clay have the same void ratio, both samples will exhibit the same permeability.
4. Permeability of soil decreases as the effective stress acting on the soil increases.
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1. Coarse sand is more than a million times permeable than a high plasticity clay.
2. The permeability depends on the nature of soil and not on properties of liquid flowing through soil.
3. If a sample of sand and a sample of clay have the same void ratio, both samples will exhibit the same permeability.
4. Permeability of soil decreases as the effective stress acting on the soil increases.
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__ has long been known as the ‘Leningrad of Bihar’ or as ‘Mini Moscow’.
Anonymous Quiz
8%
Muzaffarpur
13%
Purnia
68%
Begusarai
13%
Gaya
Symbiotic relationships are close associations between two different species. Mutualism is a symbiotic relationship where both organisms benefit. Which of the following is an example of mutualism?
Anonymous Quiz
4%
a) A lion hunting and consuming a gazelle for food.
26%
b) A tapeworm living inside an animal's intestine and absorbing nutrients.
61%
c) A clownfish living among the tentacles of an anemone for protection.
9%
d) A mistletoe plant growing on a tree and stealing nutrients from its host.
Commensalism is a symbiotic relationship where one organism benefits while the other is neither harmed nor benefitted. Which of the following is an example of commensalism?
Anonymous Quiz
5%
a) A tick feeding on the blood of a deer, causing harm to the deer.
35%
b) Barnacles attached to the shell of a whale, hitchhiking for dispersal.
55%
c) A bee pollinating a flower while collecting nectar for food.
5%
d) A wolf stealing food from a lion's kill, negatively impacting the lion.
Laterite soil is a type of red-colored soil found extensively in India. What is a unique characteristic of laterite soil that makes it less suitable for agriculture in its natural state?
Anonymous Quiz
53%
a) Low organic matter content and poor nutrient availability.
11%
b) High clay content leading to waterlogging issues.
5%
c) High salinity levels, making it unsuitable for most crops.
32%
d) Sandy texture with poor water retention capacity.
Soil erosion is a major environmental concern in India. Shifting cultivation, a traditional practice in some regions, can contribute to soil erosion. What is a characteristic of shifting cultivation that contributes to this problem?
Anonymous Quiz
0%
a) Focus on growing a variety of crops together, promoting soil health.
40%
b) Continuous cultivation of the same land for extended periods.
53%
c) Short-term cultivation followed by a fallow period for natural recovery.
7%
d) Extensive use of chemical fertilizers, leading to soil degradation.
Salinization of soil is a growing problem in some parts of India. What is a potential consequence of increased soil salinization?
Anonymous Quiz
0%
a) Improved soil fertility due to the presence of additional minerals.
56%
b) Reduced water availability for plants due to higher osmotic pressure.
13%
c) Increased activity of soil microbes due to a favorable environment.
31%
d) Enhanced growth of salt-tolerant plant species in the affected area.
👍1
Red soils are another significant soil type in India, particularly in the peninsular region. These soils are known for their reddish color due to the presence of iron oxides. What is a challenge associated with managing red soils for agriculture?
Anonymous Quiz
69%
a) Low organic matter content and inherent deficiencies in phosphorus.
13%
b) High clay content leading to waterlogging and drainage issues.
6%
c) High salinity levels requiring special techniques for cultivation.
13%
d) Sandy texture with rapid drainage and frequent irrigation needs.