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.
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