Does soil erosion affect the fertility of soil? How?
Yes, soil erosion removes the fertile top layer of the soil thereby, exposing the hard rocky lower layers which are... View Article
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Ignition temperature of __________ is lower than that of wood.
Ignition temperature of Petrol is lower than that of wood. Ignition temperature is an important property of any fuel because... View Article
Which liquid metal is used for making thermometers?
Mercury Mercury is the only one in liquid state at room temperature. Due to its high coefficient of expansion, mercury... View Article
Name two soft metals which can be cut with a knife.
Sodium and potassium are two metals which are soft and can be cut with a knife. Earth metals or the... View Article
Why is organic matter important for crop production?
Organic matter is important for crop production because: It helps in improving soil structure. It helps in increasing water holding... View Article
Why are antibiotics not effective for viral disease?
Antibiotics are useless against viral infections. This is because viruses are so simple that they use their host cells to... View Article
Name any three diseases transmitted through vectors.
Disease that results from an infection transmitted to humans and other animals by blood-feeding anthropods, such as mosquitoes, ticks, and... View Article
Epithelial cells with cilia are found in___of our body
Epithelial cells with cilia are found in the respiratory system of our body. Explanation Minute hair like structures lining the... View Article
In females, the uterine wall thickens to receive the __________.
In females, the uterine wall thickens to receive the fertilized egg The egg gets fertilized with sperm at oviduct to... View Article
Give reason: LPG is a better domestic fuel than wood.
LPG is a better domestic fuel than wood. LPG has more calorific value and produces no pollution. So it is... View Article
Fuel must be heated to its ____________ before it starts burning.
Fuel must be heated to its Ignition temperature before it starts burning. Explanation The ignition temperature of a substance is the minimum... View Article
Differentiate between an autotroph and a heterotroph
Autotrophs Heterotrophs Some organisms such as plants make their own food from simple substances. They are called autotrophs and the... View Article
Explain the role of the Sun in the formation of soil.
It heats up the rocks during the day. Heating causes the rocks to expand. During night, the rocks cool and... View Article
Give any four factors necessary for a healthy person.
The WHO defines health as a state of “complete physical, mental and social well-being and not merely the absence of... View Article
Anabaena belongs to the kingdom Monera. (True or False)
True Explanation Anabaena is a genus of cyanobacteria or blue-green algae. It belongs to the kingdom Monera. They have the... View Article
It is said, “CO2 contributes to global warming.” Explain.
Global warming is a gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels... View Article
How are even small animals important in an ecosystem?
Even small organisms are important in an ecosystem because every organism forms a part of food chain/food web/ecosystem. Every little... View Article
Most of the plastics are biodegradable. (True or False)
False Plastics are non-biodegradable. Most plastics are non-biodegradable mainly because plastic is widely used because of its low cost, versatility... View Article
Coke is the almost pure form of carbon. (True or False)
True Explanation Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is... View Article
CNG is more polluting fuel than petrol. (True or False)
False Explanation Compressed natural gas (CNG) is a less polluting fuel than petrol and diesel. CNG (Compressed Natural Gas) is... View Article
