Which of the following metals can displace the other two metals from their salt solutions?
Zinc>Iron>Copper (Order of reactivity) As we can see that zinc is the most reactive metal and copper is the least... View Article
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AIDS cannot be transmitted by (a) sexual contact (b) hugs (c) breast feeding (d) blood transfusion
b) Hugs Explanation AIDS or Acquired Immune Deficiency Syndrome is a disease caused by the HIV. In this condition, a... View Article
Which of the following is not a way to conserve water? (a) replace (b) reduce (c) reuse (d) recycle
(a) replace Replace is not a way to conserve water. At our individual level, we should consciously save water and... View Article
Deforestation leads to an increase in the water holding capacity of the soil. (True or False)
b) False Deforestation, clearance or clearing is the removal of a forest or stand of trees where the land is... View Article
We read in newspapers that burning of fuels is a major cause of global warming. Explain why?
Burning of fuels causes global warming. The statement is correct. Fossil fuels are generally the mixtures of carbon based compounds.... View Article
Under high temperature and pressure, dead plants get slowly converted to coal. (True or False)
True The dead remains of plants buried under earth’s surface under high pressure and temperature and in absence of air... View Article
Which non-metal is essential for our life and all living beings inhale it during breathing?
An essential non-metal used in breathing by all living beings is ‘Oxygen’ Metals and Non-metals are different types of materials... View Article
A disease in human beings caused by a virus is _______. (a) Typhoid (b) Influenza (c) Dysentery (d) Cholera
Influenza Influenza is a viral infection while diphtheria, cholera and typhoid are all bacterial infections because of Corynebacterium diphtheriae, Vibrio... View Article
Name the correct substrates for the following enzymes (a) Trypsin (b) Amylase (c) Pepsin (d) Lipase
The substrates for the following enzymes are (a)Trypsin – Protein Trypsin breaks proteins into smaller peptides in the duodenum. It... View Article
Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?
The oxygen content of water is much less than the oxygen content of air and hence rate of breathing is... View Article
Which one of the following causes kala-azar? (a) Ascaris (b) Trypanosoma (c) Leishmania (d) Bacteria
c) Leishmania Explanation Kala azar is a slow advancing and naturally occurring disease that is caused by a protozoan parasite... View Article
Define the terms and give one example of each (a) Bilateral symmetry (b) Coelom (c) Triploblastic
(a) Bilateral symmetry: When the body is divided into identical left and right halves in only one plane, it is... View Article
Fats are stored in human body as (a) cuboidal epithelium (b) adipose tissue (c) bones (d) cartilage
b)Adipose tissue Fats are stored as fatty acids. Adipose tissues are loose connective tissues found below the skin and between the... View Article
Name the female hormone produced by ovaries that helps in the development of mammary glands
Estrogen is the female hormone produced by ovaries that helps in development of mammary glands. Estrogen is the female sex... View Article
Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.
Following reasons can be considered to discourage the use of wood as a fuel- It has a high ignition value,... View Article
Name two major non-metals which are present in fertilisers and enhance the growth of plants.
(i) nitrogen (ii) phosphorus Nitrogen is used by plants for lots of leaf growth and good green colour. Phosphorous is... View Article
Cell arise from the pre-existing cells was stated by (a) Haeckel (b) Virchow (c) Hooke (d) Schleiden
(b) Virchow Virchow expanded Scheiden’s cell theory and stated that cells arise from pre-existing cells. The cell theory was given... View Article
Discuss why pesticides are used in very accurate concentration and in very appropriate manner?
Pesticides are used in very accurate concentration and in a very appropriate manner due to the following reason. (a) Harms... View Article
Lichens are called pioneer colonisers of bare rock. How can they help in the formation of soil?
Lichens release chemical substances to break the rocks into smaller particles and hence make soil. They enrich the soil by... View Article
Viruses, which cause hepatitis, are transmitted through (a) air (b) water (c) food (d) personal contact
b) Water Explanation Hepatitis is an inflammatory condition of the liver. It disturbs various metabolic processes such as bile production,... View Article
