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Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
In species, variations that offer survival advantages are naturally selected. Individuals adjust to their environments with the help of these selected variations and consequently these variations are passed on to...
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Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Geographical isolation can prevent the transfer of pollens among different plants. However, since the plants are self-pollinating, which means that the pollens are transferred from the anther of one flower...
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Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Geographical isolation prevents gene flow between populations of a species whereas asexual reproduction generally involves only one individual. In an asexually reproducing organism, variations can occur only when the copying...
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Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?
Wings of a butterfly are composed of membrane, while wings of a bat are composed of bony skeleton. Hence, these are not homologous organs rather analogous organs.
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In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a ‘better’ body design? Why or why not?
Evolution cannot always be equated with progress or better body designs. Evolution simply creates more complex body designs. However, this does not mean that the simple body designs are inefficient....
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Can any source of energy be pollution-free? Why or why not?
No source of energy can be pollution-free. It is considered that solar cells are pollution-free. However, even their making causes environmental damage indirectly. Also, in the case of nuclear energy,...
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Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Hydrogen can be considered a cleaner fuel because its burning produces water vapour which is non-polluting. However, due to explosive nature of hydrogen, its storage and transportation is difficult
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Can you think of any other way in which you use the warmth from your breath?
Another way in which we can use the warmth of our breath is when someone gets swelling and redness in the eyes or some warm breath on a piece of...
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Take a deep breath in Ask your friend to measure your chest with a thread. Measurement ….. Now breathe out.
Measurement of the chest on taking a deep breath is 24 cm. Measurement of the chest on taking breath out is 20 cm. Yes, there is a difference in the measurements. The...
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In a hospital an oxygen cylinder holds 10 L of oxygen at 200 atm pressure. If a patient breathes in 0.50 ml of oxygen at 1 atm with each breath,
Apply Boyle’s Law P1 V 1= P 2 V 2 200 x 10 = 1 x V 2 V2 =2000 L No. of breaths = Total volume/ vol. consumed per breath =2000/0.5x10 -3 L =4x106
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