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Selection is an important technique in plant breeding. It involves picking the healthiest and the best ones out of the entire crop and reproducing them under controlled condition..

Charles Darwin and Alfred Russel Wallace proposed that nature has its own ways of selecting the best from the available species for continuation of life. Darwin became famous for his Theory of evolution by natural selection, the mechanism of which works as follows: Individuals of a spe..

This law could be best applied, only up to the element calcium. Newly discovered elements could not fit into the octave structure. The feature of resemblance of the 8 th element when arranged in increasing order of their atomic mass was not successful with heavier elements..

Question: One of the best solutions to get rid of non-biodegradable wastes is _________________. 1. burning 2. dumping 3. burying 4. recycling Answer: ..

Question: Hiccups can be best described as ___________. 1. forceful sudden expiration 2. jerky incomplete inspiration 3. vibration of the soft palate during breathing while sleeping 4. sign of somebody remembering you Answer: ..

Question: Sneezing can be best described as __________. 1. forceful sudden expiration 2. jerky incomplete inspiration 3. vibration of the soft palate during breathing while sleeping 4. something you should never do when someone is going out Answer: ..

They are faecal pellets that contain evidences of the food eaten. For example, teeth and scales. The oldest fossil-bearing rocks contain fossils of few organisms that were simple. However, the younger rocks contain more fossils and these fossils show more complex structure indicating that the comp..

Food contains various organic and inorganic substances. Those which are required by the organisms to carry out life functions are called nutrients. Nutrients are of various types - carbohydrates, fats, proteins, vitamins and minerals. energy production synthesis of materials for growth and repa..

. However it begins to corrode when the pH in the mouth is below 5.5. How does the pH in the mouth get lowered? The bacteria present in the mouth act on sugar and food particles remaining in the mouth after eating to produce acids. The best way to prevent this is to clean the mouth after ..

It is present in abundance They have no moving parts and hence require little maintenance and work quite satisfactorily without any focusing device It does not cause any environmental pollution like the fossil fuels and nuclear power Solar cells last a longer time and have low running costs ..