Normally the bark of trees turn brown but i some the
stem remains green even after a few years. Why?                  22
Why do plants and trees have different colours and
attractive patterns / flowers on them?                           23
Animals have a point of clinical death. Do plants, and 
if they do, how is it determined?                                24
Do plants, like human beings, feel pain?                         25
How is water formed inside coconut and what is its
composition?                                                     26
Why do brinjals and apples become dark when they are
kept open after cutting?                                         27
What is the difference in energy content of raw
and boiled rice?                                                 29
What is freshness in fruits and vegetables? How does
refrigeration play a role in maintaining the freshness?          
If so, is not the shrinkage due to dehydration, a 
measure of loss of freshness?                                    29
How do fruits acquire sweetness?                                 30
Why does turmeric powder turn red in colour when
mixed with slaked lime?                                          31