I n 1827, a London physician with an interest in caterpillar metamorphosis built small glass boxes to contain the cocoons and emerging butterflies. Peering into the “dirt” in one of the boxes one day, ...

Plants are divided into broad categories in terms of their mode of nutrition. The first category consists of green plants which make their own food by the common process called photosynthesis. Such ...

In 1827, a London physician with an interest in caterpillar metamorphosis built small glass boxes to contain the cocoons and emerging butterflies. Peering into the "dirt" in one of the boxes one day, ...