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Cell Theory
The invention of the compound microscope in the 17th century stimulated the interest in living things not visible to the naked eyes. Thus, Robert Hooke discovered 'cells' in 1665 by examining cork slices (,under a crude microscope. He was actually describing the spaces occupied by the cells limited by the cellulose walls. Hooke and his contemporaries also described cells from other plants and animals.
Figure: A generalized plant (a) and animal (b) cell. No one cell of either plant (a) or animal (b) has all the characteristics shorn in these composite figures. Both these are
However, cell theory, one of the greatest and most basic generalizations of biology, was formulated only about 200 years later. Two German investigators, Schleiden a botanist (1838), and Schwann, a zoologist (1839) are credited with presenting independently the first concise, yet comprehensive, statements about the cell. They pointed out that, "All plants and. animals are made up of small fundamental units called cells and that some organisms are unicellular and others, multicellular." Subsequent researched to the expansion of this concept by including further information on cells. We know that cells are surrounded by cell membrane and contain cytoplasm and nucleus and, most importantly, cells divide into roughly equal daughter cells by a process called cell division. Thus it became known that new cells come into existence only by the division of previously existing cells. In other words, cells do not arise by spontaneous generation from nonliving matter. It follows that all cells living today can trace their ancestry back to those which existed in ancient times.
Kyasanur forest disease Kyasanur forest disease (KFD) was first recognized in 1957 as a new disease entity affecting man and monkeys in Karnataka, India. The disease is named
Explain the Most Probable Number (MPN) Techniques? Different procedures and media may be used depending on the food tested and the information sought. Media which can be used i
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Soil Temperature Soil temperature is known to influence water absorption and ultimately transpiration to a considerable extent. In many plants water absorption is reduced shar
Matter - Living and Non-Living Our universe is made up of two basic components:, matter and. energy. Matter, as you know, has mass; it occupies space. You can touch matter. It
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what is the chemical reaction of respiration in cockroach?
Ask questiImagine you are studying a group of amphibian species that vary in their habitats-some living in dense, murky water, and others living in very clear ponds. What kind of c
Q. What are the major events of the first mitotic period? The first mitotic period is the prophase. During prophase the following events occur migration of each centriole pair
what is cranium
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