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Explain the Discovery of Cell
Let us study here about the scientists who played a pioneer role in discovering the basic component of any living organism -the cell. Robert Hooke (1665) is credited with the discovery of cell. Hooke observed a honeycomb-like pattern in a very thin slice of cork as shown in the Figure. As you can see, this honeycomb-like structure consists of a thick wall, enclosing box-like compartments for which he coined the term cellulae for the first time and this term is synonymous to what we call as cells. He regarded cellulae as passages for conducting fluids.
Antony Van Leeuwenhoek, on the other hand, was the first to observe free cells. You may already be aware that these are single organisms.
Explain the Orthopnoea and Tachypnoea Orthopnoea: Dyspnoea occurs even at rest in severe cardiac congestive failure. This condition is called orthopnoea. Tachypnoea: It is a
Ingestion : The standard treatment for this type of poisoning is as follows: (1) Tell the casualty to spit out as much of the material as possible and then wash the mouth thoro
Dating the Past: Today, that a particular rock is a million ycars old, or a fossil is 50 thousand ycars old. For instance, how do we estimate the duration of various geo
Let us summarise the important points that we have understood about the radiation and chemical hazards in this unit. The radiations, causing severe hazards like cancers, mutations,
What is ethics
Define Nerve Cell The basic unit of the nervous system as studied above, is the individual nerve cell - the neuron. The nerve cells operate by generating electrical signals and
To show the impact of a raindrop on soil Place a saucer or jar lid filled with soil on a piece of white paper. Fill a medicine dropper with water and hold it about a metre abov
Digital X-Ray, Inc., has introduced a new line of equipment that may revolutionize the medical profession. Because of the new technology involved, potential users of the equipment
A bottle barometer A bottle, partially filled with water, is overturned with its neck under the surface of more water in a saucer. This is the device used as a chicken feeder,
Vitamin E (Tocopherols) Vitamin E is an essential fat-soluble vitamin that functions, at least in part, as a lipid- soluble antioxidant. Presence of vitamin E was first revea
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