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Question 4: Name the quantity whose one of the units is pascal (Pa).

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Answer: Pascal (Pa) is one of the units of pressure.
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1 Gell INTRODUCTION A cell is the structural and functional unit of life. That is to say, it is the building block of which all living organisms are made, and the smallest unit of life capable of all the living functions. It is defined as a mass of protoplasm bounded by a plasma membrane. Cells vary in size. Most cells are very small (microscopic), some may be very large (macroscopic). They vary considerably in shape. Variation depends mainly upon the functions of cells. For example, a nerve cell has a cell body with long cell processes extending from it. Its function is to receive and transmit nervous signals. Some cells may exist as independent units of life. Some such cells like Euglena and Amoeba can change their shape, but most cells have a fixed shape. The number of Honeycomb-ike cells Fig. 1.1 Cells as seen by Robert Hooke cells vary from organism to organism. An Amoeba is single-celled, while a human body weighing about may have as many as cells. In unicellular organisms, e.g., Amoeba, Paramoecium or Chlamydomonas, all the basic functions of a living being are performed in one cell, while multicellular organisms have well-developed division of labour. So, their different functions are performed by different organs. For example, we have a stomach to digest food, a heart to pump blood and a brain to think. An English scientist, Robert Hooke, discovered the cell in 1665 while examining thin sections of cork under his simple microscope. He observed a mass of empty hexagonal chambers like a honeycomb and called them (compartments) cells. Cell is the Latin word for 'a little room'. Between 1838-39 Schleiden, a German botanist, and Schwann, a German zoologist, proved that plants and animals are cellular in character and founded the cell theory. They postulated that the cell is the basic unit of all life. Virchow, in 1855, proposed the idea that all cells arise from pre-existing cells. No cell can originate spontaneously, but comes into being only by the division of already existing cells. After the studies of plant and animal cells by De Bary and Schultze, the protoplasm theory was established in 1861. According to this theory, the cells, or units of plants and animals, are tiny masses of protoplasm, each containing a nucleus. In 1884, Strasburger concluded that the nucleus is related to inheritance of characters. After the discovery of different techniques and electron microscopes, our knowledge about the cell and its organelles has developed tremendously. Let us now look at different types of cells under a compound microscope. You may need your teacher's help in the activities described below. If possible, observe the cells at as well as or magnification. 1
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Question Text
Question 4: Name the quantity whose one of the units is pascal (Pa).
TopicGravitation
SubjectScience
ClassClass 9
Answer TypeText solution:1
Upvotes72