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PleaseHelpMe9428
02.02.2021 •
Biology
What is the weigh of the air that is pressing down on us at sea level, in pounds per square inch ?
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Ответ:
Así como el agua del mar tiene un peso que actúa sobre los seres que lo habitan, también lo tiene el océano de aire que hay por encima de nosotros. Cargamos sobre nuestras espaldas casi una tonelada de aire, pero no lo notamos porque nos sostiene en pie una presión atmosférica equivalente, que se ejerce en todas direcciones.
La presión media del aire al nivel del mar es de 1.03 kilogramos por centímetro cuadrado. Esta presión disminuye rápidamente al aumentar la altura: a 3,000 metros se reduce a unos 0.7 kilogramos por centímetro cuadrado y a 8,800 metros, la altura del monte Everest, la presión es sólo de 0.316 kilogramos por centímetro cuadrado. (El aire es tan tenue en estas altitudes que los alpinistas tienen que llevar suministro de oxígeno.
Explanation:
Ответ:
Option D, Phloem
Explanation:
Phloem consists of following parts -
a) Sieve tubes
b) Companion cells
c) Phloem fibers
d) Phloem parenchyma cells
Protophloem and metaphloem matures before and after cell elongation respectively. However, As a plant ages , the sieve tubes of protophloem get destroyed as a plant ages while the remaining cells in the phloem converts into fibers. These fibres and later maturing metaphloem appear as tissue with in the bark of the tree.
Hence, option D is correct