Biology
Explain the following terms:
(i) Greenhouse effect.
(ii) Turgor pressure.
(iii) Selective reabsorption.
(iv) Natality.
(v) Pulse.
Roots Absorption
ICSE 2015
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Answer
(i) The phenomenon by which certain gases specially CO2 and methane (CH4) accumulating in the atmosphere prevent the escape of heat, thereby warming the earth’s surface is known as Greenhouse effect.
(ii) The pressure of the cell contents on the cell wall is called Turgor pressure.
(iii) The glomerular filtrate entering the renal tubule is an extremely dilute solution containing a lot of useful materials such as glucose and some salts such as those of sodium. As this filtrate passes down the renal tubule, a lot of water along with these usable materials is reabsorbed. But their reabsorption is only to the extent that the normal concentration of the blood is not disturbed. This is called Selective Absorption.
(iv) Natality is the number of live births per thousand people per year.
(v) Pulse is the alternate expansion and elastic recoil of the wall of the artery during ventricular systole.
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