Download Adamson Nucleus Biology (NUCL) by D Adamson, Marston Bates PDF

By D Adamson, Marston Bates

ISBN-10: 0582513022

ISBN-13: 9780582513020

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Similarly. if the tem perature becomes too low. cells may be damaged by the form at ion of ice crystals in them. In hum an nutri tio n. it has been sho wn that bone malformation can be ca used not only by insufficient vitamin D. but also by too much of it. Certa in other vitamins may be harmful if ta ken in excessive qu antities. and too much iron may da mage the liver. The clea rest exa mple of excess in nutri tion is over-eating. which leads to overweight a nd obesity. a nd may result in hea rt di sease.

By means or this process the plant must produoe eno ugh carbohydrate to provide energy for chemical reactions within the cell and to build new cell ular material. In addition to these factors, a plant must obtain an adequate amount o f so luble salts containing the clemen ts so dium. sulphur. magnesium. iron. calcium. potassium and nitrogen. A lack of nitro- gen in the soil slows down growth and causes chlorosis or yellowing in the older leaves. Th is is becau se the chlorophyll-cont aining cells arc destroyed as the prote in is bro ken down.

Chlorosis may occ ur. A wa rm clima te favours the gro wth of plants. bu t there is a ma ximum tem pe rat u re beyond which growth sto ps. Similarly. if the tem perature becomes too low. cells may be damaged by the form at ion of ice crystals in them. In hum an nutri tio n. it has been sho wn that bone malformation can be ca used not only by insufficient vitamin D. but also by too much of it. Certa in other vitamins may be harmful if ta ken in excessive qu antities. and too much iron may da mage the liver.

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