The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 916
... plants , whence the echinoids derive them . The conspicuous anthraquinones described above doubt- less are acquired by the insects from their plant hosts , but no information is yet available as to the manner in which the compounds are ...
... plants , whence the echinoids derive them . The conspicuous anthraquinones described above doubt- less are acquired by the insects from their plant hosts , but no information is yet available as to the manner in which the compounds are ...
Page 917
... plants is often useful in the diagnosis of mineral defi- ciencies in the plant nutrient supply . This is particularly true for phosphorus , potassium , magnesium , and boron deficiencies . Insufficient phosphorus induces a pro- nounced ...
... plants is often useful in the diagnosis of mineral defi- ciencies in the plant nutrient supply . This is particularly true for phosphorus , potassium , magnesium , and boron deficiencies . Insufficient phosphorus induces a pro- nounced ...
Page 1028
... plants , but similar categories can be defined for animals and aquatic communities . Vertical and horizontal patterns . Growth forms and life - forms relate to stratification - a general character- istic of communities . Plant ...
... plants , but similar categories can be defined for animals and aquatic communities . Vertical and horizontal patterns . Growth forms and life - forms relate to stratification - a general character- istic of communities . Plant ...
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acid activity addition administration appear atoms became become bonds called carbon cause central centre century charge Charles chemical chemistry Chess China Chinese combined common complete compounds containing continued cultural drugs early economic effect electrons elements energy established example Figure forces four give given groups hydrogen important increased industry involved ions Italy king known land later less literature living major mass materials ment metal methods molecular molecules move natural occur officials orbitals organic original party percent period play political population position possible present properties provinces reaction region remained represented result river rule separation social species structure substances successful temperature tion types United usually various