The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 242
The primitive fern leaf plan Leaf position Plant hairs on fern leaves Types of spore- producing structures. roots also arise in the leaf gap , usually at its base . Thus , each leaf as a rule has its own associated root system . The root ...
The primitive fern leaf plan Leaf position Plant hairs on fern leaves Types of spore- producing structures. roots also arise in the leaf gap , usually at its base . Thus , each leaf as a rule has its own associated root system . The root ...
Page 243
... leaves have only one or two strands ; large leaves have many . Just as in stems , this size factor plays a role in the number of strands observed . Petiolar vascular bun- dle shapes have been found to be so definitive as to have a ...
... leaves have only one or two strands ; large leaves have many . Just as in stems , this size factor plays a role in the number of strands observed . Petiolar vascular bun- dle shapes have been found to be so definitive as to have a ...
Page 246
... leaf arose from the elaboration of original , simple enations , or outgrowths , such as modern leaf primordia ) are the two most popular . The true story seems to be lost in anti- quity and perhaps will never be known . Modern fern leaves ...
... leaf arose from the elaboration of original , simple enations , or outgrowths , such as modern leaf primordia ) are the two most popular . The true story seems to be lost in anti- quity and perhaps will never be known . Modern fern leaves ...
Contents
would become the principal reserve asset while gold | 36 |
Excretion the elimination of the waste products of | 50 |
Volumes | 431 |
Copyright | |
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acid activity amount animals appears become blood body called carried cause cells century changes chemical close common complete consists containing continuous countries depends direction early effect evidence evolution example existence farm federal ferns fibres field Figure fire function gametophyte give groups important increase interest Italy kidney known later leaves less light lines living major marriage material means ment method move movements muscle natural normal obtained occur organs origin percent period person plants position possible present pressure problems produced properties protection reduced remain renal response result retina selection similar social species structure supply surface temperature tend tion types United urine usually various vary