Elements of Biology: A Practical Text-book Correlating Botany, Zoology, and Human PhysiologyAmerican Book Company, 1907 - 445 páginas |
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Página 32
... germinate , a long threadlike mass of proto- plasm growing from it into the sugar solution . The presence of this ... germinates , one of the nuclei enters the threadlike growth ( this growth is called the pollen tube ; see figure ) ...
... germinate , a long threadlike mass of proto- plasm growing from it into the sugar solution . The presence of this ... germinates , one of the nuclei enters the threadlike growth ( this growth is called the pollen tube ; see figure ) ...
Página 33
... germinate . The cen- tral part of the style is found to be either hollow or composed of a soft tissue through which the pollen tube can easily grow . Upon germina- tion , the pollen tube grows downward through the spongy center of the ...
... germinate . The cen- tral part of the style is found to be either hollow or composed of a soft tissue through which the pollen tube can easily grow . Upon germina- tion , the pollen tube grows downward through the spongy center of the ...
Página 35
... germinates before the pollen which has fallen from the anthers of the same flower . This latter fact alone in most cases renders it impossible for a flower to produce seeds by its own pollen . Darwin worked for many years on the ...
... germinates before the pollen which has fallen from the anthers of the same flower . This latter fact alone in most cases renders it impossible for a flower to produce seeds by its own pollen . Darwin worked for many years on the ...
Página 61
... germinate . Wild geranium ( crane's bill ) , showing method of seed dispersal ; a , flower with seeds nearly ripe ; b , flower with seeds ripe ; c , flower after having thrown seeds . ( After Lubbock . ) The Struggle for Existence ...
... germinate . Wild geranium ( crane's bill ) , showing method of seed dispersal ; a , flower with seeds nearly ripe ; b , flower with seeds ripe ; c , flower after having thrown seeds . ( After Lubbock . ) The Struggle for Existence ...
Página 66
... germinate and produce new plants like the original plant from which they grew . Study of a Bean.- Let us now take up the careful study of a bean in order better to understand how the seed may produce a young plant . For this purpose we ...
... germinate and produce new plants like the original plant from which they grew . Study of a Bean.- Let us now take up the careful study of a bean in order better to understand how the seed may produce a young plant . For this purpose we ...
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adapted alcohol American Book Company amount animal arteries bacteria bean beetle birds blood vessels bone Botany breathing called carbon dioxide cause cells cerebrum color colorless corpuscles containing corn corpuscles cotyledons covered crayfish developed dicotyledonous digestive eggs endosperm example experiment fibers fish flower fluid frog fruit germinate gills glands grain green grow growth heart heat Hunter and Valentine insects intestine kidney known laboratory large number larvæ layer leaf leaves legs living lungs Manual means membrane microscope mollusks monocotyledon mouth muscles muscular nerve nervous system nitrogen Notice organs outer ovary oxidation oxygen parasitic pass Physiology pistil pollen proteid protoplasm root hairs seedlings seeds seen shell side skeleton skin soil species sporangium spores stamens starch stem stomach stomata structure substance sugar surface teeth temperature tiny tion tissues tree veins vertebral vertebral column walls wings worm Zoology