Elements of Biology: A Practical Text-book Correlating Botany, Zoology, and Human PhysiologyAmerican Book Company, 1907 - 445 páginas |
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Página 31
... pistils ) . The latter are in the center of the flower . The structures with the knobbed ends are called stamens ... pistil is composed of a rather stout base called the ovary , and a more or less lengthened portion rising from the ...
... pistils ) . The latter are in the center of the flower . The structures with the knobbed ends are called stamens ... pistil is composed of a rather stout base called the ovary , and a more or less lengthened portion rising from the ...
Página 32
... Pistil . - Let us now examine the structure of the pistil more in detail . ( Use for this purpose any large lily . ) Cut the pistil length- 1 Laboratory directions for other work on flowers may be found in Hunter and Valentine . Manual ...
... Pistil . - Let us now examine the structure of the pistil more in detail . ( Use for this purpose any large lily . ) Cut the pistil length- 1 Laboratory directions for other work on flowers may be found in Hunter and Valentine . Manual ...
Página 33
... pistil , on which pollen has begun to 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 ...
... pistil , on which pollen has begun to 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 ...
Página 36
... pistil . Draw and label them . Notice the little hairs covering parts of the pistil ; can you imagine their use ? In old flowers you can see that the ovary is forming the characteristic pod of the pea family . Insects as Pollinating ...
... pistil . Draw and label them . Notice the little hairs covering parts of the pistil ; can you imagine their use ? In old flowers you can see that the ovary is forming the characteristic pod of the pea family . Insects as Pollinating ...
Página 38
... pistil ( stigma ) . Nectar and Nectar Glands . Insects can , as we have already learned , distinguish differences in color at some distance , but they do not seem to be able to make out form at any distance . To make up for this , they ...
... pistil ( stigma ) . Nectar and Nectar Glands . Insects can , as we have already learned , distinguish differences in color at some distance , but they do not seem to be able to make out form at any distance . To make up for this , they ...
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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