Practical Botany
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In our eReader you can find the full English version of the book. Read Practical Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Practical Botany
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IX. HAPTOTROPISM (CONTACT IRRITABILITY) OF STA- MENS AND STIGMAS.
357. Stamens of Berberis. Examine flowers of Bar- berry, and note that there are several series of perianth leaves, arranged in whorls of three. The inner six petals have a nectary at their base ; each of the six stamens is slightly attached at the base to one of these six petals. The anthers open by two lateral valves near the top of the anther.
In the open flower, the stamens and petals are spread MOVEMENT IN PLANTS. 253 out, t...he anther of each stamen lying within the concave upper portion of one of the petals. If the filament is irritated it moves inwards, bringing the anther close to the stigma. When a bee pokes its proboscis into the flower, to reach the nectary at the base of each petal, the stamen moves inwards, dusting the bee's head with the pollen.
(a) Touch or stroke, with a mounted needle, different parts of the stamen, and note that the anther is not sensitive. Localise the sensitive region, by touching or stroking different parts of the outer and the inner surfaces of the filament in different stamens.
What to read after Practical Botany?
You can find similar books in the "Read Also" column, or choose other free books by F Cavers to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
IX. HAPTOTROPISM (CONTACT IRRITABILITY) OF STA- MENS AND STIGMAS.
357. Stamens of Berberis. Examine flowers of Bar- berry, and note that there are several series of perianth leaves, arranged in whorls of three. The inner six petals have a nectary at their base ; each of the six stamens is slightly attached at the base to one of these six petals. The anthers open by two lateral valves near the top of the anther.
In the open flower, the stamens and petals are spread MOVEMENT IN PLANTS. 253 out, t...he anther of each stamen lying within the concave upper portion of one of the petals. If the filament is irritated it moves inwards, bringing the anther close to the stigma. When a bee pokes its proboscis into the flower, to reach the nectary at the base of each petal, the stamen moves inwards, dusting the bee's head with the pollen.
(a) Touch or stroke, with a mounted needle, different parts of the stamen, and note that the anther is not sensitive. Localise the sensitive region, by touching or stroking different parts of the outer and the inner surfaces of the filament in different stamens.
What to read after Practical Botany?
You can find similar books in the "Read Also" column, or choose other free books by F Cavers to read onlineMoreLess
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