Laboratory Exercises in Botany
Laboratory Exercises in Botany
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rior of the leaf, since air can circulate freely through the inter- cellular spaces. The importance of this fact to the functions already mentioned will readily be understood.
But while there is this free communication between the interior and the exterior through the stomata, the walls of the epidermal cells are all highly impermeable to water, for the epidermis, as would be found by testing it, is strongly cutiuized, and cutin is of all vegetable substances one of the least permeable to water.... The function of cutinized epidermis in preventing excessive evap- oration is strikingly shown in the case of the leaf of the common Live-for-ever and in that of Bryophyllum. If a leaf of either be plucked and exposed to the sun and dry air even for a con- siderable time, it scarcely shows signs of withering ; but if the epidermis first be stripped off, the leaf will shrivel and dry in the course of a few minutes.
(3) Mechanism of the Opening and Closing of the Stomaio. The movements of the guard-cells by means of which the aper- ture between them is enlarged or contracted are effected by means of their hygroscopism that is, by their power to take up moist- ure from the air about them and to part with it.
What to read after Laboratory Exercises in Botany?
You can find similar books in the "Read Also" column, or choose other free books by Edson S Edson Sewell Bastin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
rior of the leaf, since air can circulate freely through the inter- cellular spaces. The importance of this fact to the functions already mentioned will readily be understood.
But while there is this free communication between the interior and the exterior through the stomata, the walls of the epidermal cells are all highly impermeable to water, for the epidermis, as would be found by testing it, is strongly cutiuized, and cutin is of all vegetable substances one of the least permeable to water.... The function of cutinized epidermis in preventing excessive evap- oration is strikingly shown in the case of the leaf of the common Live-for-ever and in that of Bryophyllum. If a leaf of either be plucked and exposed to the sun and dry air even for a con- siderable time, it scarcely shows signs of withering ; but if the epidermis first be stripped off, the leaf will shrivel and dry in the course of a few minutes.
(3) Mechanism of the Opening and Closing of the Stomaio. The movements of the guard-cells by means of which the aper- ture between them is enlarged or contracted are effected by means of their hygroscopism that is, by their power to take up moist- ure from the air about them and to part with it.
What to read after Laboratory Exercises in Botany?
You can find similar books in the "Read Also" column, or choose other free books by Edson S Edson Sewell Bastin to read onlineMoreLess
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