United States or Christmas Island ? Vote for the TOP Country of the Week !
But in point of fact, as studies of a later generation were to show, it is the under surface of the leaf that is most abundantly provided with stomata, or "breathing-pores." From the stand-point of this later knowledge, it is of interest to follow our author a little farther, to illustrate yet more fully the possibility of combining correct observations with a faulty inference.
It's the spirilloe of a water plant. Move on to the next." Tom, in much perturbation of mind, shuffled down the line and looked through the next brazen tube. "This is a preparation of stomata," he said, recognizing it from a print in his book on botany. The professor shook his head despondingly. "You are right," he said; "pass on to the next."
It has, therefore, long been known that carbonic acid gas is given off at night. The amount, however, is so small that it could not injure the air of the room, as is popularly supposed. Respiration takes place principally through the stomata of the leaves.
Although this peculiarity of the structure of stomata is also found in plants of widely distant orders, it is, on the whole, but rarely met with, and being thus observed to characterise a foliage previously suspected to be proteaceous, it adds to the probability that the botanical evidence had been correctly interpreted.
A continual and increasing demand for refreshment existing during the day, the root spongioles are in active operation intercepting the moisture in its descent and absorbing it, while with the lessening of the temperature on the going down of the sun reaction begins, the stomata of the leaves exercise their functions, and by the absorption of gas react on the root films, which for the time relax their duty of arresting the passage of minute particles of water, with a very definite result on the nocturnal flow.
Large and vigorous appeared the bugs, all gleaming in green and gold, like the wolf on the fold, and stopped up all the stomata and ate up all the parenchyma, till my squash-leaves looked as if they had grown for the sole purpose of illustrating net-veined organizations. In consternation I sought again my neighbor the Englishman. He assured me he had 'em on his, too, lots of 'em.
Through the stomata, when open, free interchange may take place between the external air and that within the leaf, and thus transpiration be much facilitated. When closed, this interchange will be interrupted or impeded." In these lessons, however, it is not desirable to enter upon subjects involving the use of the compound microscope. Dr.
For a teacher to endeavor to explain the complex structure of the leaf, without having seen it for himself, is open to the same objection which could be urged against the attempted explanation of complicated machinery by one who has never seen it, but has heard about it. What is here said with regard to stomata applies to all the more recondite matters connected with plant structure."
Lawes, of Rothampsted, has been making on the growth of grasses and leguminous plants in different soils and under different manures the usual answer, I say, would be Because we plants want such and such mineral constituents in our woody fibre; again, because we want a certain amount of moisture at a certain period of the year: or, perhaps, simply because the mechanical arrangement of the particles of a certain soil happens to suit the shape of our roots and of their stomata.
The frond grows from a flat disc-shaped gemma, the two sides of which are alike. Either side may fall uppermost; and then of the developing shoot, the side exposed to the light "is under all circumstances the upper side which forms stomata, the dark side becomes the under side which produces root-hairs and leafy processes."
Word Of The Day