A Laboratory Manual in Practical Botany
A Laboratory Manual in Practical Botany
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In our eReader you can find the full English version of the book. Read A Laboratory Manual in 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 A Laboratory Manual in Practical Botany
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9. Study the archegonium. This also may be recog- nized by the naked eye or magnifying glass as an ovoid brown, green, or black body situated in the axils of the leaflets or bracts. (Fig. 60, A. ) Find archegonia in dif- ferent stages of development. Under high power notice the spiral cells that envelop the egg cell. Focus below the spiral cells on a young archegonium and make out all you can of the egg cell. Notice the crown of cells at the apex of the archegonium. If possible, examine the cro...wn 110 PRACTICAL BOTANY.
in both Chara and Nitella and state how many cells com- pose it in each. When the egg cells are ready for fer- tilization, antherozoids, which have been set free in the water by the ripening of the antheridium, swim to the crown, find passage down through a central opening be- tween its cells, enter, and fertilize the egg. The egg now matures, protected by its covering of cells. In time the archegonium drops off from the mother plant, sinks to the bottom in situ, or is carried by currents to other localities.
What to read after A Laboratory Manual in Practical Botany?
You can find similar books in the "Read Also" column, or choose other free books by Charles H Charles Herbert Clark to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
9. Study the archegonium. This also may be recog- nized by the naked eye or magnifying glass as an ovoid brown, green, or black body situated in the axils of the leaflets or bracts. (Fig. 60, A. ) Find archegonia in dif- ferent stages of development. Under high power notice the spiral cells that envelop the egg cell. Focus below the spiral cells on a young archegonium and make out all you can of the egg cell. Notice the crown of cells at the apex of the archegonium. If possible, examine the cro...wn 110 PRACTICAL BOTANY.
in both Chara and Nitella and state how many cells com- pose it in each. When the egg cells are ready for fer- tilization, antherozoids, which have been set free in the water by the ripening of the antheridium, swim to the crown, find passage down through a central opening be- tween its cells, enter, and fertilize the egg. The egg now matures, protected by its covering of cells. In time the archegonium drops off from the mother plant, sinks to the bottom in situ, or is carried by currents to other localities.
What to read after A Laboratory Manual in Practical Botany?
You can find similar books in the "Read Also" column, or choose other free books by Charles H Charles Herbert Clark to read onlineMoreLess
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