A Synopsis of Biology by W. B. Crow (Auth.)

March 9, 2017 | Study Aids | By admin | 0 Comments

By W. B. Crow (Auth.)

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Usually only develop and only function in light, photosynthetic, usually small ellipsoidal or discoidal, numerous in each green cell ; large and complex, often few or one in cell in algae, there o O Fig. —Pettionia. Development of large starch grain from chloroplast. Only small grains of starch are usually formed in chloroplasts ; large grains like that shown usually only grow in leucoplasts. termed c h r o m a t o p h o r e s and may vary somewhat in pigmentation. Starch grains temporarily formed (Fig.

Almost any piece of a flatworm above a very small size will do likewise. These animals can remodel ; if the mouth end be removed it is regenerated, but as the animal is unable to feed during the process it gets smaller. Sea-cucumbers eject their viscera, sometimes completely losing them, after which they regenerate. Internal organs probably regenerate in many invertebrates and lower vertebrates. Gonads are replaced in crustaceans, but not in insects. Lungs of salamanders are regenerated if a small portion of their tissue be left.

Biennial and perennial plants store up food towards the end of the season for next year's growth. Food stores accumulated during a season are made available for or pass into new buds, which grow out as independent plants in the next season, whilst the parent plant dies away. We have seen t h a t creeping stems often fragment. Such may be renewed every year by buds in the leaf axils near the apex, as in pennywort (Lysimachia nummularia). In periwinkle (Vinca) and gromwell (Lithospermum) these ends swell.

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