noun
definition
An organelle found in the cells of green plants, and in photosynthetic algae, where photosynthesis takes place.
Examples of chloroplasts in a Sentence
Chloroplasts are very sensitive to light and are capable in.
The electrons in cells called chloroplasts are excited by sunlight.
The origin of these areas that lack functional green chloroplasts is in primordial tissue.
The presence of too much sugar in solution in the sap of the cell inhibits the activity of the chloroplasts; hence the necessity for its removal.
Envelope membranes from spinach chloroplasts are a site of metabolism of fatty acid hydroperoxides.
Chloroplasts are made up of stacks of thylakoid disks; a stack of thylakoid disks; a stack of thylakoid disks is called a granum.
As the cell grows they may become converted into leucoplasts (starch-formers), chloroplasts (chlorophyllbodies), or chromoplasts (color-bodies).
This stage takes place in the stroma of the chloroplasts and involve the fixation of carbon dioxide and the synthesis of glucose.
They arise either from the leucoplasts or chloroplasts.
Within these tissues, there are small particles called chloroplasts which contain pigments, including the green pigment chlorophyll.
The Marchantiaceae (see article BRYOPHYTA) show considerable tissue-differentiation, possessing a distinct assimilative system of cells, consisting of branched cell threads packed with chloroplasts and arising from the basal cells of large cavities in the upper part of the thallus.
Chloroplasts are made up of stacks of thylakoid disks; a stack of thylakoid disks is called a granum.
It is highly probable that starch is only produced as the result of the activity of chromatophores, either in connection with chromoplasts, chloroplasts or leucoplasts.
The chloroplasts are generally distinguished by their green color, which is due to the presence of chlorophyll; but in many Algae this is masked by another coloring matterPh ycoerytlsrin in the Florideae, Phycophaein in the Phaeophyceae, and Phycocyanin in the Cyanophyceae.
The chloroplasts increase in number by division., which takes place in higher plants when they have attained a certain size, independent of the division.
The main assimilating tissue, on the other hand, is under the upper epidermis, where it is well illuminated, and consists of oblong cells densely packed with chloroplasts and with their long axes perpendicular to the surface (palisade tissue).
In some cases both the nucleus and the chromatophores may be carried along in the rotating stream, but in others, such as T.Titeila, the chloroplasts may remain motionless iii a non-motile layer of the cytoplasm in direct contact with the cell wall.i Desmids, Diatoms and Oscillaria show creeping movements probably due to the secretion of slime by the cells; the swarmspores and plasmodium of the Myxomycetes exhibit amoehoid movements; and the motile spores of Fungi and Algae, the spermatozoids of mosses, ferns, &c., move by means of delicate prolongations, cilia or flagella cf the protoplast.