(D) The modification of the transcellular theory is known as cytoplasmic streaming. This concept was proposed by de Vries $(1885)$. According to this

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(D) The modification of the transcellular theory is known as cytoplasmic streaming. This concept was proposed by de Vries $(1885)$. According to this theory,the transport of food materials occurs through the streaming movement of the protoplasm within the cells.