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

By W. B. Crow (Auth.)

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Grafting is not possible in grasses, lilies, palms, and other mono­ cotyledons because these plants lack the continuous growing layer (cambium) ; the other cells are much differentiated. , skin- and bone-grafts in surgery. Animal tissues, especially the connective and epithelial, retain a certain degree of embryonic vitality. EQUAL FISSION The normal method of reproduction of bacteria, many small algae, many protozoa, such as Amceba, where division into two equal parts ( b i n a r y fission) occurs as the usual method of reproduction.

Unlike the preceding there is no free male cell, b u t the nucleus of the male cell ( a n t h e r i d i u m ) passes to t h a t of the female, continuity of cytoplasm having first been established (through the trichogyne if present). REDUCED SEXUALITY Occurs in many fungi; P s e u d o g a m y (fusion between a gamete and a non-related vegetative cell of the same individual, or even of two vegetative cells). A u t o g a m y (fusion of sister gamete cells) also occurs in Actinophrys and Actinosphcsrium among the Heliozoa ; a cell encysts, divides, then meiosis occurs in the products and the resulting cells fuse.

Snails, seek other individuals for mating. None of the above distinctions is absolute. , whereas many hydroids and bryozoa form plant-like expanses. Some mollusc shells show successive years' growth. Chlamydomonas again shows movement, although plant-like in nutrition. Pitcher plants show internal digestion in their pitchers, comparable with t h a t in an animal stomach. , fungi and other parasites and saprophytes. , require organic nutriment. Some plants are distinct male or female. Most puzzling are the so-called slime-fungi (Myxomycetes, Mycetozoa) which are quite animal-like a t one stage in their life-cycle, plant­ like in the other.

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