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By M. Abercrombie; C. J. Hickman; M. L. Johnson

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Lacking vascular tissue. Attached to substratum by rhizoids. Reproducing sexually by fusion of male and female gametes produced in multicellular sex organs: antheridia, liberating male gametes motile by flagella, and archegonia, containing a single egg. Sexual reproduction is followed by development of a capsule, containing spores, which give rise, directly or indirectly, to new liverwort or moss plants. ). The plant itself is the gametophyte generation, and the capsule is the sporophyte generation, nutritionally dependent on the gametophyte.

Outgrowth of anterior end of dorsal surface of hindbrain of vertebrates, varying from a mere transverse commissure in cyclostomes to a conspicuous part of the brain in birds and mammals (with a cortex of grey matter in mammals) Particularly concerned in co-ordination of complex muscular movements. cerebral cortex. ). cerebral hemispheres. Paired outpushings of front end of forebrain of vertebrates. In early vertebrates mainly concerned with sense of smell; but in amniotes general co-ordinating functions become predominant, and in mammals, hemispheres are largest part of brain, with a much folded cortex by which much of anrrnal's This host .

In termites the distinction between workers all sterile castes not related to sex (as is hive bees there are three castes, females, usually sterile;, drones workers fertile females^, males). 43 a type of structurally and functionally social insects, may be sterile males CATABOLISH (KATABOLISM). g. or females. Breaking down by living things of ^-ith liberation of energy. See I holism, Anabolism. catalase. Enzyme which breaks down the poisonous substance, hydrogen peroxide, formed during plant and animal metabolism, to water and oxygen.

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A Dictionary of Biology by M. Abercrombie; C. J. Hickman; M. L. Johnson


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