Beginners' zoology . 63. 64 BEGINNERS ZOOLOGY The Abdomen. — About how many segments or rings inthe abdomen? Do all grasshoppers have the same num-ber of rings ? (Answer for different species and differentindividuals of the same species.) The first segment andthe last two arc incomplete rings. Docs the flexibility ofthe abdomen reside in the rings orin the joints between therings ? Is there merely a thin, soft line between the rings,or is there a fold of the covering ? Does one ring slip intothe ring before it or behind it when the abdomen is bent ?As the grasshopper breathes, docs each ring e
Beginners' zoology . 63. 64 BEGINNERS ZOOLOGY The Abdomen. — About how many segments or rings inthe abdomen? Do all grasshoppers have the same num-ber of rings ? (Answer for different species and differentindividuals of the same species.) The first segment andthe last two arc incomplete rings. Docs the flexibility ofthe abdomen reside in the rings orin the joints between therings ? Is there merely a thin, soft line between the rings,or is there a fold of the covering ? Does one ring slip intothe ring before it or behind it when the abdomen is bent ?As the grasshopper breathes, docs each ring enlargeand diminish in size ? Each ?-ing- is divided into two parts by folds. Does the upper half-ringoverlap the lower half-ring, or thereverse } With magnifying glass, finda small slit, called a spiracle, or breath-ing hole, on each side of each ring justabove the side groove (Fig. io6). Atube leads from each spiracle. Whilethe air is being taken in, do the twoportions of the rings move fartherapart} When they are bro
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
