Читать книгу A Guide for the Study of Animals - Worrallo Whitney - Страница 17

Notice the general worm-like form of the maggot, or grub, the plain and uniform color, and the absence of all elaborate structures, as wings and feelers.

1 Since this creature is destined to become a flying or walking insect, what organs will have to appear? Is there any indication of these structures at present?

2 Give the color of the specimen, and explain how the presence or absence of strong light seems to have affected the color. Is this effect usual in animals or plants that you know?

3 Tell how the animal gets from place to place, describing any special structures you find which aid in this work.

4 How can you tell the head end? Tell how the amount of work that the mouth and mouth parts do affects their size and indirectly that of the region where they are.

5 What senses and sense organs has the maggot? Test any of these senses or organs gently, by any means at your disposal, or recall any experience you have had along this line. Which senses or organs seem to be best developed?

6 Explain briefly how the active or sluggish habits either determine or are determined by the condition of the senses or sense organs.

7 Since "Mother Nature" seems to want maggots to develop rapidly, tell how she economizes in energy and material when forming them.

8 Show how the development of maggots in refuse matter is actually beneficial.

9 From the standpoint of flies and human welfare, show why maggots should not be allowed to live—stating how they may be prevented.

10  Look up the story of the pupa of the house fly; the development and work of the botfly; of the ox-warble; of the tsetse fly.