Cristina Rossi Marco Fragiacomo THE WORLD OF MOTHS Istituto Tecnico Agrario Statale Giovanni Brignol - PowerPoint PPT Presentation

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Cristina Rossi Marco Fragiacomo THE WORLD OF MOTHS Istituto Tecnico Agrario Statale Giovanni Brignol

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THE WORLD OF MOTHS. Istituto Tecnico Agrario Statale 'Giovanni Brignoli' Gradisca d'Isonzo ... of caterpillar into a moth is a well known biological ... – PowerPoint PPT presentation

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Title: Cristina Rossi Marco Fragiacomo THE WORLD OF MOTHS Istituto Tecnico Agrario Statale Giovanni Brignol


1
Cristina Rossi Marco FragiacomoTHE WORLD
OF MOTHSIstituto Tecnico Agrario Statale
Giovanni BrignoliGradisca dIsonzo
  • METAMORPHOSIS OF A CECROPIA MOTH
  • From egg to moth

2
What do insects look like? Most insects undergo
a transformation of their bodies known as
metamorphosis. The metamorphosis of caterpillar
into a moth is a well known biological
phenomenon. However, a long ago it was considered
one of the most mysterious. Some experiments
have carefully investigated these changes.
3
FROM EGG TO PUPA
  • The following pictures show the process of
    metamorphosis in the life cycle of a cecropia
    moth.
  • An egg hatches after 10 days (picture 1). The
    caterpillar has turned green to match the natural
    environment.
  • The caterpillar grows enormously, splitting out
    of four skins in the process (picture 2).
  • Glands near the caterpillars mouth (picture 3)
    extrude liquid silk so that the caterpillar can
    spin the cocoon.
  • The developing pupa without its cocoon (pictures
    4, 5 and 6).

4
Picture 1
5
Picture 2
6
Picture 3
7
Pictures 4 5 6
8
Picture 7
9
FROM PUPA TO MOTH
  • The moth escapes from the dry skin of the pupa
    (picture 7). The skin begins to split at the head
    and the moth comes out. Then, using its legs, the
    moth pulls out its body free end exposes its
    folded wings. Blood expands the wings, so that
    the moth can fly.

10
Two research questions
  • 1. What causes this incredible change of body
    form and function?
  • 2. What mechanism controls its timing, so that
    the moth leaves its cocoon only in the warm
    weather of spring?
  • Pictures and text from
  • Farb P. The Editors of Life, The Insects
    Life Nature History, Time Life International
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