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by Suchitha Vishwa


A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

Video Overview

  1. Take an A4 size paper
    • Take an A4 size paper

    • Fold the paper into half

    • Then fold one of the corners to the edge of the opposite side of the paper to create a right-angled triangle plus a rectangular strip below

  2. Cut off this extra rectangular strip
    • Cut off this extra rectangular strip

    • Unfold the right-angled triangle and notice a rectangle made up of 2 squares; i.e. length:breadth is 2:1

    • Again fold both the edges along the mid line to get a long doubled up rectangular strip.

    • Fold the strip in half to get the halfway line

    • Fold the edges to the halfway line to get the quarter lines

    • Fold the edges to the quarter line to get the 1/8th lines on both the sides

    • Take one edge and crease it to one fold to get 1/8th on the other side of the half. Repeat with the other edge.

    • Strip will be divided into 8 equal parts

    • Fold the paper in the middle leaving the open line outside

    • Draw a rhombus at the centre and 2 diagonals joining 4 corners

    • Repeat the same on the other side of the fold.

    • Tear one eighth of the strip off

    • Now sharply crease all the 10 slant lines with the help of a ruler

    • Tuck one section of one end into the other end to make a prism

    • Your prism is ready

    • Fold half diamonds on all sides to the inside

    • Fold 3 diamond-shaped petals to the inside on the top and bottom

    • Flexagon is ready to flex!

    • The folds and creases need to be neat and precise throughout

    • How many triangles are visible and what type of triangles are they?

    • Can you make a bigger model?

    • Observe if the direction of pictures are appearing in the same direction while continuously flexing for a long time

    • Can you make a flexagon with 3:1 or 4:1 ratio of sides?

    • The Food chain we selected here is , Plant-> deer -> Lion. Finally dead and decay are eaten by earthworm

    • Take 3 copies of pictures Plant, Deer, Lion and Earthworm as shown in the pciture

    • Cut the pictures separately and paste three same pictures on each face of flexagon and start flexing

    • Try to understand different food chains in nature

    • Think of a Food chain in water

    • What happens if food chain breaks or one animal in the chain becomes extinct

    • Think of a food web in a nature

Finish Line

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