Plane & axis
Plane: A plane of symmetry is a plane that cuts a 3D figure into equal halves such
that the reflection of half of the object across the plane is the mirror image of the
other half.
Axis: The axis of symmetry is the axis around which the body preserves
its shape when rotated.
1. Plane of Symmetry:
a. In zoology, a "plane of symmetry" refers to an imaginary flat surface that
divides an organism or a body part into two approximately mirror-image
halves. This plane passes through the organism's body, dividing it into left
and right halves.
b. The plane of symmetry is a fundamental concept in describing the symmetry
of animals. It helps classify animals based on their symmetry characteristics.
c. For example, animals with bilateral symmetry have a single plane of
symmetry dividing them into two similar halves, such as humans, butterflies,
and dogs.
2. Axis:
a. In zoology, an "axis" typically refers to an imaginary line or structure around
which body parts or structures are organized or arranged. It represents a
central line or orientation within an organism's body.
b. While the plane of symmetry divides an organism into symmetrical halves,
the axis provides a reference point or line around which symmetrical
structures are arranged.
c. The axis can refer to different orientations or directions within an organism,
such as the anterior-posterior axis (head to tail), the dorsal-ventral axis (back
to belly), or the left-right axis.
d. Understanding the axis helps describe the overall organization and
orientation of an organism's body plan.
Plane: A plane of symmetry is a plane that cuts a 3D figure into equal halves such
that the reflection of half of the object across the plane is the mirror image of the
other half.
Axis: The axis of symmetry is the axis around which the body preserves
its shape when rotated.
1. Plane of Symmetry:
a. In zoology, a "plane of symmetry" refers to an imaginary flat surface that
divides an organism or a body part into two approximately mirror-image
halves. This plane passes through the organism's body, dividing it into left
and right halves.
b. The plane of symmetry is a fundamental concept in describing the symmetry
of animals. It helps classify animals based on their symmetry characteristics.
c. For example, animals with bilateral symmetry have a single plane of
symmetry dividing them into two similar halves, such as humans, butterflies,
and dogs.
2. Axis:
a. In zoology, an "axis" typically refers to an imaginary line or structure around
which body parts or structures are organized or arranged. It represents a
central line or orientation within an organism's body.
b. While the plane of symmetry divides an organism into symmetrical halves,
the axis provides a reference point or line around which symmetrical
structures are arranged.
c. The axis can refer to different orientations or directions within an organism,
such as the anterior-posterior axis (head to tail), the dorsal-ventral axis (back
to belly), or the left-right axis.
d. Understanding the axis helps describe the overall organization and
orientation of an organism's body plan.
