Transcript UNIT The reproduction function GYMNOSPERM FLOWERS Natural Science 2. Secondary Education UNIT Gymnosperm flowers Male and female cones • Gymnosperm flowers usually take the form of.

UNIT
4
The reproduction function
GYMNOSPERM FLOWERS
Natural Science 2. Secondary Education
UNIT
4
Gymnosperm flowers
Male and female cones
• Gymnosperm flowers usually take the form of cones and tend to
have the following characteristics:
• They are not particularly attractive flowers. They do not have calyxes
or corollas.
• They are generally unisexual, which means that there are separate
male and female cones.
Female
cone
Seeds
Natural Science 2. Secondary Education
Male cones
UNIT
4
Gymnosperm flowers
Male cones
Male cone
Pollen grains
Male sexual organs
Natural Science 2. Secondary Education
UNIT
4
Gymnosperm flowers
Female cones
• Pollen grains are transferred to
the female cone by wind or by
insects. The ovules are fertilised
and develop into seed.
Female cone
Exposed ovules
Protective scales
Seeds
Pollen grain
Cone
(fertilised female cone)
Natural Science 2. Secondary Education