unit 4 the reproduction function natural science 2. secondary education alternation of generations...

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UNIT 4 The reproduction function Natural Science 2. Secondary Education ALTERNATION OF GENERATIONS IN A MOSS

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UNIT

4The reproduction function

Natural Science 2. Secondary Education

ALTERNATION OF GENERATIONS IN A MOSS

Gametophyte

Click on each pictureto find out more

The differents stages of the process

Female gamete

Male gamete

Young sporophyte

Sporophyte

Spores

Young gametophyte

Zygote

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UNIT

4Alternation of generations in a moss

Natural Science 2. Secondary Education

• This is the part of the moss that carries out sexual reproduction.

• It produces male and female gametes. The union of these gametes creates a sporophyte.

Gametophyte

Gametophyte

Male sexualorgans

Female sexual organs

Male gametes, which need water in order to reach the female sexual organs.

Female gamete

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UNIT

4Alternation of generations in a moss

Natural Science 2. Secondary Education

• The zygote is the result of the union of the male and female gametes.

• The zygote developes and produces a sporophyte.

Zygote

ZygoteYoungsporophyte

Sporophyte

UNIT

4Alternation of generations in a moss

Go back to the Start menuNatural Science 2. Secondary Education

• This is the part of the moss that carries out asexual reproduction through spores.

• It always grows on top of the gametophyte.

• It produces spores which are released, and in the right conditions develop into gametophytes.

Sporophyte

Sporophyte

Spores

Young gametophyte

Gametophyte

UNIT

4Alternation of generations in a moss

Go back to the Start menuNatural Science 2. Secondary Education