Of the four parts of alteration of generations cycle (embryo/sporophyte, spore, gametophyte, gamete), which one does pollen belong to?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Of the four parts of alteration of generations cycle (embryo/sporophyte, spore, gametophyte, gamete), which one does pollen belong to?
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Step 1- Introduction

ALTERATION OF GENERATION:- It is also known as heterogenesis, in which an organism will have alternate phases of sexual reproduction and asexual reproduction both. It has two phases:-

1)Haploid phase

2) Diploid phase

In this, haploid spores ( first part) germinate into the haploid gametophyte( second part). After the maturation of this haploid gametophyte, it produces two gametes (Third part) from single or different organisms. These gametes then fuse to form Zygote which is diploid in its nature and then after the maturation of diploid zygote it changes into a diploid sporophyte (Fourth part).

This is how all land plants and algae undergo sexual reproduction.

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