Question

1. Draw the alternation of generations in plants. Use the words sporophyte, gametophyte, spores, gametes, fertilization, mitosis, and meiosis. Label each part of the cycle haploid (n) or diploid (2n).  

2. Compare sexual reproduction in plants to sexual reproduction in humans.  

a. In each case, what type of cell division produces the gametes?

b.In each case, does a parent and offspring generation look similar or different?

c. In each case, can asexual reproduction occur?  

Answer 1

The life cycle of a plant begins with a diploid sporophyte. It contains sporangium with has diploid spore mother cells. It undergoes meiosis to form haploid spores.

The spores germinate to form haploid gametophyte. The gametophyte bears gametangia. Female gametangia is archegonia and male gametangia is antheridia. Gametangia undergoes mitosis to form haploid gametes.

Egg is the female gamete and sperm is the male gamete. Both of them fertilize with each other to form a diploid zygote. The zygote is the first cell of sporophytic generation. It germinates to form diploid sporophyte and the cycle repeats.

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