A. Label each structure:
1. Sporangium
2. Sporophyte (stalk)
3. Foot
4. Seta
5. Capsule
6. Gametophyte (leafy green form)
7. Archegonium
8. Antheridium
9. Sperm
10. Egg
11. Rhizoids
12. Gametophyte (leafy green form)
13. Rhizoids
B. Answer the following questions:
1. The gametophyte is composed of haploid cells and is the dominant, visible stage in the moss life cycle; it produces gametes (sperm and egg).
2. The sporophyte is composed of diploid cells and grows from the fertilized egg; it consists of a foot, seta, and capsule that produce spores.
3. Sperm is produced in the antheridium. In the archegonium, the egg is produced.
4. A zygote forms when a sperm fertilizes an egg. It is diploid.
5. The sporophyte develops from a zygote.
6. Meiosis causes this change — spores are produced by meiosis within the sporangium, reducing the chromosome number from diploid to haploid.
7. Protonemata are the first filamentous, haploid growth stage that develops from a germinated spore; they give rise to the leafy gametophyte.
8. Evidence includes: similar chloroplast structure, shared photosynthetic pigments, comparable cell wall composition, and molecular genetic similarities indicating common ancestry with green algae.
Parent Tip: Review the logic above to help your child master the concept of bryophyte worksheet.
