Question

When and where does meiosis occur in Bryophytes?

Answer 1

Meiosis takes place in the tiny sprorophyte stage of bryophytes, which are attached to and dependent on the much larger gametophyte stage. The sporophytes create spores by meiosis, which disperse by wind and water to form new gametophytes. Fertilized eggs in gametophytes form sporophytes at the site of fertilization.

 

Answer 2

Zygote represents first meiotic division

Explanation:

• zygote represents the first cell of sporophyte it undergoes meiotic division to form sporophyte which is dependent on gametophyte.
• The sporophyte at maturity bears sporangia where mother cell undergoes meiosis to form haploid spores.
• Meiosis takes place in the tiny saprophyte stage of bryophytes, which are attached to and dependent on the much larger gametophyte stage. The saprophytes create spores by meiosis, which disperse by wind and water to form new gametophytes. Fertilized eggs in gametophytes form saprophytes at the site of fertilization.
• The sporophyte stage of bryophytes is diploid, with two versions of each chromosome in its DNA, while the gametophyte is haploid with only one. The spores the sporophyte forms are haploid, as are the gametes formed by the gametophytes. Because the gametophytes themselves are haploid, however, they produce gametes by mitosis rather than meiosis. Bryophytes require at least a thin film of standing water for their gametophytes to reproduce. This is because bryophyte sperm must be able to swim between plants in order to fertilize an egg.