Question

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Question 32 Which statement is most accurate concerning plant evolution? a. Many more recently evolved plants no longer have a sporophyte. b. The gametophyte has become smaller, and the sporophyte has become larger. c. The sporophyte has become larger, but the gametophyte has not changed. d. More ancient plants were mostly diploid sporophytes. e. More recently evolved plants are mostly haploid gametophytes.

Answer 1

Option (e) in the early stage of plants evolution gametophytes are the dominant life form , but after thousands of year of evolution , gamatophyte reduces in size , and dependent on sporophytes. In modern day it reduced to haploid chromosomes number.

In plants evolution we know that reproduction shifting asexual to sexual method. In modern era majority of the plants lies in angiosperms categories , angiosperms prefers sexual reproduction because it result in genetic diversity, it is the biggest advantage of sexual reproduction over asexual reproduction. When a single organism reproduces asexual it produces the Exact copy of parent organism , and sexual reproduction provides Verity of new combination gene , and now days our environment is changing so diversity is an advantage for organism.

In above discussions we see that majority of the modern days pants reproduce via sexual reproduction. We know that in sexual reproduction two parents are involved . So they produces haploid gamatephyte , after fertilization They restore the diploid number of chromosomes and create a zygote of (2n).