how do spore bearing and cone bearing plants can provide resources to our community?
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how do spore bearing and cone bearing plants can provide resources to our community?
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Answer:
Cone-bearing plants have pollen and seeds. Spore-bearing plants produce no pollen or seeds.
Cone-bearing plants produce spores and gametes in addition to pollen and seeds, however spore-bearing plants are limited to spores and gametes, and produce no pollen or seeds.
In cone-bearing plants, the dominant diploid (2n) multicellular sporophte generation produces haploid (n) spores by meiosis that develop by mitosis into the smaller multicellular haploid (n) gametophyte generation which produces haploid (n) gametes by mitosis.
The multicellular haploid (n) female gametophyte generation that produces haploid (n) eggs by mitosis, is dependent and housed within the dominant multicellular diploid (2n) sporophyte generation.
The multicellular haploid (n) male gametophyte generation that produces haploid (n) sperm by mitosis is housed in pollen grains for dispersal.
A diploid (2n) zygote is produced upon fertilization, that develops by mitosis into a diploid (2n) multicellular sporophyte embryo contained in a seed. If the seed germinates, the dominant diploid (2n) multicellular sporophyte generation will develop by mitosis.
In spore-bearing plants, the above description still applies. However, the multicellular diploid (2n) sporophyte embryo is not contained in a seed. And, the multicellular haploid (n) gametophyte in not contained in pollen.
With out pollen to disperse the multicellular haploid (n) gametophyte generation, the haploid (n) sperm produced by mitosis, must swim to the egg.
Also, in some spore-bearing plants, the multicellular haploid (n) gametophyte generation is dominant, hosting the dependent multicellular diploid (2n) gametophyte generation. While in some spore-bearing plants, the multicellular diploid (2n) sporophyte generation is dominant, and the haploid (n) spores produced by meiosis are dispersed.
Explanation:
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