Ferns are vascular plants differing from the more primitive lycophytes by having true leaves (megaphylls). They differ from seed plants (gymnosperms and angiosperms) in their mode of reproduction - lacking flowers and seeds. Like all other vascular plants, they have a life cycle referred to as alternation of generations, characterized by a diploid sporophytic and a haploid gametophytic phase. Unlike the gymnosperms and angiosperms, the ferns' gametophyte is a free-living organism. Life cycle of a typical fern: # A sporophyte (diploid) phase produces haploid spores by meiosis; # A spore grows by mitosis into a gametophyte, which typically consists of a photosynthetic prothallus # The gametophyte produces gametes (often both sperm and eggs on the same prothallus) by mitosis # A mobile, flagellate sperm fertilizes an egg that remains attached to the prothallus # The fertilized egg is now a diploid zygote and grows by mitosis into a sporophyte (the typical "fern" plant).
in the life cycle of a fern, the dominant and recognizable stage is the diploid sporophyte. the the younger sporophyte grows from the gametophyte.
The life span of a human is typically measured from birth to death, with the average life expectancy being around 70-80 years. Factors such as genetics, lifestyle choices, and health care can influence an individual's life span. Additionally, advances in medical technology and healthcare can also impact life expectancy.
forever
The life span of a star is determined by its mass. More massive stars burn through their fuel faster and have shorter life spans, while less massive stars have longer life spans. The life span of a star can be estimated using the mass-luminosity relation and the star's initial mass.
A paddy or rice plant grows very fast. The average life span of the paddy plant is only about three months.
Indefinite
The life span of the white male 75.7 years. This is the new life span after the scientists Did the reasearch in 2012.
A average life span is about 1 year
The life span of an apartment is seven years.
a span of life (life span) is how long an organism (a living thing) can live.
The life span of a Multicellular organism is not limited to the life of a single cell.
it depends on the type of spieces it depends on the life span
They have a life span of 3 to 7 years.
15 years is the average life-span for a dominican
The life span of a hippo is approximately 45 years.
The life span of a Saluki is 12 - 14 years.
The average life span is 12-15 years.