- published: 24 Jun 2014
- views: 5021273
In biology, a spore is a unit of asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavorable conditions. By contrast, gametes are units of sexual reproduction. Spores form part of the life cycles of many plants, algae, fungi and protozoa.Bacterial spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. Myxozoan spores release amoebulae into their hosts for parasitic infection, but also reproduce within the hosts through the pairing of two nuclei within the plasmodium, which develops from the amoebula.
Spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes. Two gametes fuse to form a zygote which develops into a new sporophyte. This cycle is known as alternation of generations.
You left your black gloves on my table
You left your dying horse in the stable
Thinking of a way to get you to stay
And up I was to fight the wind and waves for you
I?m an owl with giant eyes
I?m the scarecrow in the skies
The ultimate goal out facing the north
I wanted to stay inside and look down below with you
You never said then when I was in your arms
That was the moment that you lost your charm
[Incomprehensible]
And the trees, they never grew any leaves
Shake my arms, shake my head
I fell asleep when you got well
And I?m turning for the lights tonight