how do weeds reproduce? im doing a report for school!
134540
by seeds\nsome seeds sit dormant almost all year long until the right conditions are there for them to germinate..like heat and water..\nit one is there and the other is not many weeds will not germinate at all.\nweeds are very efficient at what they do.\nGood luck
387782
They spray the foods with poisons when they grow it and reprodue the plants that can survive the poisons that kill most of the other plants of all types and pests, some of the crop can live when most gets poisoned, they geneically reproduce those ones so that the foods can ook great no matter how much toxins are in them.\n\nperhaps montesanto can help you with toxics and genetics, their crops look awesome
622577
Look in the plant plot!!
164424
Here's a few:\n\nMost roaches are female.\n\nThe females can clone themselves.\n\nFemales only need to have sex *once* - they store sperm for later use.  \n\nFemales can produce in excess of one million eggs over the course of their lifetime.\n\nRoaches are necrovores - they only eat things that are already dead.
494052
First, note the word "true-breeding".  That indicates each plant is homozygous for all those traits, which means that you don't have to worry about that plant being het for any of those genes.  And it means that they only make a single kind of gamete with regard to thsoe 4 genes.\n\nTechnically, these loci might all be linked to each other, you would need F2 data to know for sure.  But you are supposed to assume that four traits are controlled by 4 genes.\n\nNow, since the parents were homozygous for all their genotypes, the offspring will all be identical, they will all be het for those genotypes.  And which ever phenotype they are, that's the dominant one for that trait.  So purple, green, terminal, and yellow are the dominant phenotypes.\n\nAnd there are 16 different gametes to be made, because there are 4 genes (presumably) and each is het in the F1.\n\nThe only way for an F2 to show all 4 recessive phenotypes would be for it to get a gamete from each parent taht also had all four recessive alleles.  So 1 in16 gametes will fit the bill, so the odds of getting that gamete from on parent is 1 in 16, the odds of getting it from the other parent is 1/16, so the odds of getting it from both is 1/256.
466404
more plant cells.  photosynthesis (production of energy)+water+soil nutrients=plant cell reproduction and growth.
376425
If it is the same species of flower, the pollen lands on the stigma (easy to remember...stigma ma mother ei female / stamen....men....male) a chemical reaction occurs that makes the pollen develop a tube/ straw that leads down the stigma to where the seeds are...get a text book out for this cant remember the name of that thing....the DNA is then taken up by the flower in the production of the seed....Oooo dear so many years ago.....cant remember a thing properly
477973
It comes up as a tight green bud, opens into a bright yellow flower, then the flower withers and the poofy seed things develop, ready to carry the seeds somewhere else so the whole process can begin again. \nYou are 100% correct in this. \nWhere do you live that there aren't dandelions around to demonstrate? In our yard, they grow year round and they are very vigorous in their growth.
311341
Yes.\n\nSpartina anglica is a species which reproduces sexually and naturally mutated late in the 19th century from a parent species which only reproduces vegetably. Originally it was an accidental hybrid between S. maritima and the closely related S. alterniflora and incapable of producing seeds, but capable of spreading by vegetative means. A mutation allowed S. anglica to begin producing viable seeds, but it does not hybridize with either S. maritima or S. alterniflora due to chromasome doubling. This species normally out-competes other cord grasses, so it would be difficult to maintain the position that this is some sort of "slow decline in species" as it is a prime example of survival of the fittest and there is some concern it will lead to the extinction of some of the species that were it's ancestors.
340864
Taking pollen grains from one plant and puttig them on the stigma of flowers of onother plant is cross pollination. When this happens properties of two plants get mixed so a new improved plant can be produced. Bees come in cotact with pollen grains of one plant when the collect the nector and when they vist other plant they leave pollens in the flowers in process pollinate them.\nTo attract bees, plants produce nector and scent and when bees visit these flowers they are pollinated so more fruits are produced\nThis realtionship for the benefit of both hence it is called symbiosis.
73964
I think you said it best first: a weed is just an unwanted plant.\n\nDon't believe that crap about a weed just being a plant we haven't found a use for.\n\nI'm a restoration ecologist and I have seen weeds destroy more biodiversity and habitat than ANY other cause.\n\nEDIT: myrtguy: you usually have good answers on these issues but they may be a little misleading here.  Restoration ecologists do a lot more than just working on areas that humans have made a mess of (though you are right - that is mostly what they do).  It is worth mentioning that you would be hard pressed to find ANY area of land that has not been influenced by humans to one extent or another.\n\nYou are also right about plants in gardens but... Many of our most agressive weeds are plants that have escaped from gardens unintentionally (such as Purple loostrife or Leafy Spurge).  Too many nurserys sell these things to coustomers who transport them all over the U.S. (and the world).
131398
grass or skunk, i dont know what you interparate into hash or weed. over here UK pot is resin and hash is dried buds..... its all good though!
195693
In every packet of grass seed, there is one, genetically "rogue" seed.  This seed germinates at a slower rate than the rest of the grass seed.\n\nThe regular grass seed (such as creeping red fescue, for instance) grows to become a healthy, even sward.  The single, irregular seed pushes out a single, pointed root downwards.  The root carboniferises into a woody stem, from which a large, single leaf protrudes upwards.  This leaf, in the shape of a flat, regular-sided square or rectangle grows at an angle of ninety degrees to the root.  The outer-facing side of the leaf develops markings which appear in the form of letters reading "KEEP OFF THE GRASS".\n\nHope this helps.
561376
Most likely through photosynthesis. Billions of plants can't be wrong.
115093
You have got some things muddled up here.\n\nGestation and offspring dependency doesn't apply to flowering plants.\nSexual maturity and frequency of reproduction - there are three patterns:\n- annuals - life cycle complete within one year, parent plant dies;\n- biennials - life cycle takes two years - first year plant establishes itself, over-winters, reproduces next year and dies;\n- perennials - live for many years and make seeds every year.\nAs for the number of seeds they make, this is very variable. Some species make only a few, some make lots.\n\nLink 1. - general information.\nLink 2. - a bit more detail.\nLink 3. - a site to help with all the technical words, very useful.
87156
Like the Dude said above.. they have flowers above the water.\nFlowers get pollinated, seeds grow, seeds are distributed thru the water, fall to the bottom and grow the next generation... its a circle of life thing.
70194
regeneration of RuBP\n\nFrom the link below: