Why do some seeds not germinate?
113912
Commercial processing of seeds is designed to ensure maximal germination, not to stop them germinating.\n\n\nThe simple fact is that not all seeds are viable, just as not all pregnacies result in children.\n\n\nFor various reasons seeds can fail. Sometimes that is because of genetic flaws within the seeds. Sometimes the seeds get infected with diseases or mites that eat them before they germinate.\n\n\nMostly seeds fail simply because theye weren't treated right. Sometimes the seeds are too old and have died. Sometimes they are buried too deep, or have been watered too much, or not watered enough, or let get to hot, or too cold or a million other environmental factors that prevent germination.
60093
Some plants adapt to a crowded environment by changing their growth characteristics.  Many plants can sense crowding by the lack of an ability to spread their roots very far.  Some plants will start to change in what I consider to be an impressive display of "The Survival of the Fittest."  A short, bushy plant can start growing thinner and taller to fight out its neighbors for sunlight.  This can be common on forest floors (and even in the potted plant on my windowsill! It started growing upwards instead of outwards when it outgrew its pot. It must have thought it needed to start competing for light).
184746
1. Wind- Some seeds are carried to a new place by the wind.\n\n2. Water Dispersal- Fruits which float such as those of the water lily and the coconut palm are carried by water.\n\n3. Animal Dispersal- Some seeds that are ingested by animals can be digested and later excreted out far away from the parent plant.  Some seeds also have burs so they can attach themselves to animal fur only to later be dropped.\n\n4. Explosion- Some plants have pods that explode when ripe and shoot out the seeds.\n\n5. Fire- A number of species of pine have cones that only open after a fire. These are called serotinus.  Jack pines have cones that are held closed by a resin sensitive to high temperatures. These cones will not open to release their seeds until a critical temperature is reached.
427248
plants on land have a harder time spreading out their young, look at pollen and seeds.  water plants just release their gametes and they float away
734392
Depends on the plant. Some plants grow faster than others.
789564
my guess is that the humidity is too high.  But the real reason apple trees do not grow in india is that cold weather is essential in seed development.  You could but the seeds in your freezer and trick them into sproutingbut you may run into trouble getting your trees to flower and form fruit because you day lengths dont change like they do at more northern latitudes.
272400
Hey its like asking the average volume of water while washing the dishes. By this I mean they vary and unless you have a static mass of a plant you might have your dedusion.\n\nThis depends on the height and age or stage of a plant during growth.\n\nLike come to think of the seed. While germinating the water from the cotyledon is used up rapidly which couses an imbalance but when the radical form, the variability changes so it all depends.
117773
in the absence of an aquatic environent, some aquatic plants die, and mutated plants with special characteristics, such as seeds, live. these more "fit" plants multiply, and then you have a plant species that can adapt without an aquatic environment. \nthis is similar to (but much more complicated than) bacterial resistance to antibiotics, or crop insects resistance to insecticide.
723162
The optimal temperature for the germination (sprouting) of radish seeds is between 45 and 85˚F.  That is the temperature range in which the highest percent of seeds will grow.  At temperatures below 45˚F or above 85˚F, fewer seeds will grow.  Above 95˚F, radish seeds will not germinate (sprout) at all.\n\nLike most seeds, radish seeds grow best when the soil pH is between 6 and 8.  A pH less than 6 or more than 8 would result in a lower percentage of seeds sprouting.
228284
All we can do is prepare the soil and plant seed. Then it's in God's hands to germinate. God provides the rain. Then maybe we can pull some weeds and cultivate to help it grow.
1119022
gram can be grown in cotton because cotton has a lot of pores which can store water and air. these grams absorb this water and the nutrients along with it and germinate into little seedlings. then they have to be transplaned into the open land so that they can get sufficient nutrients. the small grams need very little water and nutrients to germinate in their initial stages.
879466
The vegetable itself does not have seeds.\nThe plants they come from go to seed.\nIf you let a carrot, or cucumber, or radish grow too\nlong, it 'goes to seed' as they say on the farm.\nA cluster of seeds usually sprout out of the top\nof the plant for the next set of crops.
318712
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
222628
Wind: Exmample--Maples hae seeds with "wings" line a helicopter, called a samara, that are spread by the wind.\n\nWater: Mangroves produce seeds that are long and pointed, that float down the river and will eventually root.\n\nAnimals: Oaks rpoduce Acorns, some are eaten and others are carried off and planted by squirrels.\n\nFriction: Beggar Lice is a plant that makes seeds that stick to animals walking by.\n\nGood Luck
604070
You need to get the sperm to the eggs and with an "army " of sperm, its more likely that some of it will eventually make it past all of the factors that might cause it from not reaching its target... such as when pollen is on a pollinator, some of it is usually lost in flight or just in the regualr movement of the animal that does that job. some plants are pollinated by the wind and the more that is released increases the  chance that some of it will reach the egg. Eggs are usually very close to the adult version of the plant or even within the plant before they are fertalized so they are mainly stationary... with more chances to reach the egg it increases the fecundity.
381497
The answer is C because seed- bearing plants, or spermopsidae, adapted to not need H2O for reproduction. The gametophyte generation in seed plants is the pollen and seeds. Other plants, such as ferns DO have a primative form of a vascular system, therefore C is the only answer...
643651
Some plants are notorious self seeders.  Their seeds drop very easily and grow even easier.  Others depend on insects and birds to pick up their seeds and spread them.