Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. In fact, each species of plants and animals has a set number of chromosomes. A fruit fly, for example, has four pairs of chromosomes, while a rice plant has 12 and a dog, 39. Top of page.
The germination time for grass seed ranges from 5 to 30 days depending on the variety. It can be even longer than this in cooler temperatures. This is how long it will take to actually see the grass growing. Until this point, the seed, or the soil and mulch in contact with the seed, must stay moist.
When you plant grass seeds, it is important to match the grass species to your local climate and plant the seeds at the correct time and rate. To get a rough idea how long for your lawn to get established, add 30 to 45 days to the germination time. Annual ryegrass (Lolium multiflorum) and perennial ryegrass (Lolium perenne) seeds germinate in five to 10 days. Rough bluegrass (Poa trivialis) seeds take seven to 10 days. Tall fescue (Lolium arundinaceum) seeds germinate in seven to 12 days.