Plants: haploid generation of a plant produces gametes (sperm and eggs) and is called the gametophyte; the diploid generation produces spores and is called the sporophyte/ diploid zygote.
1 You gain the most benefits and lessen the risks when you exercise in your target heart rate zone. 2  Usually this is when your exercise heart rate (pulse) is 60 to 80 percent of your maximum heart rate. 3  In some cases, your health care provider may decrease your target heart rate zone to begin with 50 percent.
Your target heart rate is actually a heart rate range in which you seek to exercise to meet certain fitness goals. For example, if you are an athlete who wants to improve anaerobic fitness, you might train using an intensity that puts you at a number of heart beats per minute that is 80 to 90 percent of the maximum heart rate you can sustain.