Some people with chest pain have normal or minimal narrowing of heart arteries; in these patients, vasospasm is a more likely cause for the pain, sometimes in the context of Prinzmetal's angina and syndrome X.
You are here. Pure Live Seed. Pure live seed (PLS) is a measure used by the seed industry to describe the percentage of a quantity of seed that will germinate. PLS is obtained by multiplying the purity percentage by the percentage of total viable seed, then dividing by 100.
All About Seeds All About Fruit Many plants use seeds to reproduce. A plant produces a very small version of itself, called an embryo. This embryo, together with its stored food, is covered with a thin covering called the testa (seed coat). The embryo, stored food, and testa make up the seed.ll About Plants Plants are living things that are made up of cells. They need air, water, soil, and sunlight to live. They cannot move from place to place, but their leaves move to catch the sun and their roots move to-wards water. Their seeds can be carried by animals or blown by the wind.