Sativa
A sativa plant is usually tall (1,5 mt or taller) with short branches. These plants originate in tropical areas (ex. Caribbean, Thailand islands, etc). There are more buds sites than on an indica, but the buds tend to be less dense. The effect of a sativa plant is a so called "cerebral" or "high", that is milder than an indica on the body but with a more pronounced effect on the brain. It goes from a creative feeling to a trippy feeling according to the strength. If we compare it with a wine, a sativa is the champagne of cannabis.
Pure Sativa is a total ‘Head High’. Pure Indica is a total ‘Body Stone/couch-lock’. A 50/50 cross will give a 50% ‘Head high’ and a 50% ‘Body Stone’. If an Indica plant is crossed slightly with a Sativa plant it will give a 60% ‘Body Stone’ and a 40%‘Head High’. A Sativa plant that is crossed slightly with an Indica plant will give a 60% ‘Head High’ and a 40% ‘Body Stone’. The 60/40 ratio is most common but some breeders can change that ratio.