<span>The answer is to control the crossing of the traits.
The idea of preventing plants from self-pollinating is to control the crossing of the traits. If plants were self-pollinating, he could not know if the traits are inherited from the same plant or from the other. By preventing this, he could cross parents with known phenotype and that way learn about crossing process and inheriting process.</span>
Asexual reproduction is where the offspring are genetically identical to their single parent. (Bacteria, spores etc.)
Sexual reproduction produces genetic diversity like the production of new living organisms by combining genetic information from 2 individuals of different sexes. ie: male female.
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Smoking two packs of cigarettes a day for twenty years reduces one's life span by EIGHT YEARS.
Cigarette smoking has serious consequences on the health of the smokers and it has been reported that for every cigarette a man smokes his life span is reduced by 11 minutes, thus, a cartoon of cigarette a day is equivalent to a day and a half [36 hours] loss in life span.