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WEEK 4
TOPIC: DEVELOPMENT OF NEW SEEDS
CONTENT:
SUB-TOPIC I: PROGRESS OF DEVELOPMENT OF ZYGOTE IN THE FLOWERING PLANT
Meaning of seed
Seeds are plant parts containing embryo and this embryo give rise to new individual.
Pollination is the first step in the process of sexual reproduction in flowering plants. It is followed by fertilization and development of zygote. These steps change the flower into a fruit enclosing seeds, the potential next plan.
Pollination: this is the process whereby mature pollen grains are transferred from the anthers to the mature stigmas or pollination is the transfer of pollen grains from the anther to the mature stigma of a flower.
There are two types of pollination, they are:
Cross Pollination
Cross pollination occurs when the pollen grains from one flower are transferred to the mature stigma of another plant of the same species.
Features Of Cross Pollination
In monoecious plants, where male and female flowers occur on the same plants, self pollination is prevented by:
(a) The stamens ripening before the stigmas (flower is described as being protandrous e.g. sunflower, sativa)
(b) The stigmas ripening before the stamen (protogynous e.g. grasses)
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