18/10/15

This week the lesson was on pollination and development of plant embryo. Although I have learnt this before but this is the topic that I am going to present for the Scientist Trainee Programme so I paid extra attention during the lesson.

The lecture refreshed my memory on the stages of plant undergoes to produce offspring. The male reproductive organ –stamen consists of anther and filament while the female reproductive organ-pistil consists of stigma, ovary and style. 

Each anther contains four pollen sac. The pollen mother cell undergoes meiosis to form tetrads of haploid microspores. The ovary undergoes meiosis to form ovule. Pollination occurs through pollinating agent like insect, wind and water. When pollen landed on stigma, pollen tube is stimulated to grow and transfer microspore to the ovary. Then double fertilisation occurs and seed is formed. This is the life cycle of angiosperm.

However, development of embryogenesis of plant includes the growth of zygote into basal cell and apical cell. Apical cell will grow into embryo while basal cell will grow into suspensor. They will then undergo globular stage, heart stage and torpedo stage to form seed. Dicotyledon has heart shape during heart stage and torpedo stage but monocotyledon does not have heart shape.

Throughout the lesson and SCL activities I have remembered how gametes and seeds are formed . With the knowledge I have I will try to teach the students in primary school in a simpler way and develop their interest in science.