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Plant Reproduction
stigma | pollen catcher; female |
---|---|
stigma | pollen catcher; female |
style | connects stigma to ovary |
anthus | makes pollen |
What happens to a fertilised egg cell to turn it into an embryo? | Egg cell grows & divides--> ovary swells up (becomes fruit)--> seeds (eggs) contained within --> fruit ripens and bursts --> seeds disseminated |
pollination | pollen grains carried from anther to stigma |
fertilization | egg nucleus joins with pollen grain nucleus |
stamen | male reproductive organ; anther, filament |
carpel | female reproductive organ; stigma, style, ovary, ovule |
egg cell | female sex cell |
pollen grain | male sex cell |
cross-pollination | creates new variety; pollen from one flower carried by wind/animal to stigma of another flower |
How does nature protect against self-polliation? | 1. Plants have only male flowers or female flowers; 2. Pollen released, anthers split and die, stigmas mature and are ready to accept pollen |
How does pollen travel? | Animal or wind |