PLANT SEXUAL REPRODUCTION WITH MEIOSIS SEXUAL REPRODUCTION IN

PLANT SEXUAL REPRODUCTION WITH MEIOSIS

SEXUAL REPRODUCTION IN SEED PRODUCING PLANTS � Some plants sexually reproduce through their seeds. � Before a seed can grow into a new plant an egg with ½ the amount of chromosomes (female gamete) must join with pollen (male gamete) with the other ½ of the chromosomes to be fertilized. (from meiosis)

ANGIOSPERMS � Pollination and fertilization take place in the flower of the plant. � The seeds are in a closed ovary unlike in gymnosperms (pinte trees, etc. ).

PARTS OF A FLOWER � Petals: attract insects by their bright color and scent. � Sepals: Green leaves around the outside of the flower. Sepals are usually smaller than the petals. Used to protect the flower while it is still in bud.

FEMALE REPRODUCTIVE PARTS (PISTIL) � Stigma - sticky top part at the top where pollen lands � Style - stalk that is in between the stigma and ovary � Ovary - where the eggs (female sex cell) are formed � Ovule – inside the ovary, each one with its The egg will turn into a fruit once fertilized. own seed

MALES REPRODUCTIVE PARTS (STAMEN) � Stamens: This is where pollen is made. It is the male part of the flower. � The stamen has two parts: � the filament (a thin stalk) � the anther which is where pollen (male sex cell) is made.

ANGIOSPERM REPRODUCTION � Sexual reproduction in a flowering plant has FOUR main stages: 1. Pollination – pollen (male gamete) carried to stigma (female gamete) 2. Fertilization - pollen enters stigma, goes down style into ovary

SEED DISPERSAL – MOVING THE SEEDS AWAY FROM THE PARENT PLANT SO THEY CAN GROW A plant will disperse their seeds in many ways: 1. Wind 2. Animals 3. Water 4. Explosion/bursting

GERMINATION The last stage of plant reproduction is germination. This is when the seed actually starts to grow. � Conditions needed for germination: � warmth � oxygen � water � Without all three (water, oxygen and warmth) the seed will not grow.