SCIENCE

PLANT REPRODUCTION

TYPES OF PLANT REPRODUCTION THERE ARE TWO KINDS OF PLANT REPRODUCTION : SEXUAL REPRODUCTION AND ASEXUAL REPRODUCTION. THE PART OF THE PLANT RESPONSIBLE FOR SEXUAL REPRODUCTION IS THE FLOWER. ASEXUAL REPRODUCTION OCCURS WHEN A NEW PLANT GROWS FROM THE STEM OR LEAVES OF AN EXISTING PLANT. ALL PLANTS. CAN REPRODUCE BY SEXUAL REPRODUCTION. SOME PLANTS CAN REPRODUCE BY BOTH METHODS.

SEXUAL REPRODUCTION SEXUAL REPRODUCTION : IN PLANTS. A MALE SEX CELL AND A FEMALE SEX CELL UNITE INSIDE A FLOWER. THERE ARE DIFFRERENCES BETWEEN THE PARENT PLANT AND THE OFFSPRING PLANT.

ASEXUAL REPRODUCTION TUBERS, BULBS AND STOLONS ARE TYPES OF STEM : TUBERS : ARE STEMS IN THE SOIL. BULBS :ARE ALSO UNDERGROUND STEMS. STOLONS : ARE STEMS ABOVE THE GROUND. ASEXUAL REPRODUCTION THE NEW PLANT IS IDENTICALTO THE ORIGINAL PLANT.

FLOWER,FRUITS AND SEEDS THE FLOWER IS THE REPRODUCTIVE UNIT OF FLOWERING PLANTS. THE PARTS OF A FLOWER INCLUDE THE FOLLOWING : COROLLA, CALYX, PISTIL AND STAMEN. COROLLA IS THE COLORFUL PART OF THE PLANT. PETALS FORM THE COROLLA. CALYX IS AT THE BOTTOM OF THE FLOWER. SPEALS FORM THE CALYX. PISTIL HAS THREE PARTS: A STIGMA, A STYLE AND AN OVARY. STAMEN HAS TWO PARTS: A FILAMENT AND AN ANTHER.

SEEDS AND FRUITS SOME FRUIT, LIKE THE PEACH, ONLY HAVE ONE SEED. OTHER FRUIT, LIKE THE APPLE HAVE SEVERAL. SEEDS HAVE A PROTECTIVE COVERING. THAT IN SOME SEEDS, SUCH AS PEAS, IS VERY THIN. AFTER FERTILIZATION, PART OF A FLOWER DEVELOPS INTO A FRUIT. ARE: FLESHY FRUITS ACCMULET WATER. OF GRAPES, CUCUMBERS, APPLES ETC. NUTS DO NOT ACCUMULATE WATER. ACORNS, CHESTNUTS, ALMONDS ETC.

FROM FLOWER TO FRUIT POLLINATION IS THE TRANSFER OF POLLEN FROM THE MAL PART TO THE FEMALE PART OF FLOWERS.Ñ SELF-POLLINATE, THE POLLEN COMES FROM THE STAMENS OF THE SAME PLANT. CROSS – POLLINATE THE POLLEN COMES FROM THE STAMEN OF ANOTHER PLANT OF THE SAME SPECIES. THE WIND TRANSPORTS THE POLLEN OF WHEAT FLOWERS. ANIMALS AND INSECTS, LIKE HUMMINGBIRDS AND BEES, ALSO TRANSPORT POLLEN.

FERTILIZATION FERTILIZATION A MATURE FLOWER PRODUCES SEX CELLS: MALE SEX CELLS, OR CELLS, OR SPERM, IN THE ANTHERS AND FEMALE SEX CELLS, OR OVULES, IN THE OVARY. DURING REPRODUTION, A FEMALE CELL UNITES WITH A MALE CELL. - THE ANTHER PRODUCES A LOT OF POLLEN GRAINS. - THE POLLEN GRAINS FALL ON THE STIGMA - THE POLLEN GRAINS OPEN AND THE MALE SEX CELLS COME OUT.

GERMINATION AND GROWTH GERMINATION A SEED PRODUCES A NEW PLANT THROUGH THE PROCESS OF GERMINATION. SOME SEEDS NEED SPECIAL CONDITIONS TO GERMINATE. GROWTH A PLANT GROWS GRADUALLY AFTER GERMINATION. IT KEEPS GROWING UNTIL IT BECOMES AN ADULT PLANT. SOME PLANTS,LIKE TREES,KEEP GROWING THROUGHOUT THEIR LIVES. THE LIFE SPAN OF PLANTS VARIES A LOT.

TREES THROUGHOUT THE YEAR TREES CHANGE THROUGHOUT YEAR. THE LEAVES ON TREES ALSO CHANGE.EVERGREEN TREES HAVE LEAVES ALL YEAR LONG.FOR EXAMPLE, PINE TREES ARE EVERGREEN. DECIDUOS TREES LOSE THEIR LEAVES IN AUTUMN. FOR EXAMPLE, APPLE TREES ARE DECIDUOS.

WHAT ARCREENHOUSE ? GREENHOUSES ARE ENCLOSED AREAS WHERE WE GROW PLANTS.

CULTIVATING PLANTS WE CAN CONTROL EVERYITHING THAT AFFECTS PLANT REPRODUCTION AND GROWTH.KEEP THE TEMPERATURE AND HUMIDITY AT OPTIMUM LEVELS. THE PLANTS GROW QUICKLY. THEY PRODUCE FRUIT SEVERAL TIMES A YEAR.

THE ADVANTAGES GROWING PLANTS IN GREENHOUSES GIVES US A LOT OF FRUIT ALL YEAR LONG. EACH FRUIT HAD ITS SEASON. THIS IS BECAUSE WE GROW THEM IN GREENHOUSES.