CYCLES GOH JING RONG 4 E WHAT IS

CYCLES GOH JING RONG 4 E

WHAT IS A LIFE CYCLE? • ALL LIVING THINGS GO THROUGH A CYCLE CALLED A LIFE CYCLE. A CYCLE IS A PATTERN THAT REPEATS ITSELF CONTINUOUSLY. • LIVING THINGS REPRODUCE AND HAVE YOUNG. THE YOUNG GO THROUGH A SIMILAR LIFE CYCLE AS THEIR PARENTS. IN THIS WAY, LIVING THINGS OF THE SAME KIND CONTINUE TO BE FOUND ON EARTH.

WHAT ARE THE STAGES OF A LIFE CYCLE? • LET US LOOK AT THE LIFE CYCLES OF A HUMAN AND SOME ANIMALS. q LIFE CYCLE OF A HUMAN • WHAT ARE THE STAGES IN THE LIFE CYCLE OF A HUMAN? Ø EGG • AN EGG DEVELOPS INTO A BABY INSIDE THE MOTHER UNTIL IT IS READY TO BE BORN. Ø YOUNG • A BABY IS BORN ALIVE. THE BABY LOOKS LIKE THE ADULT. Ø ADULT • A FULLY DEVELOPED HUMAN ADULT IS ABLE TO REPRODUCE.

WHAT ARE THE STAGES OF A LIFE CYCLE? q LIFE CYCLE OF A CHICKEN • WHAT ARE THE STAGES IN THE LIFE CYCLE OF A CHICKEN? Ø EGG • EGGS ARE LAID ON LAND. EACH EGG HAD A HARD SHELL THAT PROTECTS THE YOUNG ANIMAL GROWING INSIDE. Ø YOUNG • A CHICK LOOKS LIKE THE ADULT. Ø ADULT • AN ADULT CHICKEN IS ABLE TO REPRODUCE.

WHAT ARE THE STAGES OF A LIFE CYCLE? q LIFE CYCLE OF A FROG • WHAT ARE THE STAGES IN THE LIFE CYCLE OF A FROG? Ø EGG • EGGS ARE LAID IN WATER. EACH EGG HAS A JELLY-LIKE COVERING. Ø YOUNG • A TADPOLE LIVES IN WATER. IT DOES NOT LOOK LIKE THE ADULT. IT HAS A TAIL AND BREATHES THROUGH ITS GILLS. Ø ADULT • AN ADULT FROG LIVES ON LAND IN WATER. IT DOES NOT HAVE A TAIL OR GILLS ANYMORE. IT BREATHES WITH ITS LUNGS AND SKIN INSTEAD. • CAN YOU NAME OTHER ANIMALS THAT ALSO CHANGE IN APPEARANCE AS THEY GROW?

WHAT ARE THE STAGES OF A LIFE CYCLE? q LIFE CYCLE OF A COCKROACH • WHAT ARE THE STAGES IN THE LIFE CYCLE OF A COCKROACH? Ø EGG • EGGS ARE LAID IN AN EGG CASE. Ø NYMPH • A NYMPH LOOKS LIKE THE ADULT, EXCEPT THAT IT IS SMALLER AND HAS NO WINGS. IT MOULTS SEVERAL TIMES AS IT GROWS. Ø ADULT • AN ADULT COCKROACH HAS WINGS AND CAN FLY.

WHAT ARE THE STAGES OF A LIFE CYCLE? q LIFE CYCLE OF A GRASSHOPPER • WHAT ARE THE STAGES IN THE LIFE CYCLE OF A GRASSHOPPER? Ø EGG • EGGS ARE LAID IN THE SOIL. Ø NYMPH • A NYMPH LOOKS LIKE THE ADULT, EXCEPT THAT IT IS SMALLER AND DOES NOT HAVE WINGS. IT MOULTS SEVERAL TIMES AS IT GROWS. Ø ADULT • AN ADULT GRASSHOPPER HAS WINGS AND IT CAN FLY. • BOTH THE COCKROACH AND GRASSHOPPER HAVE THREE STAGES IN THEIR LIFE CYCLES. THE STAGES ARE EGG, NYMPH AND ADULT. THE NYMPH OF THESE INSECTS LOOKS LIKE THE ADULT. • SOME INSECTS HAVE LIFE CYCLES WHICH ARE VERY DIFFERENT FROM THAT OF A COCKROACH OR GRASSHOPPER. • LOOK AT THE LIFE CYCLES OF A BUTTERFLY, A MOSQUITO AND A BEETLE. HOW MANY STAGES ARE THERE IN THEIR LIFE CYCLES? WHAT CAN YOU OBSERVE ABOUT THE YOUNG OF THESE INSECTS?

WHAT ARE THE STAGES IN A LIFE CYCLE? q LIFE CYCLE OF A BUTTERFLY • EGG Ø EGGS ARE LAID ON PLANTS. EACH EGG IS PROTECTED BY A HARD SHELL. • LARVA Ø THE LARVA OF A BUTTERFLY IS CALLED A CATERPILLAR. IT LIVES ON PLANTS. IT EATS A LOT AND MOULTS SEVERAL TIMES AS IT GROWS. • PUPA Ø A CATERPILLAR CHANGES INTO A PUPA. IT ATTACHES ITSELF TO A LEAF OR TWIG. IT STOPS FEEDING AND CONTINUES DEVELOPING IN THE PUPAL CASE. • ADULT Ø AN ADULT BUTTERFLY COMES OUT OF THE PUPAL CASE WHEN IT BREAKS OPEN. IT SPREADS ITS WINGS AND WAITS FOR THEM TO DRY BEFORE FLYING OFF.

WHAT ARE THE STAGES IN A LIFE CYCLE? q LIFE CYCLE OF A MOSQUITO • EGG Ø EGGS ARE LAID IN STILL WATER. • LARVA Ø THE LARVA OF A MOSQUITO IS CALLED A WRIGGLER. IT LIVES IN WATER. IT EATS A LOT AND MOULTS SEVERAL TIMES AS IT GROWS. • PUPA Ø A WRIGGLER CHANGES INTO A PUPA. IT LIVES NEAR THE WATER SURFACE. IT STOPS FEEDING AND CONTINUES DEVELOPING IN THE PUPAL CASE. • ADULT Ø AN ADULT MOSQUITO COMES OUT OF THE PUPAL CASE WHEN IT BREAKS OPEN. IT SPREADS ITS WINGS AND WAITS FOR ITS WINGS TO DRY BEFORE FLYING OFF.

WHAT ARE THE STAGES IN A LIFE CYCLE? q LIFE CYCLE OF A BEETLE • EGG Ø EGGS ARE LAID ON LEAVES. • LARVA Ø THE LARVA OF A LADYBIRD BEETLE LIVES ON PLANTS. IT EATS A LOT AND MOULTS SEVERAL TIMES AS IT GROWS. • PUPA Ø A LADYBIRD BEETLE LARVA CHANGES INTO A PUPA. IT ATTACHES ITSELF TO LEAVES AND STEMS OF PLANTS. IT STOPS EATING AND CONTINUES DEVELOPING IN THE PUPAL CASE. • ADULT Ø AN ADULT LADYBIRD BEETLE COMES OUT OF THE PUPAL CASE WHEN IT BREAKS OPEN. IT SPREADS ITS WINGS AND WAITS FOR ITS WINGS TO DRY BEFORE FLYING OFF.

WHAT ARE THE STAGES IN THE LIFE CYCLE OF A PLANT? • LIKE ANIMALS, PLANTS REPRODUCE TO ENSURE THAT THEIR OWN KIND WILL CONTINUE TO LIVE ON. • LET US LOOK AT THE LIFE CYCLE OF A BEAN PLANT. HOW MANY STAGES ARE THERE IN ITS LIFE CYCLE? q. LIFE CYCLE OF A BEAN PLANT • SEED • YOUNG PLANT • ADULT PLANT

WHAT ARE THE STAGES IN THE LIFE CYCLE OF A PLANT? q SEED • AS A SEED GROWS, THE ROOT GROWS FIRST. THE SHOOT GROWS AFTER SOME TIME. q YOUNG PLANT • THE SEED GROWS INTO A YOUNG PLANT. WHEN THE LEAVES DEVELOP, THE YOUNG PLANT STARTS MAKING ITS OWN FOOD. q ADULT PLANT • AS THE YOUNG PLANT GROWS INTO AN ADULT PLANT, MORE LEAVES DEVELOP TO MAKE FOOD. MORE ROOTS GROW TO HELP THE PLANT TAKE IN WATER AND MINERALS FROM THE SOIL. • FLOWERS APPEAR ON THE PLANT AFTER THE YOUNG PLANT GROWS INTO AN ADULT PLANT. THE FLOWERS DEVELOP INTO FRUITS FILLED WITH SEEDS. THESE SEEDS WILL THEN GROW INTO NEW PLANTS.

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