PLANTS - THE SOURCE OF FOOD

PLANTS - THE SOURCE OF FOOD

Multiple Choice

LET'S START OUR CHAPTER WITH A QUESTION.

WHAT ARE PLANTS?

• A . PLANTS ARE THE SOURCE OF OUR PRECIOUS THING OXYGEN

• B. PLANTS ARE THE SOURCE OF FOOD

• C. THEY ARE NOT VERY USEFUL JUST GARBAGE.

• D. BOTH (A) AND (B)

WHAT ARE PLANTS?

PLANTS ARE VERY IMPORTANT FOR US . APART FROM GIVING US MANY USEFUL PRODUCTS LIKE WOOD , MEDICINES, ETC. PLANTS ARE ALSO PRIMARY SOURCE OF FOOD FOR US .

HAVE U EVER THOUGHT ABOUT WHAT PLANTS EAT ?

PLANTS MAKE THEIR OWN FOOD . THEY MAKE FOOD IN THEIR LEAVES, IN THE PRESENCE OF SUNLIGHT THROUGH THE PROCESS OF PHOTOSYNTHESIS .

Multiple Choice

TAKE A GUESS AND THINK WHAT IS PHOTOSYNTHESIS ?

• THEY MAKE THEIR OWN FOOD BY THIS PROCESS.

• THEY BREATHE BY THIS PROCESS.

• THEY MAKE CHLOROPHYLL OUT OF IT

WHAT IS PHOTOSYNTHESIS?

PHOTOSYNTHESIS IS THE PROCESS OF MAKING FOOD BY LEAVES OF THE PLANT.

WHAT MAKES THE PLANT GREEN ?

THE GREEN COLOURED SUBSTANCE PRESENT IN THE LEAVES IS KNOWN AS CHLOROPHYLL . CHLOROPHYLL TRAPS THE SUNLIGHT .

WHAT DOES PHOTOSYNTHESIS MEAN?

PHOTOSYTHESIS IS A GREEK WORD IN WHICH PHOTO MEANS 'LIGHT' AND SYNTHESIS MEAN 'PUTTING TOGETHER'.

SEE THIS PROCESS

Multiple Select

NOW HAVE U SEEN AND STUDIED THE DIAGRAM .

THEN TELL ME RANDOMLY WHAT ALL PLANTS USE TO MAKE FOOD.

• WATER

• SUNLIGHT

• OXYGEN

• CARBON DIOXIDE

MATERIALS REQUIRED FOR PHOTOSYNTHESIS?

THE RAW MATERIALS NEEDED FOR THIS PROCESS ARE WATER , MINERALS , CARBON DIOXIDE AND SUNLIGHT.

FACT

LEAVES ARE ALSO KNOWN AS THE KITCHEN OF PLANT.

HOW PLANTS BREATHE?

LEAVES HAVE TINY PORES ON THE SURFACE WHICH CAN BE ONLY SEEN BY A MICROSCOPE . THESE PORES ARE CALLED STOMATA. AIR ENTERS THE LEAVES THROUGH STOMATA.

HOW IS OXYGEN RELEASED ?

ONCE ALL THE INGREDIENTS ARE COLLECTED , LEAVES PRODUCE FOOD IN THE FORM OF SUGAR OR GLUCOSE. OXYGEN IS RELEASED AS A BY-PRODUCT OF THE PHOTOSYNTHESIS.

OBSERVE THIS EXPERIMENT

Multiple Choice

WHAT IS THE CONCLUSION OF THE ABOVE EXPERIMENT

• LIGHT IS NECESSARY FOR PHOTOSYNTHESIS

• LIGHT IS NOT NECESSARY AT ALL

• LIGHT IS NOT USED IN PHOTOSYNTHESIS

LEAF - THE FOOD FACTORY

LEAVES ARE MOSTLY BROAD AND FLAT GREEN STRUCTURES OF PLANTS BUT THEIR IS A GREAT VARIETY IN THEIR SHAPES AND SIZES.

PARTS OF A LEAF

CAN U SEE THIS THE FLAT BROAD PART OF THE LEAF IS KNOWN AS THE LEAF BLADE. IN THE MIDDLE OF THE LEAF IS THE MAIN VEIN.

HOW DO PLANTS GET WATER ?

THE ROOT IS THAT PART OF THE PLANT WHICH REMAINS UNDER THE SOIL. ROOTS NOT ONLY FIX THE PLANT FIRMLY TO THE GROUND BUT ALSO SOAK WATER AND MINERALS FOR THE PLANTS.

HOW ARE FOOD , WATER AND MINERALS TRANSPORTED FROM ONE PLACE TO ANOTHER?

THE STEM GROWS ABOVE THE GROUND . IT BEARS BRANCHES ON WHICH LEAVES AND FLOWERS GROW.

Multiple Choice

IF WE ADD FOOD COLOR TO WATER AND PLACE A WELL ROOTED PLANT IN IT WHAT WILL HAPPEN ?

• THE LEAVES AND THE STEMS WILL BECOME RED

• THE PLANT WILL BE DEAD

STORAGE OF FOOD

THE FOOD PREPARED BY PHOTOSYNTHESIS IS IN THE FORM OF GLUCOSE . IT IS A KIND OF SUGAR AND IS CONVERTED INTO STARCH BY PLANTS .

IS STARCH PRESENT IN A GREEN LEAF?

YES IT CONTAINS STARCH IF YOU DO AN IODINE TEST THE LEAF WILL TURN BLUE - BLACK BECAUSE OF PRESENCE OF SR=TARCH IN IT.

WHAT WOULD HAPPEN O THE PLANT IF THERE WAS NO SUNLIGHT?

COVER A LEAF OF THE PLANT WITH BLACK TAPE AND DO IODINE TEST TO TEST FOR STARCH . THE LEAF DOES NOT TURN BLUE - BLACK BECAUSE THE LEAVES WERE COVERED HENCE COULD NOT GET SUNLIGHT AND CANNOT PREPARE FOOD .THEREFORE , WE SEE SUNLIGHT IS NECESSARY FOR PLANTS TO PREPARE FOOD.

Multiple Choice

IF WE ADD FOOD COLOR TO WATER AND PLACE A WELL ROOTED PLANT IN IT WHAT WILL HAPPEN ?

• THE LEAVES AND THE STEMS WILL BECOME RED

• THE PLANT WILL BE DEAD

LET'S DO A QUICK RECAP

THANK U

MADE BY SIDDHI GARG

WILL UPLOAD MORE STAY TUNED