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# EFFECT OF LIGHT INTENSITY ON THE GROWTH OF PLANT.

Extracts from this document...

Introduction

IB BIOLOGY HL CANDIDATE NUMBER- EFFECT OF LIGHT INTENSITY ON THE GROWTH OF PLANT. AIM: TO INVESTIGATE THE FACTORS AFFECTING LEAF SIZE IN WILD CHERRY PLANT 1. DESIGN: RESEARCH QUESTION: WHETHER THE LIGHT INTENSITY CAN INFLUENCE THE GROWTH OF THE LEAF OF WILD CHERY PLANT? HYPOTHESIS: My prediction is that plant exposed to/ growing in the region of bright light has a leaf with more surface area(longer and wider),compared to the one growing in a shaded area which would be shorter in length and width(lesser surface area), based on my knowledge that light is a factor affecting the growth of plants,thus in this case it would be a limiting factor for those plants in shaded areas. VARIABLES: A.)INDEPENDENT VARIABLE: In this case,the indepent variable would be the different area's/regions the plant is taken from,as one is taken from an area of bright light and the other from a shaded area. ...read more.

Middle

* Take a sample of 30 leaves from the branch of the bright area.(the sample has to be done randomly(some small leaves and some larger ones as well),take different sizes of leaves(length and width.)but from the same branch/tree. * Then measure and record the length and width in millimeters using a ruler of each leaf from the bright area. * Then calculate and record the surface area of each of these leaves by multiplying its length by its width and dividing the product by two. * REPEAT THE 2ND,3RD,4TH PROCESSES FOR THE BRANCH FROM THE WILD CHERY PLANT IN A SHADED AREA. * After that , compare both the findings/data of surface area-from the bright area and shaded area. * 2.DATA COLLECTION AND PROCESSING: 1.QUANTITATIVE RAW DATA: TABLE 1. PLANTS EXPOSED TO BRIGHT AREA:--- TABLE 2,PLANTS EXPOSED TO SHADED AREA: 2.AND 3)PROCESSED DATA AND PRESENTATION OF PROCESSED DATA: TABLE 3-AVERAGE(MEAN) ...read more.

Conclusion

II.)EVALUATES WEAKNESSES AND LIMITATIONS: AGE OF PLANTS(SAMPLES) MAY VARY, WHICH MAY BE A FACTOR AFECTING THE HEIGHT ,LENGTH ,ETC.AS BOTH SAMPLES MAY BE IN A DIFFERENT GROWTH PERIOD(AGE.) WE HAD ONLY SELECTED 2 SAMPLES(BRANCHES),SO THESE TWO SAMPLES MAY NOT GIVE A WHOLE PICTURE TO COMPARE HOW THE LIGHT INTENSITY AFFECTS ITS GROWTH. WE HAD ONLY SELECTED 1 SPECIES.-WILD CHERRY PLANT, AND THIS RESULT MAY VARY WITH DIFFERENT SPECIES OF PLANTS. III.)SUGGEST REALISTIC IMPROVEMENTS: NEXT TIME MAKE SURE THAT WE SELECT BOTH SAMPLES FROM THE SAME AGE GROUP/STAGE OF GROWTH. WE SHOULD ALSO COMPARE OUR RESULT WITH USING SOME OTHER SPECIES,NOT ONLY USING A WILD CHERRY PLANT INCLUDE MORE SAMPLES AS WELL,NOT ONLY 2 ,ONE FROM BRIGHT LIGHT, AND ONE FROM SHADED AREA , WE SHOULD TAKE ATLEAST 2 FROM EACH ,SO 60 LEAVES FROM BRIGHT AREA, AND 60 FROM SHADED AREA. ?? ?? ?? ?? ...read more.

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