Azma amira bt mohamadNoor asyikin bt kamarazaman

Syanawiyyah bt Md ZinWan norfarhah bt wan harun.

The intensity of light is a factor which affects the rate of photosynthesis. Low light intensity would

produce a low rate of photosynthesis. An increase in light leads to a higher rate of

photosynthesis. Once the light intensity reaches 10 000 lux, the photosynthesis rate becomes

constant.

1-which plant is more fresh after several days??2- Why this happen?

plant cover by dark box plant not

cover by dark box

Plant A Plant BPlant A Plant B

Lamp

Time(mm:ss) CO2 I/O-1(ppm) CO2 I/O-2(ppm)

33:09:00 876.308 551.385

34:09:00 925.538 571.077

35:09:00 925.538 580.923

36:09:00 955.077 620.308

37:09:00 964.923 620.308

38:09:00 994.462 659.692

39:09:00 1024 649.846

40:09:00 1043.692 679.385

41:09:00 1073.231 669.538

42:09:00 1132.308 699.077

43:09:00 1132.308 689.231

44:09:00 1171.692 718.769

45:09:00 1211.077 708.923

46:09:00 1220.923 758.154

47:09:00 1280 748.308

48:09:00 1309.538 777.846

49:09:00 1358.769 777.846

50:09:00 1417.846 777.846

51:09:00 1447.385 797.538

52:09:00 1486.769 787.692

53:09:00 1545.846 807.385

54:09:00 1555.692 807.385

55:09:00 1604.923 836.923

56:09:00 1644.308 827.077

57:09:00 1664 846.769

Tabulated dataTabulated data

Time(mm:ss)33:09 38:09 43:09 48:08 53:08

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

Red line = high light intensity

Blue line = low light intensity

Compare the rate of dissolve oxygen for both of the plant.

Why the both graph keep increasing? What is the effect of light intensity

towards the rate of photosynthesis? State the another factor that

influence the rate of photosynthesis?

Plant in the house Plant at the backyard

The plant in the house is wilt while the plant in the backyard is healthy.

The color of the leaves of taro in the house turned to brownish after a few weeks while the taro in the backyard maintains its green color.

The stem of taro in the backyard is bigger and taller than the stem of taro in the house.

The results gain is more accurate rather than using manual method due to the same time interval

The experiment can be continued for many hours until the rate of photosynthesis reaching its optimum level. This experiment is almost impossible done by traditional method because students have to sit for many hours to count the O2 bubbles released by the elodea plant.

The change in photosynthesis cannot be detected by naked eyes but by using data logger, we can record the rate of photosynthesis every one minute per half an hour.

Using data logging, we can save the time by setting up more than one apparatus can be done simultaneously at the same time.