The effect of light intensity to the Rate of Photosynthesis (Group 8)

FAISAL, Farhan A. BUCIO, Kyna Desiree E. GARRIDO, Nurissa M. POMOY, Rica Blanche C.

I. Objective

To investigate the

effect of light intensity to

the rate of photosynthesis

of aquatic plant.

II. MATERIALS

• AQUATIC PLANT

• WATER

• BASIN

• RULER

• WEIGHING SCALE

• LIGHT SOURCE

WEIGHINGPREPARATION OF

SETUPS DISTANCE MEASUREMENT

COUNTING OF BUBBLES

III. Method

1.)Materials were gathered.

2.) The aquatic plant was weighed

using the weighing scale.

3.)Water was measured.

4.) 2 set-ups were prepared.

a. Set up A – 10 g of aquatic plant was fully

submerged to a 700 ml of water. Then a

light source was placed close to the

container.

b. Set up A – 10 g of aquatic plant was fully

submerged to a 700 ml of water only with

room lighting.

5.) The light source on set up A was powered

on.

6. ) The distance of the light source on setup

A was varied

7.)The bubbles generated per minute by the

plants were counted thrice with an interval of

four minutes.

8.) Data were recorded.

IV. RESULTS

TABLE 1. SET UP A (with light lamp)

Bubbles per minute Distance of the light

source from the container

1st count 2nd count 3rd count Average

1 inch 22 20 24 22

6 inches 16 15 15 15.3

11 inches 10 12 11 11

1ST count 2nd count 3rd count

Average

Number Of Bubbles

8 5 8 7

TABLE 2. SET UP B (room lighting)

Bubbles per minute

DISCUSSION Table 1 showed the number of bubbles

produced by the aquatic plant when the distance of the light source was varied with an interval of 5 inches . Table 2 showed the number of bubbles generated by the aquatic plants under room lighting.

Graph 1 summarizes all the result showing that as the distance of the light increases (decreasing intensity) the rate of photosynthesis decreases.

V. CONCLUSION

The closer the light was to the

aquatic plant, the greater light intensity

it provided to it. This only says that

greater light intensity accelerated the

rate of photosynthesis as more bubbles

were able to form.