Observing Plant Growth Via Correlation to Various Color Light Exposure

5/19/2018 Observing Plant Growth Via Correlation to Various Color Light Exposure

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Wu 1

Observing Plant Growth Via

Correlation to Various Color

Light Exposure.

Chao L. Wu

IB Biology 1

! "pril #1!


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Wu 2Hypothesis: Exposure to blue light will cause plants to be able to utilize more of the rays, thus

increasing energy production and increasing its rate of growth.

In$epen$ent Variable% &ass o' plants a'ter exposure to $i''erent light (olors.

)epen$ent Variable% Exposure ti*e.

Control% +ee$s expose$ to non,(olore$ light.

Materials:

- hree /##*L Bea0ers

- Bla(0 (overing to (over top o' (ha*ber

- Potting soil *ix

- Plant starter (ontainer with *esh an$ $irt

- Water

- luores(ent Light sour(e

- ransparent Plasti( Light )i''usion +heets 2Blue3 4e$ an$ Green5

- "t least two $o6en navy bean plants

- +(ale

- 1##*L gra$uate$ (ylin$er

- &ar0er

- &as0ing tape

Method:

1. &easure out a spe(i'i( a*ount o' potting soil *ix or use a *eshe$ starter.

. 7sing the s(ale3 *easure out the initial *ass o' ea(h o' the bean see$s.

8. 4e(or$ the *ass with the *ar0er onto the 'oa* *esh starter.

!. Pla(e a single bean see$ within the *eshe$ starter. 4epeat 1! other ti*es.


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Wu 3/. Wrap the transparent plasti( light $i''usion sheets onto the three $i''erent bea0ers with

ea(h bea0er having a $i''erent (olor.

9. +e(ure the sheets with tape.

:. +e(ure the 'luores(ent la*p an$ point it si$eways 2pi(ture shown below5

;. Put the 'oa* *esh starters into the (enter o' the (ontainers.


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Wu 4Pictures:


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Wu 5Data Collecting and Processing

Control

Original Mass (g) New Mass (g) Grams Increased

Average Increase

(g)

023 05! 034 0314

023 054 031

02" 053 02!

023 05# 03"

033 0"2 02#


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Wu "

$ed


Average Increase

(g)

02" 055 02# 02"023 04# 02"

025 05 025

03 05" 02"

034 05% 024


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Wu !

&l'e


Average Increase

(g)

02 034 014 013%03 043 013

023 03! 014

02# 044 015

025 03% 013


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Wu %

Green


Average Increase

(g)

02! 034 00! 00%203 03% 00%

01# 02! 00%

02% 035 00!

02# 04 011

)ata 7n(ertainties% =>, #.##/?

)ata (hanges within the *ass o' the navy bean see$s are *easure$ within #.#1 gra*s. @owever3

$ue to the li*itation o' the s(ale use$3 all *easure*ents will be roun$e$ to the hun$re$th gra*

*ar0. @ighest rate o' *ass in(rease goes to that o' the (ontrol group3 while the lowest rate o'

*ass in(rease goes to that o' the group expose$ to green light. Ensuring the (alibration o' the


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Wu #s(ale3 as well as the use o' 'resh navy bean see$s will 0eep the $ate *ore thorough. "lso3 ensure

the use o' the sa*e 0in$s o' soil 'or the experi*entation3 along with the sa*e variety o' see$s.

Conclusion:

)ue to the ti*e restraints an$ lengthy pro(ess o' ger*ination3 this $ata is as a((urate as possible

within the li*itations o' the lab. he 'reshness o' the see$s is i*portant. Ensuring that new see$s

2or see$ spe(i'i(ally pa(0age$ 'or planting5 will allow 'or 'aster ger*ination an$ thus3 spee$ing

the $ata (olle(tion. 7sing a s(ale within as *u(h signi'i(ant 'igures available (an also allow 'or

better a((ura(y within this parti(ular lab. inally3 it is (ru(ial to re*e*ber to 0eep the

A(ha*bers all (overe$ to prevent entran(e o' other sour(es o' light that (oul$ s0ew the $ata.

or this parti(ular experi*ent3 we are loo0ing at how exposure to $i''erent sour(es o' light (oul$

have a $i''erent e''e(t on the growth rate o' plants. "'ter planing the navy bean see$s within their

respe(tive (ha*bers3 the *ain part is to ensure that the soil is *oist enough to allow 'or

su((ess'ul ger*ination. "'ter 1./ wee0s3 the see$s are re*ove$ an$ weighe$. Over the (ourse o'

'ive $i''erent trials3 the result 'ro* this $ata set is uite (lear. It appears that the (ontrol group

ha$ the best growth rate3 with plants having a #.81!g in(rease in *ass over a perio$ o' 1./

wee0s. Dext are the plants expose$ to re$ light3 whi(h average$ a #.9g in(rease 'ro* planting to

ger*ination. ollow this are the plants expose$ to blue light3 whi(h average$ #.18;g in *ass

in(rease. inally3 the lowest *ass in(rease goes to the plants expose$ to green light. his group

average$ a *ere #.; over the (ourse o' 'ive trials. "((or$ing to (harts whi(h show rate o'

photosyntheti( rea(tion3 the highest a*ount o' rea(tion shoul$ be within the blue (olor range3

'ollowe$ by re$ then by green. While pure light allowe$ 'or a(tivation o' all (olors3 *y $ata $oes

not ne(essarily support this (ase. +i*ilarly3 *y $ata $oes not support the original hypothesis


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Wu 10$espite what shoul$ have o((urre$ a((or$ing to *any a(a$e*i( photosyntheti( rea(tion by (olor

(harts. his issue is a$$resse$ in the next se(tion.

Evaluation of Procedures:

Errors *ostly result 'ro* the use o' ol$ navy beans. he in$ivi$ual beans I use$ were sol$ as

'oo$ ite*s3 not see$s with the intention o' ger*ination. he pro(ess in whi(h the beans were

(olle(te$ *ay have wea0ene$ their ability to ger*inate. "lso3 $ue to the ti*e restraints3 only 'ive

trials were $evelope$ 'or ea(h o' the (olors. he last issue is with the photosyntheti( rea(tion

(harts as well as what really shoul$ have happene$ within *y $ata. Generali6ing3 the bulb I use$

'or the light was yellow in (olor3 this *ay have tinte$ the light to a *ore green (oloration as it

passe$ through the layer o' blue 'ilter. his *ay have lowere$ the photosyntheti( rate 'or the

plants were a(tually expose$ to a *ore green light.

he 'irst issue (oul$ be solve$ by using navy beans3 or other beans3 spe(i'i(ally sol$ 'or planting

purposes3 this (oul$ in(rease pro$u(tivity an$ ger*ination spee$. he se(on$ issue (an easily be

'ixe$ by having *ore ti*e3 thus allowing 'or *ore trials to in(rease $ata points 'or analysis.

inally3 the last issue (oul$ be 'ixe$ by using a white (olore$ light instea$ o' a yellow one. "s a

last note3 I woul$ li0e to *ention that this experi*ent (oul$ bene'it by allowing the see$s to

(olle(t real sunlight instea$ o' arti'i(ial light. hese (hanges (an ensure *ore pre(ise an$

a((urate results.

Observing Plant Growth Via Correlation to Various Color Light Exposure

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