Wu 1 Observing Plant Growth V i a Correlation to Various Color Light Exposure. Chao L. Wu IB Biology 1 ! "pril #1!
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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 "
$ed
Original Mass (g) New Mass (g) Grams Increased
Average Increase
(g)
02" 055 02# 02"023 04# 02"
025 05 025
03 05" 02"
034 05% 024
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Wu !
&l'e
Original Mass (g) New Mass (g) Grams Increased
Average Increase
(g)
02 034 014 013%03 043 013
023 03! 014
02# 044 015
025 03% 013
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Wu %
Green
Original Mass (g) New Mass (g) Grams Increased
Average Increase
(g)
02! 034 00! 00%203 03% 00%
01# 02! 00%
02% 035 00!
02# 04 011
)ata 7n(ertainties% =>, #.##/?
)ata (hanges within the *ass o' the navy bean see$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.