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UNIT 1: LIFE ENERGY

ACTIVITY 1: Leaf reaction when exposed to sunlight

MATERIALS

Leaf exposed to sunlight

bleaching solution

2 pieces lter paper (9cm x 15cm)

Masing tape

!ammer

"odine solution

2 petri dishes#ar of water

$orceps

%ropper

2 pieces &in'l tile (1cm x 15 cm)

leaf from the same plan co&ered fromsunlight

Procedure

1 #oin two pieces of &in'l tile along one side with masing tape to mae lterpaper holder

2 *ut the exposed leaf between 2 pieces of lter paper and insert the wholething in the lter paper holder

+ ,lose the folder -ith a hammer. pound it about 1 times o&er the areawhere the leaf is

/ *eel o0 the leaf from the lter paper he lead will lea&e an imprint on thelter paper

Question 1: w!t is te co"or o# te "e!# i$%rint&Question ': w!t do (ou tin) is tis co"ored su*st!nce&

5 *ut the pieces of lter paper in a petri dish or a bowl lled with bleachingsolution

-hen the color is gone. rinse the 2 pieces of lter paper in a 3ar of water4 ransfer one lter paper to another petri dish or bowl *our diluted iodine

solution all o&er the lter paper %o the same procedure for the other lterpaperQuestion +: w!t !%%ens to te co"or o# te "e!# i$%rint&

6epeat steps 1 to 4 using the colored leaf

Question ,: do (ou notice !n( c!n-e in co"or o# te ."ter %!%er&

-hen iodine solution changes in color from brown to blue. blue. blac or&iolet or purple. it shows the presence of starch

Question /: w!t c!n (ou in#er #ro$ te co"or o# te "e!# i$%rint&Question 0: does te coered "e!# cont!in st!rc& 2( do

(ou s!( so& Question 3: !ccordin- to tis e4%eri$ent5 w!t do%"!nts in sun"i-t %roduce&


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Su$$!r(:

7ll organisms need energ' which the get from the food the' eat

hrough the process of photos'nthesis. plants and other chloroph'll bearingorganisms produce food for themsel&es. which is a&ailed of b' other li&ing

forms *hotos'nthesis occurs in the chloroplasts found in their lea&es

hree ma3or steps in photos'nthesis are:8 ,apture of energ' from sunlight b' chloroph'll molecules8 ,on&ersion of light energ' to chemical energ'8 torage of chemical energ' into glucose sugar from 7* 7;%

;7%*!

Potos(ntesisis the process b' which plants. some bacteria and someprotistans use the energ' from sunlight to produce glucose from carbondioxide and water his glucose can be con&erted into p'ru&ate whichreleases adenosine triphosphate (7*) b' cellular respiration water glucose > ox'gen

7s light intensit' increases. the rate of the light8dependent reaction. andtherefore photos'nthesis generall'. increases proportionatel' 7s light

intensit' is increased howe&er. the rate of photos'nthesis is e&entuall'limited b' some other factor ,hloroph'll a is used in both photos'stems hewa&elength of light is also important *" absorbs energ' most e?cientl' at4 nm and *"" at nm Light with a high proportion of energ'concentrated in these wa&elengths will produce a high rate ofphotos'nthesis

7n increase in the carbon dioxide concentration increases the rate at whichcarbon is incorporated into carboh'drate in the light8independent reactionand so the rate of photos'nthesis generall' increases until limited b' anotherfactor

*hotos'nthesis is dependent on temperature "t is a reaction catal'sed b'en@'mes 7s the en@'mes approach their optimum temperatures the o&erall

rate increases 7bo&e the optimum temperature the rate begins to decreaseuntil it stops


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7AMA; BC"D

;7MA: EEEEEEEEEEEEEEEEEEEEEEEEEEEEEE ,L7:EEEEEEEEEEEEEEEEE %7A:EEEEEEEEEEEEEEEEE

Multiple ,hoice

Ancircle the letter that best completes the statement or answers the =uestion

1 Most of the energ' used b' life on Aarth comes from thea rotation of the Aarth b moon c weather d sun

2-here do plants get the carbon dioxideneeded for photos'nthesisF a water b the sunc the air d glucose

+ ,hloroph'll is green becausea it absorbs green wa&elengths

b it reGects green wa&elengths of lightc of an optical illusion

caused b' transmitted light d it absorbsblue and 'ellow wa&elengths. which maes green

/ ,ellular respiration occurs ina animals onl' b plants onl' c animals and plants d

bacteria onl' 5 Light energ' is con&erted to chemicalenerg' through the process of a photos'nthesis

b gl'col'sis c cellular respiration d fermentation -hich of thefollowing do not carr' out photos'nthesisF

a plants b certain proar'otes c algae d animals4 *lants produce what two products in photos'nthesisF

a carbon dioxide and ox'gen b ox'gen and glucose c

glucose and carbon dioxide d nitrogen and glucose -hat is 7*F a 7n energ'

source for plants b acompound created b' the smooth endroplasmic reticulum

c an energ' source for animalsd an energ' source for both plants and animals9 -hat is the name of the sugar that is formed during

photos'nthesisF a fructose b sucrose c glucosed lactose

1 -hich of the following is a factor that can a0ect can a0ectphotos'nthesisF a too much water b too little ox'gen

c too much sun d too little glucose

answers

1 7;: %2 7;: ,+ 7;: H/ 7;: ,5 7;: 7


5/12

7;: %4 7;: H 7;: %9 7;: ,1 7;: ,

LESSON 2: BIODIVERSITY

ACTIVITY 1:,onser&ing Hiodi&ersit' in the ,ommunit'

7s a citi@en of the world. the Cnited ;ations An&ironmental *rogram (C;A*) hasmade the following suggestions to help conser&e biodi&ersit' in the communit'

1)-hich of these suggestions can 'ou doF

"n a piece of paper. indicate 'our answer b' checing the column. IA or ;

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