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Chapter 5 Response in PLANTS.pptx
1. Chapter 6: Sexual Reproduction
in Flowering Plants
Name : Thanhya Phrassanna Naidu Puspakaran
Class : 5 Diamond
Class Teacher : Pn. Zawiyah bt. Othman
2. Formative Practice 6.1
1. The diagrambelow shows thestructureof aflower.
(a)Label partsA - F.
(b)Statethefunction of partsA - F.
A: anther
B:petal
C:filament
D:stigma
E :ovary
F:sepal
3. (b)A :Haspollen sacswhichcontain pollen grains(microspores)
B:Attractsinsectsandanimals
C:Stalk thatholds up theanther
D:Place wherepollination occurs
E :Female reproductive organ
F:Protectstheflower atbud stage.
2.Whyarestamensandcarpels knownasthereproductive organs of flowering plants?
Antherproduces malegametes(pollen grains)while carpel producesembryo sac.
3.Compare maleandfemale reproductive organs of flowers intermsof their:
(a) Names
(b) (b)Structuresthatform them
(c) (c)Functions
11. Formative Practice 6.5
1. Whyareseedsimportant to ensurethatplant speciesarenot extinct?
Seedscontainembryosthatwill germinatetoform newplants
2.Explain thefollowing statements.
(a) There are cotyledons inside aseed
(b) (b)Some plantshaveaverylarge numberof seeds
(a)Cotyledons supplyfood toseedlings before thepresenceof leavesfor photosynthesis.
(b)Increasethechancesfor seedgerminationtoensurethesurvivaloftheplantspecies.
3.Whydoesasexual reproduction produce cropsof lesserquality comparedtosexualreproduction
throughseeds?
Asexualreproduction producescropsthathavethesamefeatures astheparent,i.e. identical and
thereisnoadditional betterfeature Q.Sexualreproduction producesplants thatinheritfeatures
from twotreesthatproduce seedlingswhich arenot identical andof betterquality
12. Summative Practice 6
1. The stigmasecretesasugarysolution called nectar.Whatistheimportance ofthe
solution?
Stimulate thegerminationof thepollen grainsto form pollen tube.Makesthestigmasticky
andallows thepollen graintosticktoit.
2.The formation ofpollen grains involves thedivision of cellsbymeiosis andmitosis.Statethe
importance ofboth processes.
Meiosis –Produces haploid gametecells
Mitosis –Increasesthenumberof nucleusto develop into pollen grains
3.In somespecies,thepetalsarenot included inthereproductive structureof theflower, but
theyareveryimportantinensuring thatreproduction occurs.Why?
The colour of thepetalscanattractpollinating agents
13. 4.Flower Xispollinated byinsects.Statetheposition of theantherandstigmaoftheflower.
Explain your answer.
Located inside thepetals.This ensurestheinsectsthatentertheflower for nectarwill come
intocontact withpollen grains andtransfer themtothestigma.
5.Lalang producesdull-coloured flowers without nectar.However, itisveryeasyfor thisplant
toreproduce. Explain.
Lalang hasmanypollen grainswhich arelight.This feature enable thepollen grainsareeasily
dispersedbythewind.
6.Mr.Sureshisafarmer whogrows long beans.Mr. Sureshoften letsthefruits from someof
thetreestomatureanddries themtomakeseeds.Suggestone wayto storetheseedsso that
theylastlonger.
14. Stored inanairtight container andwiththeabsenceof water.The seedscannot germinate
without air andwater. This enablesseedstobestored for along time
7.Atreehasproduced twoflowers. However, thetreewasattackedbyatypeof fungus that
damagedthestructureof itsstigma.Thishasdisruptedthedivision of thegenerativenucleus
inthestyle. Inyour opinion, canthistreeproduce fruits andseeds?Explain.
No. There isnogermination ofthepollen grainonthestigma,noformation ofpollen tube
8.Figure 1showstheconversationbetweenSalina andLiza.
15. Doyou supporttheopinion of Salina orLiza? Explain.
Liza.
-Coniferous trees/gymnospermsdo not haveflower buthaveseedsproducedbythecone.