worksheet. 5. sexual reproduction in plant

7/21/2019 Worksheet. 5. Sexual Reproduction in Plant

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SMPK1 BPK Penabur Bandung Name:

Learning Resource Number:

BIOLOGY Group:

Sexual Reproduction in Flowering Plant

I. Objective To observe the structure of a ower and identif the function of ever parts.

II. !pparatus and materia"s

# $ibiscus ower or an other ower# %orceps# &ounting need"e# &icroscope# Luv# Object g"ass# 'over g"ass# Ra(or or cutter# )etri dish

# *ugar so"ution



#III. Theor

# Reproduction in p"ants ta+es p"ace in a variet of was. This activit studiesthe reproduction process in owering p"ants that begins with a fower. The processof se,ua" reproduction in owering p"ants ta+es p"ace in the ower which is acomp"e, structure made up of severa" parts. &ost owers have four major organs:petals- sepals- stamens- and pistils. *ome owers are incomp"ete and do not

have a"" four organs. %or e,amp"e the suash p"ant has separate ma"e and fema"eowers- with the ma"e owers having stamens but no pisti"s and the fema"e owershaving pisti"s but no stamens. *ome parts of the ower such as the stamens andpisti"s are direct" invo"ved in ferti"i(ation and seed production. Other parts such asthe peta"s and sepa"s are not part of the se,ua" reproduction process but ma beessentia" to attracting a speci/c bird- bat- or insect to po""inate the ower.# %or man p"ants- pollination is an important step towards se,ua"reproduction. )o""ination is the transport of po""en from the anther of a ower to thestigma of 0usua"" another1 ower. )o""en is produced on the anther. )o""en isbrought from one ower to another b wind- insects- birds- or other such vectors.Once po""en "ands on the stigma of a ower- po""ination is comp"ete. $owever-

se,ua" reproduction has et to ta+e p"ace. Thus- there is a di2erence betweenpo""ination and ferti"i(ation- the union of egg and sperm.# To comp"ete reproduction- the sperm ce""s in the po""en grain must betransported down the st"e and brought to the egg ce"" within the ovar. This is the job of the tube ce""- another part of the po""en grain. The tube ce"" e,pands 0itdoesn3t divide1 with the sperm ce""s he"d at its tip. It e,pands down the fu"" "engthof the st"e 0sometimes uite a distance: the "ong tasse"s on ears of corn arest"es1 unti" it reaches the opening of the ovar- and deposits the sperm ce""s atthe egg- or ovu"e. Fertilization has occurred when one sperm ce"" unites with oneegg ce"".#

I4. )rocedurea. Observe the ower as a who"e- point and name the parts of the ower.b. 'ut the ower "ongitudina"" and separate the stamen and pisti". 5raw both stamen and

pisti" then draw them in the observation part.c. &a+e a fresh s"ide of po""en using g"ucose so"ution as the medium. Observe it under the

microscope and draw the po""en.######

##

4. Observationa. Labe" the who"e ower diagram be"ow.



#b. *tamen- pisti" and po""en.

#

# *tamen # # )isti" # # )o""en

#4I. 6uestions

#7. The ma"e part of the ower is ca""ed 8888888888888888888- this structure is divided into

88888888888888888 and 88888888888888888. The fema"e part of the ower is ca""ed

88888888888888888- this structure is divided into 8888888888888888888- 888888888888888888-

and 8888888888888888888.#

9. The process in which the po""en touch the stigma is ca""ed 888888888888888888. The

process in which the po""en touch the stigma of another p"ant from the same species

but di2erent in variet is ca""ed 888888888888888888888888888888888888. The fusionbetween ma"e and fema"e gametes in the ower is ca""ed 8888888888888888888.

#####. Observe the image of the owers be"ow.



#a. ;hich ower is a wind#po""inated ower<

# 888888888888888888888888888888888888888888888888888888888888888888888888888888

8888 b. *tate three characteristics of wind#po""inated owers.

# 8888888888888888888888888888888888888888888888888888888888888888888888888888888 # 8888888888888888888888888888888888888888888888888888888888888888888888888888888

# 8888888888888888888888888888888888888888888888888888888888888888888888888888888 c. Give one e,amp"e of wind#po""inated ower.

# 888888888888888888888888888888888888888888888888888888888888888888888888888888

8888 d. ;hich ower is insect#po""inated<

# 888888888888888888888888888888888888888888888888888888888888888888888888888888

8888 e. *tate two characteristics of insect#po""inated ower.

# 8888888888888888888888888888888888888888888888888888888888888888888888888888888 # 8888888888888888888888888888888888888888888888888888888888888888888888888888888

f. Name three insect#po""inated owers.

# 888888888888888888888888888888888888888888888888888888888888888888888888888888 8888 #

#4II. 'onc"usion

# 8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 # 8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 # 8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 # 8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 #

worksheet. 5. sexual reproduction in plant

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