5.
The diagram below shows the fertilisation in a flower,
stigma
germination of
pollen grain
style
ova ry
definitive nucleus
generative nucleus
ovu le
pollen tube nucleus
ovum
pollen tube
micropyle
male gametes
(a)
Describe in details how this process takes place in the flower,
(b)
What would happen to the ovule and ovary after fertilisation?
n
o
i
t
a
c
u
Topical Practice Questions
Section A: Multiple-Choice Questions
L.
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Danyal Education
Reproduction in Plants Assignment 1
Which of the following plant structures contain haploid nuclei?
d
E
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a
y
n
a
A
pollen
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grains B
root tip
cells
C
sieve tubes
D
xylem vessels
BIOLOGY O LevelConceptual Learnlng I
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The diagram shows the flower of a common species of grass.
ati
on
2.
Which one of the following characteristics would likely be found on this flower?
3.
anthers with short
filaments
nectar
nectaries producing
B
D
small and smooth pollen grains
brightly coloured petals
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A
C
The diagram shows the main parts of a flower. Which labelled features, A, B, C or D, is the
best evidence that this is an insect-pollinated flower?
C
A
B
Pollination occurs when pollen grains are transferred to the
ny
4.
al
D
A anther.
A
C
214
C
D
stigma.
sepal
Which of the following route is taken by a pollen tube after pollination of a flower?
Da
5.
B ovule.
style
stigma -+ filament -+ ovule
filament -+ stigma -+
B
D
ovule -+ style
stigma
+
+
stigma
style --> ovule
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6.
The diagram shows the structure of an insect-pollinated flower,
2
ny
al
Ed
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ati
o
n
L
5
What are the numbered parts?
A
B
C
D
7
7
2
3
stigma
filament
carpel
style
anther
sepal
style
stigma
sepal
stigma
anther
carpel
The following information describes the events taking place during sexual reproduction in a flowering
plant.
L
anthers split open
2
pollen grain attaches to stigma
3
male gamete fuses with female gamete
4
growth of pollen tube
5
seed develop inside ovary
ln which order do these events take place?
Da
first+last
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B24135
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D42351.
8.
ln which part of the flower does fertilisation take place?
A anther
9.
B stigma
C
ovule
D
style
After fertilisation, which structure develops into the seed of a flowering plant?
A receptacle B sePal
C ovule
D
style
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BIOLOGY O LevelConceptual Learning I
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1-0. Which flower structure produces pollen?
A stigma
B
C
petal
D
carpel
anther
Section Br Short Answer Questions
7.
The diagram below shows the structure of a flower
4
ati
o
n
5
6
1,
7
B
10
uc
2
17
Which of the above two numbered structures contain haploid cells? Name these structures.
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(c)
Suggest the consequences to the plant if structures 5 and 7 were to be
(d)
(i)
Da
(i i)
removed.
l2m)
A mass of yellow grains is found in structure 4. what are they? Explain why they are
produced in a relatively large
quantity.
[2m]
The new plants that developed from the fusion of each pollen grain and ovum were
distinctly different. Explain why this sort of variation was
216
[3m]
Ed
(b)
Does this flower undergo insect- or wind-pollination? Give two reasons for your answer
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al
(a)
observed.
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(iii)
Assuming that the parental cell has two pairs of chromosomes, draw the possible types of
gametes that can be reproduced after meiosis takes
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place.
2
ati
o
n
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A student discovered a new plant growing in his backyard which he had never seen before. He
noticed that its flowers looked surprisingly like female bees. They had striking colours and gave off a
pungent smell of rotting meat.
[3m]
Suggest how these features help the plant carry out
pollination.
The student liked the plant so much that he decided to grow new daughters from the parent plant
asexually. Thefirst generation produced from the parent plantthrived well. Afteroneyear, however,
all the plants died suddenly. Suggest what may have happened to cause all the plants to die.
Ed
(b)
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(a)
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Section C: Free Response Questions
L. (a) Scientists have discovered a new species of plant. lt had brightly coloured flowers with a
ny
pollination.
fertilisation.
plant?
Da
(b)
(c)
pungent, rotting smell. Upon close inspection, it was discovered that the stamens and stigmas
were small. The flowers of the same plant had either stamens or stigmas. From the information,
suggest how this plant undergoes
[5m]
State the difference between pollination and
[2m]
ln many flowers, the pistils and stamens reach maturity at different times. Considering what you
know about pollination, why would this be an advantage to the
[2m]
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BIOLOGY O Level Conceptual Learning I
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