Download public exam_reproduction in flowering plants

ECF Saint Too Canaan College
Biology public exam exercise
Reproduction in flowering plants
Name: ___________________
Class: ______ (
)
Date: _____________________
CE 2000_I_Q.2(c)(i)
1. Under natural conditions, pea flowers are self-pollinated, i.e. the stigma receives pollen grains
from the same flower. Suggest one advantage and one disadvantage of this method of
pollination.
(2 marks)
CE 2001_I_Q.4(c)
2. The diagram below shows the structure of a flower:
(a) With reference to the diagram, state two observable features that suggest this flower is
insect-pollinated.
(2 marks)
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2.
(b) Some tiny grains from structure A were put in a 15% sugar solution. After 2 hours, the
grains were observed under the microscope. The photograph below shows one of these
grains:
(i)
Name structure D.
(1 mark)
(ii)
What is the function of structure D ?
(2 marks)
(c) What structures are formed from B and C respectively after fertilization ?
roles of these structures in reproduction.
Describe the
(5 marks)
CE 2007_I_Q.8(a)
3. The photographs below show the structure of a lily flower:
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(a) Label the following structrure:
R: ________________________________
(2 marks)
S: ___________________________
(b) State the method of pollination for this flower.
features from Photograph 1.
Support your answer with two observable
(3 marks)
(c) After pollination, describe how the male gamete meets the female gamete.
(4 marks)
(d) The lily plant can also reproduce asexually. What is this type of asexual reproduction ?
(1 mark)
AL 2002_I_Q.1(d)
4.
Bacterial cell reproduces by binary fission.
reproduction ?
Why is this process not a mode of sexual
(2 marks)
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DSE 2014_IB_Q.8
5. A primrose plant is a flowering plant that has two different types of flowers. Photograph I and
Photograph II show the appearances of the two types of flowers (P and Q) and Photograph III and
Photograph IV show the sections of the flowers respectively. Each primrose plant produces either
type P flowers or type Q flowers.
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5.
(a) Apart the presence of nectaries, give two observable features of type P flowers which support
the claim that the primrose is an insect-pollinated plant.
(2 marks)
(b) Butterflies collect nectar from flowers using a mouth structure in the form of a long sucking
tube
(1)
When a butterfly visits a type P flower, which part of the sucking tube will the pollen
grains stick to?
(1 mark)
(2)
When the same butterfly visits another flower, which type of flower will be more
readily pollinated? Why?
(2 marks)
(3)
What is the advantage of having the different positioning of anthers and stigmas in the
primrose?
(2 marks)
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ECF Saint Too Canaan College
Biology public exam exercise – Reproduction in plants answer
1.
Advantage:
The chance of pollination / fertilization is higher.
Less wastage of pollen grains.
Desirable characters of the parent are more likely to be transmitted to the offspring.
Disadvantage:
Less genetic variation (accept other correct answers)
1
(1)
(1)
1
(2)
2.
(a)
Any two of the following:
Presence of insect guide
Large petals
Stigma / anthers lie within the flower
Broad / club-shaped stigma
(b)
(i)
*pollen tube
1
(ii)
It carries the male gamete
to meet the female gamete in the ovule.
1
1
(c)
1+1
C will develop into the seed
1
which will form a new plant
1
B will develop into the fruit
which serves to protect the seeds
and helps in seed dispersal.
1
1
1
(10)
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3.
1
1
(a)
R: *filament
S: *ovary / ovule
(b)
Insect pollination

large / brightly coloured petal

anther / stigma located inside flower

presence of insect guide
(c)
Pollen grain develops to form a pollen tube.
Pollen tube carries the male gametes
down the style to the ovary / and digests the tissues of the style
and releases the male gametes into the ovule.
1
1
1
1
(d)
vegetative propagation
1
1
1
1
(1)
(10)
4.
It is not sexual reproduction because
． there is no exchange recombination of genetic material (1), between two parental
cells (1) only 1 parental cell is involved
． no fertilization / fusion of genetic material between 2 parent cells (1)
． no gamete formation (1)
1
1
(1)
(1)
(2)
5.
(a)

(b)
(1)
middle part (1)
(2)

coloured /large petals (1) and anther within the flower tube (1)

(3)


type Q flower (1)
because its stigma is located at the middle level of the flower tube (1)
which is at the same position where the middle part of the sucking tube
will touch upon
this ensures that pollination is done between different individuals (1)
so that the genetic variation of the offspring can be increased (1)
(2)
(1)
(2)
(2)
7
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