SEXUAL REPRODUCTION IN FLOWERING PLANTS
2010 MARCH
1.
Given
below in the diagram showing the transfer of pollen grains.
a. Identify a & b with technical terms.
b. Critically evaluate a & b
2. Raman is learning the post fertilization
changes of an angiosperm embryo sac with the help of slides. He identified the
egg nucleus and polar nuclei with the help of his teacher. (3)
a. Name the other nuclei present in the
embryo sac.
b. Help Raman by giving the changes that
takes place with egg nucleus and polar nucleus after fertilization.
2010 SAY
1. Microsporangium is generally surrounded
by four wall layers. Name the layer which nourishes developing pollen grains. (1)
2. Match the following: (4)
A B
Pollen Monocarpellary
Monoecious Diploid
Endosperm Embryo sac
Female
gametophyte Halpoid
Male and female flower on same plant
Triple
fusion
2011 MARCH
1.
Copy the picture given above and mark the
following:
a. Connective tissue b. Endothecium
c. Tapetum d. Sporogenous tissue (1)
2. After fertilization in flowering plants,
seeds bearing embryos are found inside the fruits. If seeds are developed from
ovules.
a. Name the parts that given rise to embryo
and fruits.
b. What is the thick wall of the fruit that
is protective in function called? (1½)
3. Transfer of pollen grains from the anther
to the stigma of a flower is called pollination. Grass plants generally have
small, inconspicuous flowers while plants belonging to many angiosperms
families bear conspicuous coloured flowers.
a. Comment on the type of pollination taking
place in these two groups.
b. What are the salient features present in
these two groups for effective pollination? (3)
2011 SAY
1. +2 students of a school at Kasaragod
district on their study tour collected flowers showing the following character:
1)
Flowers are with light pollen grains
2)
Colourful flowers
3)
Nectar producing flowers
4)
Flowers with feathery stigma
a. Arrange the characters under different
pollination groups in the given table.
b. Write the name of 2 flowers pollinating
through water. (3)
|
Entemophilous flowers
|
Anemophilous flowers
|
|
………………………
………………………
………………………
|
………………………
………………………
………………………
|
2012 MARCH
1.
In Maize, the chromosome number present in the
meiocyte is 20. Give the number of chromosomes present in the following:
a.
Maize pollen b. Maize endosperm (1)
2.
Copy the picture given below and mark the following:
(2)
a.
Hilum b. Funicle c. Micropylar pole
d. Nucellus e.
Chalazal pole f. Embryo sac
2012 SAY
1. Innermost wall layer of microsporangium
which nourishes the developing pollen grain called ………. (1)
2. In Papaya, male and female flowers are
present in separate plants. They are said to be ………….. (1)
3. In large number of plants, pollination is
carried out by insects. List four characters of flowers that help insect
pollination. (2)
4. In artificial hybridization, it is
important to make sure that stigma is protected from unwanted pollen. This is
achieved by emasculation & bagging techniques. Can you explain how
emasculation & bagging techniques are performed? (2)