Cleistogamy is leadingover anthesis because
pollination agent is not required
it assures heterozygosity
it favours insect pollination
it allows xenogamy
Sporopollenin is a constituent of pollen exine.
It can be degraded by the action of
enzymes
high temperature
strong acids
cannot be degraded
The pollen grains of rice and wheat lose their viability in ___ minutes of their release.
30
10
60
90
After double fertilizaton, a mature ovule has
1 diploid and 1 haploid cell
1 diploid and 1 triploid cell
2 haploid and 1 triploid cell
1 haploid and 1 triploid cell
How many haploid nuclei are present in a mature pollen grain?
One
Two
Three
Four
What is the correct sequence of the formation of female gametophyte in angiosperms?
Nucellus, megapore tetrad, megaspore mother cell, megaspore, female gametophyte
Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte
Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte
Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte
Primary endosperm nucleus (PEN) is formed by the fusion of
2 polar nuclei + 1 synergid cell nucleus
1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleuus
2 polar nuclei + 1 male gamete nucleus
2 antipodal cell nuclei + 1 male gamete nucleus
Match column I with column II and select the correct option from the given codes.
Column - I
Column - II
A.
Parthenocarpy
(i)
Seed formation without fertilization
B.
Polyembryony
(ii)
More than one embryo in same seed
C.
Apomixis
(iii)
Seedless fruits without fertilization
D.
Somatic embryogenesis
(iv)
Embryo develops from a somatic cell
A - (iv), B - (ii), C - (iii), D - (i)
A - (iii), B - (ii), C - (i), D - (iv)
A - (i), B - (iv), C - (iii), D - (ii)
A - (ii), B - (iii), C - (i), D - (iv)
The following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.
A - Connective tissue, B - Pollen grains, C - Endothecium
A - Endothecium, B -Connective tissue, C - Pollen grains
A - Pollen grains, B - Connective tissue, C - Endothecium
A - Endothecium, B - Pollen grains, C - Connective tissue
Select the option that contains all plants which produce non-endospermic seeds.
Gram, Pea, Bean, Groundnut
Castor, Peanut, Orchid, Wheat
Coconut, Walnut, Wheat, Gram
Castor, Maize, Coconu, Orchid
Pollination in Rafflesia is occurred by
. carrion flies
. elephant
. bat
. crow
Censar mechanism of seed dispersal is found in
Papaveraceae
Liliaceae
Leguminosae
Rosaceae
Which one of the most common embryo sac in flowering plant?
Monosporic, 8 nucleated and 7 celled
Monosporic, 7 celled and 7 nucleated
Bisporic, 8 nucleated and 7 celled
Bisporic, 7 celled and 8 nucleated
When a fern plant is developed from its prothallus without fertilisation? This pehnomenon is an example of
parthenocarpy
apogamy
apospory
organogenesis
If a stock has 2n = 48 and scion microspore mother cell has 2n = 24; then root cell and the microspores will have .... chromosomes respectively.
12, 48
48, 12
24, 12
24, 96
A fertilized egg of a plant has 40 chromosomes. The number of chromosomes present in the microspore mother cell is
20
40
80
Feathery stigma belongs to
wheat
pea
Datura
Caesalpinia
The normal type of embryo sac is 8-nucleated and
8-celled
7-celled
6-celled
5-celled
Embryo sac is
megaspore
microgametophyte
female gametophyte
megasporangium
The pollination of two flowers on different plants is known as
xenogamy
geitonogamy
cleistogamy
dichogamy
In some seeds, reminants of nucellus are also presistent. This residual, persistent nucellus is the
pericarp
perisperm
chalazosperm
mesosperm
Which among the following is attached to the proximal end of filament?
Stamen
Anther
Petal
Pollen sac
What is the number of microsporangia in each lobe of an angiosperm anther?
Eight
Which among the following extend longitudinally to become pollen sac?
Microsporangia
Filament of anther
Tapetum
Endothecium
Which among the following is not a feature of anther?
Bilobed
Dithecous
Apocarpous
Tetragonal
Which among the following is not a wall layer of microsporangium?
Nucellus
Middle layers
All of the following statements are correct except:
The proximal end of the filament is attached to the thalamus or the petal of the flower.
The anther is a four-sided structure consisting of four microsporangia, two in each lobe.
The number and length of stamens are variable in flowers of different species.
In a longitudinal section, a typical microsporangium appears near circular in outline.
Which among the following statement is incorrect with respect to tapetum?
It nourishes developing pollen grains.
It has dense cytoplasm.
It is the innermost wall layer of microsporangia.
Cells have single nucleus only.
How tapetal cells become binucleate?
Meiosis-I
Mitosis
Endomitosis
Eumitosis
Which among the following is incorrect with respect to microsporogenesis?
The cells of the sporogenous tissue undergo mitotic divisions to form microspore tetrads.
Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell (PMC).
The microspores are arranged in a cluster of four cells called as the microspore tetrad.
Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.
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