The inner wall of pollen grains is made up of
Sporopollenin
Cellulose and pectin
Peptidoglycan
Cellulose only
The pollen grains are shed at two-celled stage in
80% angiosperms
40% angiosperms
30% angiosperms
60% angiosperms
Which among the following is referred to as male gametophyte?
Stamen
Anther
Pollen grain
microsporangia
Which among the following is incorrect with respect to vegetative cell of pollen grain?
It has irregularly shaped nucleus.
It has abundant food reserve.
It is spindle shaped with dense cytoplasm.
It is bigger as compared to generative cell.
A, B, C and D in the following diagram respectively are:
Epidermis, endothecium, middle layers, tapetum
Epidermis, middle layers, PMC, tapetum
Endothecium, middle layers, microspore mother cells, tapetum
Epidermis, middle layers, tapetum, PMC
Match the following:
1
Male gametophyte
I
Embryo sac
2
Female gametophyte
II
Ovule
3
Megasporangium
III
Pollen grains
4
Microsporangium
IV
Pollen sacs
1-III ; 2-I ; 3-II ; 4-IV
1-I ; 2-II ; 3-III ; 4-IV
1-IV ; 2-III ; 3-II ; 4-I
1-III ; 2-II ; 3-I ; 4-IV
The following figure represents :
Transverse section of young anther
3-D cut section of mature anther
Cut section of filament
Transverse section of mature filament
The diameter of pollen grain generally varies from:
40-50 micrometers
25-50 micrometers
10-12 micrometers
8-25 micrometers
The outer layer exine is made up of:
Cellulose
Which among the following is not a characteristic feature of sporopollenin?
Sporopollenin is one of the most resistant organic material known.
It can withstand high pressures.
No enzyme that degrades sporopollenin is known.
The exine exhibits a fascinating array of patterns and designs.
Self-incompatibility:
I. Is a device to prevent inbreeding
II. Provides a biochemical block to self-fertilization.
III. Ensures cross-fertilization.
IV. Is governed by pollen-pistil interaction
V. Is governed by series of multiple alleles.
VI. Prevents self pollen (from the same flower or other flowers of the same plant) from fertilizing the ovules inhibiting pollen germination or pollen tube growth in the pistil.
All are correct
All are wrong
Only I, II, III are correct
IV and V are wrong
Which of the following options is correct?
The events – “from pollen deposition on stigma until pollen tubes enter the ovule" are together referred to as pollen-pistil interaction
Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen
Pistil has no ability to recognize the pollen, whether right or wrong type
In double fertilization total number of male nuclei and total number of female nuclei involved are:
3, 2 respectively
2, 3 respectively
2, 2 respectively
3, 3 respectively
Identify A, B and X :-
X contains two cells - A and B. B is bigger than A, it has abundant food reserve and large irregularly shaped nucleus. A is small and floats in the cytoplasm of B. It is spindle shaped with dense cytoplasm and nucleus.
A
B
X
(1)
Vegetative cell
Generative cell
(2)
(3)
(4)
Filament
Which among the following is not true about pollen grain?
Rich in nutrients.
Many species cause severe allergies and bronchial afflictions in some people often leading to chronic respiratory disorders– asthma, bronchitis, etc.
Pollen consumption has been claimed to increase the performance race horses.
Parthenium is used against pollen allergy.
Pollen grain of which among the following lose viability within 30 minutes?
Wheat
Rosaceae
Leguminoseae
Solanaceae
Which among the following is not a feature of pistil?
Monocarpellary
Syncarpous
Monosporic
Apocarpous
Cryopreservation is a technique to preserve substances like pollen grains in liquid nitrogen at temperature
–150 °C
77.15 K
–210 °C
110 K
A, B, C, D in the following diagram respectively are:-
Hilum, funicle, inner integument, micropyle
Hilum, funicle, outer integument, micropyle
Funicle, outer integument, nucellus, chalazal pole
Funicle, outer integument, nucellus, micropylar end
Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wall layers perform the function of protection and help in the dehiscence of anther to release the pollen?
Epidermis, tapetum, endothecium
Epidermis, aril, endothecium
Epidermis, endodermis, mesocarp
Epidermis, middle layer and endothecium
Which of the following points is incorrect about sporopollenin?
It can withstand high temperature and strong acids and alkali
2 enzymes that degrade sporopollenin are known so far
Pollen grains are well preserved as fossils because of presence of sporopollenin
The above diagram shows some stages in microgametogenesis. Identify A, Band C: A B C
Symmetric spindle Vegetative cell Generative cell
Asymmetric spindle Vegetative cell Generative cell
Asymmetric spindle Generative cell Vegetative cell
Which of the following statements is false?
I. Pollen grains represents male gametophyte
II. In angiosperms partially developed male gametophytes are pollinated
III. Generative cell is siponogenous while vegetative cell is spermatogenous
IV. Formation and differentiation of pollen grains is called microsporogenesis
V. Hay fever is a pollen allergy
VI. Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
VII. Pollen grains are poor in nutrients.
I and VII
III and VII
IV and V
VI and VII
The viability of pollen grains depends upon:
Prevailing humidity
Genetic potentiality of the concerned species
All of the above
Which of the following has the least pollen viability?
Cereals like wheat and rice
Members of Rosaceae
Members of Leguminoseae
Members of Solanaceae
Match the Column-I with Column-II: Column-I Column-IIA. Funicle I. Mass of cells within ovule with more food B. Hilum II. Basal part of ovuleC. Integument III. One or 2 protective layers of ovuleD. Chalaza IV. Region where body of ovule fuses with funicleE. Nucellus V. Stalk of ovule
A - V, B - IV, C - III, D - II, E - I
A - IV, B - II, C - I, D - III, E - V
A - I, B - III, C - V, D - II, E - IV
Identify A, B, C and D structures shown in above diagram of female gametophyte:
C
D
1.
Synergid
Polar
nuclei
Central cell
Antipodal
cells
2.
Synergids
3.
Megaspore
mother cell
4.
Filiform
apparatus
cell
Geitonogamy is:
Genetically it is similar to autogamy since the pollen grains come from the same plant
Functionally and genetically autogamy
Both (a) and (b) are correct
Go through the following statements:
Flowers are bisexual and homogamous maturing anther and stigma of a flower at the same time.
Mechanical devices bringing anthers and stigma close together in a bisexual chasmogamous flower.
Cleistogamy (bisexual flowers remain closed)
Anther and stigma of an intersexual flower mature in bud condition.
The above contrivances favour:
Allogamy
Autogamy
Xenogamy
Cross pollination
a. Flowers are small. They are often packed in inflorescence
b. Flowers are colourless, nectarless and odourless
c. Well exposed stamens
d. Pollen grains - produced in large number, light, non-sticky
e. Flowers often have a single ovule in each ovary
f. Stigma - large, often feathery.
Self pollination
Anemophily
Ornithophily
Entemophily
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