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Class 12 Biology
Sexual Reproduction In Flowering Plants
Quiz 2
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How many meiotic divisions are necessary to produce 100 pollen grains ?
0%
100
0%
50
0%
25
0%
20
Explanation
25
Double fertilization means:
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Fusion of two eggs
0%
Fusion of egg and pollen nuder of two pollen grains
0%
Fusion of two polar nuclei with one male gamete
0%
Fusion between synergid cells and male gamete
Explanation
Fusion of two polar nuclei with one male gamete
Pollination by bats is called:
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omithophily
0%
Entromophily
0%
Cheiropterophily
0%
Hydrophily
Explanation
omithophily
Pollination by snails is called:
0%
Malecophily
0%
Zoophily
0%
Anemophily
0%
Hydrophily
Explanation
Malecophily
Development of fruit without fertilizations is:
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Parthenogenesis
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Heterostyly
0%
Parthenocarpy
0%
Agamospermy
Explanation
Parthenocarpy
Who discovered fertilization?
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Nawaschin
0%
Strassburger
0%
Leeuwen Hock
0%
Robert Hook
Explanation
Strassburger
When more than one embryoper embryosac is found. It is called:
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Embryogeny
0%
Amphimisis
0%
Agamospormy
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Polyembryoni
Explanation
Polyembryoni
When pollen tube enter into the nucellus through micropyle is called:
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Porogamy
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Xenogamy
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Mesogamy
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Dikogamy
Explanation
Porogamy
Maturation of male and female sex organs at different times is known as:
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Herkogamy
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Dichogamy
0%
Polygamy
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Apogamy
Explanation
Herkogamy
Stalk of ovule is called :
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Funicle
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Caruncle
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Nucellus
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Pedicel
Explanation
Funicle
Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion. (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If both the assertion and reason are false Assertion: Pollen grains of some species can cause asthma. Reason: Pollen grains of some species are act as allergens.
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(a)
0%
(b)
0%
(c)
0%
(d)
Match the column
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p ->iii, q->ii, r ->iv, s -> i
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p ->ii, q->iii, r ->i, s -> iv
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p ->i, q->ii, r ->iv, s -> iii
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p ->ii, q->iii, r ->iv, s -> i
Starting from the innermost part, the correct sequence of parts in an ovule are
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egg, nucellus, embryo sac, integument
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embryo sac, nucellus, integument, egg
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egg, integument, embryo sac, nucellus.
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egg, embryo sac, nucellus, integument
During microsporogenesis, meiosis occurs in:
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Endothecium
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Microspore tetrads
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Pollen grains
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Microspore mother cells
Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion. (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If both the assertion and reason are false Assertion : Insects visit flowers to collect honey. Reason: Attractive colour of flowers prevents the insects from damaging other parts of the plant
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(a)
0%
(b)
0%
(c)
0%
(d)
Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion. (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If both the assertion and reason are false Assertion : Meiosis and syngamy are essential in sexual reproduction. Reason : Meiosis and syngamy are not essential in sexual reproduction.
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(a)
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(b)
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(c)
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(d)
In which one of the following, pollination is autogamous?
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Xenogamy
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Chasmogamy
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Geitonogamy
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Cleistogamy
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
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Cuticle
0%
Sporopollenin
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Cellulose
0%
Lignin
Amongst the pollinating agent which one is the most dominant?
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Butterflies and flies
0%
Beetles and wasps
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Bees
0%
Moths and birds
Seed is
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Fertilized ovule
0%
Fertilized endosperm
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Formed from pericarp
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Modification of integument
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