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NEET • BIOLOGY • SEXUAL REPRODUCTION IN FLOWERING PLANTS
Sexual reproduction in flowering plants practice · Hard
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1
Hard
1 of 43
Remembering
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The persistent nucellus is a
View answer and explanation
Correct option: A
thin remaining layer of nucellus
Option A (thin remaining layer of nucellus) is correct because the perisperm is the remnant of the nucellus in some seeds.
2
Hard
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Remembering
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Which of the following structure guides the entry of pollen tube into the embryo sac?
View answer and explanation
Correct option: C
Filiform apparatus of synergid cells
Correct Answer + Core Reason: Filiform apparatus of synergid cells. The filiform apparatus guides the pollen tube into the embryo sac by secreting chemoattractants.
3
Hard
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Remembering
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The phenomenon wherein, the ovary develops into a fruit without fertilisation is called
View answer and explanation
Correct option: A
Parthenocarpy
The correct answer is A (Parthenocarpy) because parthenocarpy is specifically the development of fruit from the ovary without fertilization.
4
Hard
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Understanding
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Find out the correct statement w.r.t. ex-albuminous seeds
View answer and explanation
Correct option: A
Its endosperm is completely consumed during embryonic development
Option A (Its endosperm is completely consumed during embryonic development) is correct because ex-albuminous seeds lack endosperm at maturity.
5
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Understanding
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[A]: The pollen sterility has been attributed to the malfunctioning of tapetum.
[R]: Premature degeneration of the tapetum deprives the developing spores of its nutrition.
[R]: Premature degeneration of the tapetum deprives the developing spores of its nutrition.
View answer and explanation
Correct option: A
Both A and R are true and R is the correct explanation of A
Option A (Both A and R are true and R is the correct explanation of A) is correct because tapetum malfunctioning can lead to pollen sterility due to lack of nutrition.
6
Hard
6 of 43
Understanding
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Hexaploid wheat 42 chromosomes the number of chromosomes in a synergid will be
View answer and explanation
Correct option: A
7
Option D (21) is correct because the synergid is a haploid cell (n) and in hexaploid wheat (2n = 42), n = 21.
7
Hard
7 of 43
Understanding
+4 | -1
In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be
View answer and explanation
Correct option: B
Diploid
Option B (Diploid) is correct because if meiosis does not occur, the megaspores will have the same ploidy as the megaspore mother cell, which is diploid.
8
Hard
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Understanding
+4 | -1
Pick out the wrong statement.
View answer and explanation
Correct option: A
Double fertilization is unique to gymnosperms and monocotyledons
Option A is the wrong statement because double fertilization is unique to angiosperms, not gymnosperms and monocotyledons.
9
Hard
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Understanding
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Diploid egg parthenogenesis which does not involve is
View answer and explanation
Correct option: B
Apospory
The correct answer is Apospory because it involves the development of a diploid embryo sac from a nucellus cell without meiosis.
10
Hard
10 of 43
Understanding
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During artificial hybridisation, there is no need of emasculation when
View answer and explanation
Correct option: A
Female parent produces unisexual flower
Option A is correct because if the female parent produces unisexual flowers (female flowers), emasculation (removal of anthers) is unnecessary as the flower already lacks anthers.
11
Hard
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Application
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If there are 40 PMC in anther, what will be the number of pollen grains?
View answer and explanation
Correct option: A
160
Option A (160) is correct because each pollen mother cell (PMC) produces 4 pollen grains. Therefore, 40 PMCs will produce 160 pollen grains.
12
Hard
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Understanding
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Mark the statement not true for an anatropous ovule.
View answer and explanation
Correct option: D
Ploidy of funicle, nucellus and all cells of embryo sac are same
Option D (Ploidy of funicle, nucellus and all cells of embryo sac are same) is the statement not true for an anatropous ovule because the ploidy levels of the funicle, nucellus, and cells of the embryo sac are not all the same.
13
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Understanding
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In maize, a myocyte has 20 chromosomes. What will be the number of chromosomes in its vegetative
cell of pollen grain and nucellus cell of ovule respectively?
cell of pollen grain and nucellus cell of ovule respectively?
View answer and explanation
Correct option: C
10, 20
Option C (10, 20) is correct because the vegetative cell of pollen grain is haploid (n) and the nucellus cell is diploid (2n).
14
Hard
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Remembering
+4 | -1
The hollow foliar structure in a wheat embryo that encloses the shoot apex and a few primordia is called?
View answer and explanation
Correct option: D
Coleoptile
Option D (Coleoptile) is correct because the coleoptile is a protective sheath covering the young shoot in grasses like wheat.
15
Hard
15 of 43
Remembering
+4 | -1
Seed coat is not thin, membranous in
View answer and explanation
Correct option: D
coconut
Option D (coconut) is correct because coconut has a thick, fibrous seed coat (mesocarp), unlike the thin seed coats of groundnut, gram, and maize.
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16
Hard
16 of 43
Understanding
+4 | -1
Aleurone layer in the monocot seed helps in
View answer and explanation
Correct option: D
All the above
Option D (All the above) is correct because the aleurone layer is involved in embryo protection, utilization of stored foods, and storage of food in the endosperm.
17
Hard
17 of 43
Analyzing
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Which of the following statement(s) is/are false?
(i) Pollen grains represent immature male gametophyte.etophyte.
(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) Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases.
(vi) Pollen grains are poor in nutrients.
(i) Pollen grains represent immature male gametophyte.etophyte.
(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) Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases.
(vi) Pollen grains are poor in nutrients.
View answer and explanation
Correct option: B
(iii) and (vi)
Option B ((iii) and (vi)) is correct because the generative cell is spermatogenous (forms sperm), the vegetative cell is siphonogenous (forms pollen tube), and pollen grains are rich in nutrients.
18
Hard
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Understanding
+4 | -1
The number of chromosomes in radicle is 16. What will be number of chromosomes in pollen tube nucleus, antipodals, secondary nucleus and endosperm respectively?
View answer and explanation
Correct option: A
8, 8, 16, 24
Option A (8, 8, 16, 24) is correct because pollen tube nucleus and antipodals are haploid (n), secondary nucleus is diploid (2n), and endosperm is triploid (3n).
19
Hard
19 of 43
Application
+4 | -1
In the formation of 50 zygotes in a tobacco plant the minimum number of meiosis involved will be.
View answer and explanation
Correct option: B
63
Option B (63) is correct because 50 meiotic divisions are required for 50 eggs, and 13 meiotic divisions are required for 50 pollen grains (since one meiosis produces 4 pollen grains).
20
Hard
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Remembering
+4 | -1
The cytoplasm of pollengrain is surrounded by?
View answer and explanation
Correct option: B
Plasmamembrane
Option B (Plasmamembrane) is correct because the cytoplasm of any cell, including a pollen grain, is surrounded by the plasma membrane.
21
Hard
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Understanding
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(A): Female gametophyte in angiosperms is eight nucleated
(R): Double fertilization occurs in angiosperms
(R): Double fertilization occurs in angiosperms
View answer and explanation
Correct option: B
Both A and R are true and R is not the correct explanation of A
Option B (Both A and R are true and R is not the correct explanation of A) is correct because both the assertion (female gametophyte is eight nucleated) and the reason (double fertilization occurs) are true, but double fertilization doesn't explain why the female gametophyte is eight nucleated.
22
Hard
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Remembering
+4 | -1
Which of the following flowers is unisexual?
View answer and explanation
Correct option: A
Cucumber
Option A (Cucumber) is correct because cucumber flowers are unisexual, meaning they have either male or female reproductive parts, but not both.
23
Hard
23 of 43
Remembering
+4 | -1
Apomictic embryos in Citrus arise from:
View answer and explanation
Correct option: D
Maternal saprophytic tissue in ovule
Option D (Maternal saprophytic tissue in ovule) is correct because apomictic embryos in Citrus often arise from nucellar tissue, which is maternal sporophytic tissue.
24
Hard
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Remembering
+4 | -1
Megasporangium along with its protective integuments is called?
View answer and explanation
Correct option: B
Ovule
Option B (Ovule) is correct because the megasporangium with its protective integuments is the ovule.
25
Hard
25 of 43
Understanding
+4 | -1
The plant part which consists of two generations one within the other is?
View answer and explanation
Correct option: C
Unfertilized ovule
Option C (Unfertilized ovule) is correct because the ovule contains the female gametophyte (embryo sac), which is one generation, and is itself part of the sporophyte (parent plant), which is the other generation.
26
Hard
26 of 43
Remembering
+4 | -1
Polyembryony is reported in
I. Citrus
II. Mango
III.
Correct name are
I. Citrus
II. Mango
III.
Correct name are
View answer and explanation
Correct option: D
I and II
Option D (I and II) is correct because polyembryony is commonly reported in Citrus and Mango.
27
Hard
27 of 43
Remembering
+4 | -1
Both chasmogamous and Cleistogamous flowers are present in
View answer and explanation
Correct option: B
Commelina – I
Option B (Commelina – I) is correct because certain species of Commelina produce both chasmogamous (open) and cleistogamous (closed) flowers.
28
Hard
28 of 43
Understanding
+4 | -1
Production of sperms from microspore, wound healing and restoration of karyocytoplasmic ratio is due to
View answer and explanation
Correct option: A
Mitosis
Option A (Mitosis) is correct because mitosis is responsible for cell division that produces sperms from microspores, wound healing, and restoration of karyocytoplasmic ratio.
29
Hard
29 of 43
Remembering
+4 | -1
‘In coconut the cellular endosperm surrounds the nuclear endosperm’. The above statement is
View answer and explanation
Correct option: A
TRUE
Option A (TRUE) is correct because in coconut, the cellular endosperm does indeed surround the nuclear endosperm.
30
Hard
30 of 43
Understanding
+4 | -1
Consider the following statements with respect to hydrophily and select the right choice.
(i) It is quite rare in flowering plants.
(ii) Pollen grains are protected by mucilaginous covering.
(iii) In some plants, pollens are released inside the water.
(iv) Flowers are very colourful but without nectar.
(i) It is quite rare in flowering plants.
(ii) Pollen grains are protected by mucilaginous covering.
(iii) In some plants, pollens are released inside the water.
(iv) Flowers are very colourful but without nectar.
View answer and explanation
Correct option: A
I, II & III are correct
Option A (I, II & III are correct) is correct because hydrophily is rare, pollen grains are protected by mucilage, and some plants release pollen inside the water.
Revision notes and key takeaways
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Key Takeaways
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