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NEET • BIOLOGY • SEXUAL REPRODUCTION IN FLOWERING PLANTS
Sexual reproduction in flowering plants practice · Medium
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1
Medium
1 of 82
Application
+4 | -1
How many meiotic divisions are required to produce 100 seeds in a typical flowering plant?
View answer and explanation
Correct option: D
125
Option D (125) is correct because each seed requires one meiosis for the egg and one for the pollen, and double fertilization requires two sperm cells.
2
Medium
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Remembering
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Ornithophily refers to the pollination by which of the following?
View answer and explanation
Correct option: B
Birds
Option B (Birds) is correct because ornithophily specifically refers to pollination by birds.
3
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Understanding
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Fruit and seed develops
View answer and explanation
Correct option: A
Simultaneously
Option A (Simultaneously) is correct because fruit and seed development are closely coordinated and occur concurrently after fertilization.
4
Medium
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Understanding
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Identify the correct statement.
View answer and explanation
Correct option: D
Grafting is difficult in monocot plants as they have scattered vascular bundles
Option D (Grafting is difficult in monocot plants as they have scattered vascular bundles) is correct because the scattered vascular bundles in monocots make it difficult to establish vascular connections during grafting.
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Understanding
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Identify the characters with reference to the plant in which eight nucleated embryo sac was first studied by strasburger.
I – Micropyle, chalaza and funiculus are arranged in the same vertical line
In the ovule.
II – presence of both unisexual and bisexual flowers in the same plant.
III – Filiform apparatus helps in conduction of food materials from
Endosperm to egg apparatus.
IV – Long funiculus coils like a watch spring around the ovule.
I – Micropyle, chalaza and funiculus are arranged in the same vertical line
In the ovule.
II – presence of both unisexual and bisexual flowers in the same plant.
III – Filiform apparatus helps in conduction of food materials from
Endosperm to egg apparatus.
IV – Long funiculus coils like a watch spring around the ovule.
View answer and explanation
Correct option: C
I and II
Option A (I and IV) is correct because Strasburger's plant study involved characteristics related to ovule structure and arrangement, as described in statements I and IV.
6
Medium
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Application
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What would be the number of chromosomes of the aleurone cell of a plant with 42 chromosomes in its root tip cells?
View answer and explanation
Correct option: A
63
Option A (63) is correct because the aleurone cell is triploid (3n), and if root tip cells (2n) have 42 chromosomes, then the aleurone cell has (3/2) * 42 = 63 chromosomes.
7
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Analyzing
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How many of the following statement is/are incorrect?
A) Nuclear type of endosperm is the rarest type of endosperm, in which the nucleus remains intact.
B) Cellular type of endosperm involves both karyokinesis and cytokinesis, simultaneously.
C) Cellular type of endosperm is found in coconut.
A) Nuclear type of endosperm is the rarest type of endosperm, in which the nucleus remains intact.
B) Cellular type of endosperm involves both karyokinesis and cytokinesis, simultaneously.
C) Cellular type of endosperm is found in coconut.
View answer and explanation
Correct option: B
Two
Option B (Two) is correct because two statements (A and C) are incorrect regarding the types of endosperm.
8
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Remembering
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True fruit is directly derived from
View answer and explanation
Correct option: D
None of the above
The correct answer is None of the above because a true fruit is derived from the ovary.
9
Medium
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Understanding
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All of the given are true w.r.t. innermost wall layer of anther, except
View answer and explanation
Correct option: B
Helps in dehiscence of anther
Option B is correct because the tapetum's primary functions are nourishing the developing pollen grains and contributing to pollen wall formation, not anther dehiscence, which is primarily the role of the endothecium.
10
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Remembering
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Perisprem is found in
View answer and explanation
Correct option: D
Both (a) and (c)
Option D (Both (a) and (c)) is correct because perisperm, the remnant of the nucellus, is found in black pepper and beet.
11
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Understanding
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Cleistogamy ensures seed set formation. This is an advantage but still there are disadvantages too. One of the disadvantage is
View answer and explanation
Correct option: C
Genetic variations are limited in progeny
The correct answer is C (Genetic variations are limited in progeny) because cleistogamy, which is self-pollination within a closed flower, restricts genetic recombination and diversity.
12
Medium
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Analyzing
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Assertion: Coconut water represents the cellular endosperm and the surrounding white kernel represents the free-nuclear endosperm in Cocos nucifera.
Reason: PEN undergoes a number of free nuclear divisions all of which are subsequently followed by wall formation.
Reason: PEN undergoes a number of free nuclear divisions all of which are subsequently followed by wall formation.
View answer and explanation
Correct option: D
If both Assertion and Reason are false
Option D (If both Assertion and Reason are false) is correct because coconut water represents the free-nuclear endosperm, and the white kernel represents the cellular endosperm. The reason is also incorrect because wall formation does not always follow nuclear divisions.
13
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Analyzing
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(A): An insect visit to a flower always ensures cross pollination
(R): Insects visits the flower for nectar
(R): Insects visits the flower for nectar
View answer and explanation
Correct option: D
(A) is false but (R) is true
Option D ((A) is false but (R) is true) is correct because an insect visit does not always ensure cross-pollination (it can be self-pollination), but insects do visit flowers for nectar.
14
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Application
+4 | -1
Total number of meiotic division required for forming 100 zygotes/100 grains of wheat is
View answer and explanation
Correct option: C
125
Option C (125) is correct because 100 zygotes require 100 eggs (100 meiotic divisions in megasporogenesis) and 100 pollen grains, which require 25 meiotic divisions in microsporogenesis (since each meiotic division produces 4 pollen grains). Therefore, 100 + 25 = 125.
15
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Application
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If the endosperm of an angiosperm has 24 chromosomes, what would be the number of chromosomes in the megaspore mother cell of the same palnt?
View answer and explanation
Correct option: B
16
Option B (16) is correct because the megaspore mother cell is diploid (2n), and the endosperm in angiosperms is triploid (3n). Therefore, if 3n=24, then 2n=16.
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16
Medium
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Understanding
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Non-albuminous seed
View answer and explanation
Correct option: D
All of these
The correct answer is D (All of these) because non-albuminous seeds lack a persistent endosperm, are also called exalbuminous, and typically have thick cotyledons that store the reserve food.
17
Medium
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Remembering
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What is pollen grain?
View answer and explanation
Correct option: C
Male gametophyte
Option C (Male gametophyte) is correct because a pollen grain represents the immature male gametophyte in flowering plants.
18
Medium
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Analyzing
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On the basis of ploidy in flowering plants, select the odd one out.
View answer and explanation
Correct option: C
Embryo sac
Option C (Embryo sac) is correct because Chalaza, Nucellus, and Integument are all diploid (2n) tissues of the ovule, whereas the embryo sac is haploid (n) after meiosis.
19
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Understanding
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Double fertilization involves
View answer and explanation
Correct option: D
Fertilization of the egg and the central cell by two sperms brought by the same pollen tube
The correct answer is D (Fertilization of the egg and the central cell by two sperms brought by the same pollen tube) because double fertilization involves one sperm fertilizing the egg and another sperm fertilizing the central cell, both delivered by the same pollen tube.
20
Medium
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Analyzing
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Identify mismatch
View answer and explanation
Correct option: D
self-sterility – gloris
Option D (self-sterility – gloris) is correct because self-sterility is commonly observed in plants like Petunia, not typically associated with Gloriosa.
21
Medium
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Understanding
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Arrange the following in a correct sequence
I. Formation of zygote
II. Transfer of gametes
III. Formation of gametes
IV. Formation of embryo
I. Formation of zygote
II. Transfer of gametes
III. Formation of gametes
IV. Formation of embryo
View answer and explanation
Correct option: B
III,II,I,IV
Option B (III,II,I,IV) is correct because gamete formation precedes transfer, which leads to zygote formation, and finally, embryo development.
22
Medium
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Remembering
+4 | -1
In albuminous seeds, food is stored in _____ and in non- albuminous seeds, it is stored in ______
View answer and explanation
Correct option: A
Endosperm, cotyledons
Option A (Endosperm, cotyledons) is correct because albuminous seeds store food in the endosperm, while non-albuminous seeds store food in the cotyledons.
23
Medium
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Application
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In an angiosperm, male plant is diploid and female plant is tetraploid then endosperm will be
View answer and explanation
Correct option: D
Pentaploid
Option D (Pentaploid) is correct because the endosperm is formed by the fusion of two polar nuclei (4n + 4n) and one sperm (2n), resulting in 6n, but since the question states tetraploid female plant, it should be 2n + 2n + n = 5n.
24
Medium
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Remembering
+4 | -1
Dispersal of seeds by wind is called?
View answer and explanation
Correct option: B
Anemophily
Option B (Anemophily) is correct because anemophily refers to the dispersal of seeds by wind.
25
Medium
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Application
+4 | -1
Root has 42 chromosome then find out the chromosomal number of synergid
View answer and explanation
Correct option: C
21
Option C (21) is correct because the synergid is a haploid cell (n), and if the root has 42 chromosomes (2n), then n = 21.
26
Medium
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Application
+4 | -1
If an endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in each cell of the root will be
View answer and explanation
Correct option: C
16
Option C (16) is correct because the root cell is diploid (2n) and the endosperm cell is triploid (3n). Therefore, if 3n = 24, then n = 8 and 2n = 16.
27
Medium
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Analyzing
+4 | -1
Find out the odd one.
View answer and explanation
Correct option: D
Pollen grain
Option D (Pollen grain) is correct because Micropyle, Embryo sac, and Nucellus are all parts of the ovule, while pollen grain is part of the stamen (male reproductive part).
28
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Remembering
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Which of these cells is the largest cell of the ovule?
View answer and explanation
Correct option: B
Central cell
Option B (Central cell) is correct because the central cell is the largest cell in the ovule.
29
Medium
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Remembering
+4 | -1
The function innermost layer of pollen sac, tapetum is
View answer and explanation
Correct option: B
Nutritive
Option B (Nutritive) is correct because the tapetum's primary function is to provide nourishment to the developing pollen grains.
30
Medium
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Understanding
+4 | -1
‘Mircrospores arranged in a cluster of four cells called megaspore tetrad’. The above statement is
View answer and explanation
Correct option: B
FALSE
Option B (FALSE) is correct because microspores are arranged in a cluster of four cells called a microspore tetrad, not a megaspore tetrad.
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