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CBSE Questions for Class 12 Medical Biology Sexual Reproduction In Flowering Plants Quiz 15 - MCQExams.com
CBSE
Class 12 Medical Biology
Sexual Reproduction In Flowering Plants
Quiz 15
Choose the correct answers from the alternatives given.
Cheiropteriphily is the name given to pollination by
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birds
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bats
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insects
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aquatic animals
Explanation
Bat-pollinated flowers tend to be large and showy, white or light
coloured
, open at night and have strong musty odours. They are often large and bell-shaped or a ball of stamens. Flowers are typically borne away from the trunk or other obstructions.
More than 500 species of plants, spanning 67 plant families, are pollinated by bats. This pollination syndrome is known as
chiropterophily
. In general, flowers that use this approach tend to be white or dull in colour, open at night, rich with nectar, and musty or rotten smell.
So, the correct option is, 'bats'.
The part of the embryo between the cotyledons and the embryonic root (radicle) is caved
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hypocotyl
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epicotyl
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plumule
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choleorhiza
Explanation
The part of the stem of an embryo plant beneath the stalks of the seed leaves or cotyledons and directly above the root is called hypocotyl.
In the developing embryo, the
hypocotyl
is the embryonic axis that bears the seedling leaves (cotyledons).
Upon germination, the
hypocotyl
pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem.
So, the correct option is, 'hypocotyl'.
Callase enzyme which dissolves callose of pollen tetrads to separate four pollens is provided by.
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Pollens
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Tapetum
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Middle layers
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Enodthecium
Explanation
Tapetum secretes Ubisch bodies which get covered with sporopollenin and so increase thickness of exine of pollen grain wall. Tapetum provides nourishment to developing microspores. It also secretes callase enzyme which dissolves callose susbtances by which four pollens of a pollen tetrad are united, hence separating microspores or pollens of a tetrad.
In a case of polyembryony, if an embryo develops from the synergid and another from the nucellus, then the synergid embryo is $$\underline{(i)}$$ and nucellar embryo is $$\underline{(ii)}$$.
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(i) triploid, (ii) haploid
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(i) diploid, (ii) haploid
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(i) haploid, (ii) diploid
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(i) diploid, (ii) triploid
Explanation
The occurrence of more than two embryos in the Seed is known as polyembryony.
Synergids cells are haploid (n). An embryo formed from a synergids cell will be haploid as well since it doesn’t undergo fertilization with a male gamete.
Nucellus is diploid (2n). An embryo formed from a nucellus will be diploid in nature too as it doesn’t undergo fertilization either.
So, the correct option is C.
In albuminous seeds, food is stored in ________ and in non-albumious seeds, it is stored in ___________.
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Endosperm, cotyledons
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Cotyledons, endosperm
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Nucellus, cotyledons
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Endosperm, radicle
Explanation
Albuminous seeds are the seeds which have food stored in the special nourishing tissue called as endosperm that remains persistent till maturity. Cotyledons only act as food sucking organs and not food storage organs e.g., Castor seed. N
on-albuminous seeds are the seeds which have the stored food and the cotyledons in a special structure called as a kernel. It does not remain until the embryo is mature. e.g. Pea seed.
So, the correct option is '
Endosperm, cotyledons'.
Match column I with column II and select the correct option from the given codes.
Column I
Column II
A. Anemophily
(i) Grasses, Date palm
B. Hydrophily
(ii) Rose, Jasmine
C. Entomophily
(iii) Butea, Bignonia
D. Omithophily
(iv) Vallisneria, Ceratophylium
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A-(i), B-(iv), C-(ii), D-(iii)
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A-(i), B-(iv), C-(iii), D-(ii)
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A-(ii), B-(iii), C-(i), D-(iv)
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A-(ii), B-(i), C-(iii), D-(iv)
Explanation
Anemophily
It is a form of pollination when pollen grains are distributed by wind. Also, called the anemophilous flower.
Anemophilous pollen grains are light and non-sticky. So, that it can be transferred by air currents. Wind-pollinated flowers are inconspicuous and they not showy and also devoid of nectar etc. as seen in grass
Hydrophily
It is a form of pollination when the pollination takes place through the agency of water.
It is of two types :
Hydrophily: Plants which are pollinated inside the water. e.g. Zoster, Ceratophyllum
Epihydrophilly: Plants which are pollinated outside the water or on the surface of the water. e.g. Vallisneria
Entomophily
It is a type of pollination, which takes py insect. Insect-pollinated flowers are made attractive in different ways and the pollens are sticky with a rough surface. So, that they may easily stick to insect limbs. e.g. Rose
Ornithophily
It is the form of pollination when the pollination takes place by birds. e.g. Begonia, Bottlebrush, Butea
So, the correct option is 'C'
Endospermic seeds are found in.
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Castor
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Barley
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Coconut
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All of these
Explanation
Endospermic seeds are those that have an endosperm in the mature seed. It is fleshy, oily, surrounds the embryo, and functions as the sole food storage organ. Inside the seed coat, a thin and papery cotyledon is present. Monocot plants have endospermic seeds.
So, the correct option is 'All of these'.
Statement $$1$$: Zygote is the vital link between two generations.
Statement $$2$$: Zygote is formed due to fusion of two haploid gametes.
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Both statements $$1$$ and $$2$$ are correct
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Statement $$1$$ is correct but statement $$2$$ is incorrect
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Statement $$1$$ is incorrect but statement $$2$$ is correct
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Both statements $$1$$ and $$2$$ are incorrect
Explanation
A zygote is a eukaryotic cell formed by a fertilization event between two gametes. The zygote's genome is a combination of the DNA in each gamete and contains all of the genetic information necessary to form a new individual. The zygote is the vital link that ensures continuity of species between organisms of one generation and the next. Every sexually reproducing organism, including human beings, begin life as a single cell - the zygote.
Thus, the correct option is 'Both statements 1 and 2 are correct.'
Which of the given statements are true?
(i) During the development of a dicot embryo, heart-shaped embryo is followed by globular embryo.
(ii) The part of embryonal axis above the level of cotyledons is epicotyl, while the part below the level of cotyledons is hypocotyl.
(iii) Monocot seeds possess a single cotyledon represented by scutellum.
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(i) and (ii)
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(ii) and (iii)
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(i) and (iii)
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(i), (ii) and (iii)
Explanation
During the development of dicot embryo, initially the dicot embryo is globular and undifferentiated. Early embryo with radial symmetry is called pro-embryo. It is transformed into embryo with the development of radicle, plumple and cotyledons. Two cotyledons differentiate from the sides with a faint plumle in the centre. At this time the embryo becomes heart-shaped.
Part of embryo axis between the plumple and cotyledonary node is epicotyle (the level of cotyledons) while the part between radicle and cotyledonary node is called hypocotyl (the level of cotyledons).
The single cotyledon of monocotyledonous seed(e.g., maize grain) is called scutellum. It occupies the major portion of the embryo regions of grain.
So, the correct answer is '(ii) and (iii)'.
The fleshy edible part of an apple is
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thalamus
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nucellus
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ovary
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endosperm
Explanation
If a fruit is formed from any other part of the flower than the ovary, then such a fruit is termed as false fruit. In apple the thallamus of the flower forms the edible part or the fruit.
So, the correct option is 'Option A'.
Transfer of pollen grain from the anther to the stigma of another flower of the same plant is called
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geitonogamy
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xenogamy
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cleistogamy
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chasmogamy
Explanation
Transfer of pollen grain from the anther to the stigma of another flower of the same plant is called geitonogamy. Although it is functionally cross-pollination genetically it is similar to autogamy.
So, the correct option is 'Option A'.
Intine layer of pollen grain is made up of
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Inner cellulose, outer pectin
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Outer cellulose, inner pectin
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Only with cellulose
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Only with pectin
Explanation
Pollen grains are a mass of microspores in a seeded plant which appears in the form of fine dust.
Each pollen grain is a minute body with varying shape and structure which are formed in the anthers of angiosperms.
It consists of two layers:-
1) Intine or inside layer is a thin and continuous layer made of
cellulose or hemicellulose and pectin.
2) Exine or outer layer
a highly decay-resistant chemical called sporopollenin.
The ploidy of aleurone layers is
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n
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2n
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3n
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4n
Explanation
In the flowering plants, endosperm cells are triploid in nature formed after triple fusion, the outer proteinous layer of the endosperm is the aleurone layer which is also a triploid (3n).
So, the correct answer is '3n'.
How many plants among Indigofera, Sesbania,
Salvia, Allium, Aloe
, Mustard, Groundnut, Radish, Gram, turnip have stamens with different lengths in their flower?
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Three
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Five
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Four
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Six
Explanation
Families of the given plants :
Indigofera: Fabaceae
Sesbania:
Fabaceae
Salvia
: Lamiaceae
Allium
:
Liliaceae
Aloe
: Liliaceae
Mustard: Brassicaceae
Groundnut:
Fabaceae
Radish:
Brassicaceae
Gram:
Fabaceae
Turnip:
Brassicaceae
The family having different length stamens in their flower is
Brassicaceae and Lamiaceae. we are provided with four plants belonging to the above two mentioned families. So,
Salvia
, mustard, radish, and gram will have unequal lengths of stamens.
So, the correct answer is 'Four'.
The character associated with the plant in which pollination is by
Tageticula.
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Marginal placentation
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Pentamerous flowers
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Trilocular ovary
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Perigynous flowers.
Explanation
Tageticula is a moth which deposits its egg in the ovary of the Yucca flower. Simultaneously it collects pollen and deposits the same in the hollow of stigma to effect pollination. The plants can reproduce vegetatively but the moths appear to be critical for sexual propagation. Yucca plant has a trilocular ovary means it contains 3 chambers or 3 locules.
So, the correct answer is C.
.
Ubisch bodies found in tapetal cell helps in the formation of
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Pollenkitt and pollinia
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Exine
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Intine and pollenkitt
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none of above
Which of the following statements about pollen and pollination is false?
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Evolution of the pollen grain rejected the need for swimming sperm in flowering plants
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At maturity, the pollen grain consists of two sperm nuclei and a tube nucleus
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The pollen tube enters the female gametophyte through the style
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The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo
Explanation
A fertilized egg develops into a sporophyte embryo. While some primitive gymnosperms have flagellated
sperm
cells, the
sperm
in most gymnosperms and all
angiosperms
lack flagella. In seed
plants
, the use of resistant, far-traveling, airborne pollen to bring gametes together is a terrestrial adaptation. So the statement of option A is correct.
But the endosperm has a diploid nucleus and the pollen grain has two male -haploid gametes, so the overall gene contribution of the endosperm and the pollen grain is equal.
So the correct answer should be option D,
The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo
.
Diploid zygote is formed by the fusion of male and female gamete. This process
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Fertilization
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Budding
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Pollination
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Spore
Explanation
Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud. Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud. Fertilization is the process in which a diploid zygote is formed by the fusion of male and female gamete.
So, the correct option is'Fertilization'.
Match items in column $$I$$ with those in column $$II$$.
Select the correct answer from the following.
(a) Floridean starch
(i) Metasequoia
(b) Rhizophore
(ii) Cycas
(c) Living fossil
(iii) Selaginella
(d) Coralloid root
(iv) Rhodophyceae
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a(ii),b(iii),c(i),d(iv)
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a(iv),b)(i),c(iii),d(ii)
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a(iv),b(iii),c(i),d(ii)
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a(i),b(ii),c(iii),d(iv)
Explanation
Rhizophores arise from angle meristems located at shoot branch points in many species of Selaginella. The living fossil in reference is the Dawn Redwood, Metasequoia glyptostroboides. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. Floridean starch is a type of storage glucan found in glaucophytes and in red algae (also known as rhodophytes), in which it is usually the primary sink for fixed carbon from photosynthesis. So the correct option is ' a(iv),b(iii),c(i),d(ii)'.
Which of the following statement is correct for pollinated ovary
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Nucellus is haploid
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Antipodal cells are haploid
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Egg cell is diploid
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Ovule is haploid
Explanation
Embryo sac develops from a single functional haploid megaspore and all the structures present in it are formed by the mitotic division of this haploid megaspore for example synergids, antipodal cells and egg cell. Therefore all these structures are haploid in nature. Ovule contains structure like integuments, nucellus, etc which are diploid. So ovule is a diploid structure. So the correct option is 'antipodal cells are haploid'
Which one of the following is a true fruit?
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Apple
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Pear
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Cashewnut
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Coconut
Explanation
Coconut is a true fruit. True fruit is when the fruit develops from a ripened ovary, it termed as true fruit. whereas the rest of the fruit apple, pear, and cashew nut are not a true fruit because they develop from any part of the flower except the ovary. So option D is correct.
Pollination possible in Carica is?
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Autogamy
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Xenogamy
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Geitonogamy
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Cleistogamy
Explanation
In Carica pollen is transferred from the anther to the stigma of the other plant that is called Xenogamy, as Carica plant is dioecious.
So, the correct answer is B.
Stamen consists of?
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Filament and anther
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Style and stigma
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Filament and pistil
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Anther and pistil
Explanation
Stamen consist of only filament and anther. Style, stigma and ovary are part of pistil.
So, the correct answer is '
Filament and anther'
Which of the following is not concerned with pollination?
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The falling of pollen grains on the stigma is pollination
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The pollen grains of one flower do not fall on the same flower
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The pollen grains of one flower fall on the another flower
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Pollination helps in fertilization
Identify the incorrect statement.
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In over $$60$$ percent of angiosperms, pollen grains all shed at $$2$$-celled stage
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In less than $$40$$ percent species of angiosperms pollination occurs at $$3$$-celled stage of pollen grains
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Intine of pollen grain is made up of cellulose and pectin
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Pollen grains of a few species cause severe allergies and bronchial
Epipetalous stamens are seen in
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Thespesia
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Datura
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Male flower of ricinus
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Ravenala
Explanation
When the stamens are associated or attached to other parts of the flower, the union is called the adhesion. When the adhesion occurs between the petals and stamens, the condition is called epipetalous. It is seen in
Datura.
The following diagram represents the epipetalous condition:
Hence, the correct answer is '
Datura'
Study the following structures in the box and find out how many of them are the products of differentiation (A), dedifferentiation (B) and redifferentiation(C).
Cortex, Phelloderm, secondary cortex, secondary phloem, primary medullary rays, interfascicular cambium, phellem, endodermis.
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A$$=3$$, B$$=1$$, C$$=4$$
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A$$=2$$, B$$=1$$, C$$=5$$
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A$$=3$$, B$$=3$$, C$$=2$$
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A$$=4$$, B$$=3$$, C$$=1$$
The diagram represents enlarged view of an egg apparatus showing entry of pollen tube. Identify labelled structures [A] and [B] of diagram.
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[A] Egg nucleus, [B] Male gametes
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[A] Egg nucleus, [B] Vegetatives nucleus
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[A] Synergid, [B] Vegetatives nucleus
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[A] Synergid,[B] Male gametes
Edible part of apple is?
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Bract
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Thalamus
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Cotyledon
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Endosperm
Explanation
Apple is a false fruit. False fruit is derived from the accessory floral parts other than ovary. In apple it develops from the thalamus.
So the correct answer is thalamus.
Persistent nucellus in the seed is known as:
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Chalaza
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Perisperm
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Hilum
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Tegmen
Explanation
Persistent nucellus in some seeds is called Perisperm.
Perisperm is a layer of nutritive tissue in the seed of certain flowering plants. It is derived from the nucellus and surrounds the embryo.
So, the correct answer is '
Perisperm'
The spiny seeds with hooks of _______ and ________
get attached to the bodies of animals and are carried to distant places.
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Xanthium and Urena
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Coconut and Mango
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Xanthium and Mango
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Coconut and Urena
Explanation
Some seeds are dispersed by animals, especially spiny seeds with hooks which get attached to the bodies of animals and are carried to distant places.
Examples are Xanthium and Urena.
Hence, Option A is correct.
Choose the correct option.
i)
Hydrilla
and water lily are pollinated by water.
ii) Water lily and water hyacinth are pollinated by insects or wind.
iii) Water hyacinth and
Vallisneria
are pollinated by water.
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i
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ii
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iii
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i, ii, iii
Explanation
$$Vallisneria$$ and $$Hydrilla$$ are pollinated by water whereas water lily and water hyacinth are pollinated by either insects or wind. So, the correct answer is option B.
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