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Sexual Reproduction In Flowering Plants

554 Questions Start Allen Test
All Exams Allen Errorless
Q476 Allen ANALYTICAL QUESTIONS MCQ
Go through the following
statements:-
(I) Flowers are small. They are often packed in inflorescence
(II) Flowers are colourless, nectar less and odourless
(III) Well exposed stamens
(IV) Pollen grains are produced in large numbers which are light and non-sticky
(V) Flower often have a single ovule in each ovary.
(VI) Stigma is large and often feathery. The above contrivances favour
A.
Cross pollination
B.
Anemophily (pollination by wind)
C.
Ornithophily (pollination by birds)
D.
Entomophily (pollination by insects)
Q477 Allen ANALYTICAL QUESTIONS MCQ
Which of the following is the tallest flower?
A.
Vallisneria
B.
Rafflesia
C.
Amorphophallus
D.
Zostera
Q478 Allen ANALYTICAL QUESTIONS MCQ
Endosperm is formed during the double fertilization by :-
A.
Two polar nuclei and one male gamete
B.
One polar nuclei and one male gamete
C.
Ovum and male gamete
D.
Two polar nuclei and two male gametes
Q479 Allen ANALYTICAL QUESTIONS MCQ
In Angiosperms pollen tube liberate their male gametes into the :-
A.
Central cell
B.
Antipodal cells
C.
Egg cell
D.
Synergid
Q480 Allen ANALYTICAL QUESTIONS MCQ
In which part of embryo maximum growth takes place in hypogeal germination: -
A.
Plumule
B.
Radicle
C.
Epicotyl
D.
Hypocotyl
Q481 Allen ANALYTICAL QUESTIONS MCQ
In seeds, characterised by hypogeal germination, cotyledons generally do not becomes green because :-
A.
They lack mitochondria
B.
They developed very early
C.
They contain inhibitor
D.
They remain below the soil
Q482 Allen ANALYTICAL QUESTIONS MCQ
Which of the following will lose its economic value if fruits are produced through parthenocarpy?
A.
Citrus
B.
Banana
C.
Grapes
D.
Pomegranate
Q483 Allen ANALYTICAL QUESTIONS MCQ
In which method megaspore mother cell directly gives rise to an embryo sac without meiosis?
A.
Diplospory
B.
Adventive embryony
C.
Apospory
D.
Apogamy
Q484 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements:- Statement-I: When pollen grains are released from pollen sac and they land on stigma of pistil, it is called pollination. Statement-II:Pollen tube enters into embryo sac where two male gametes fuse with female gamete. In the light of the above statements, choose the most appropriate answer from the options given below:
A.
Both Statement-I and Statement-II are correct.
B.
Statement-I is correct but statement-II is incorrect.
C.
Statement-I is incorrect and Statement-II is correct.
D.
Both Statement-I and Statement-II are incorrect.
Q485 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements:- Statement-I: A typical anther is tetrasporangiate. Statement-II: A typical anther is dithecous. In the light of the above statements, choose the most appropriate answer from the options given below:
A.
Both Statement-I and Statement-II are correct.
B.
Statement-I is correct but statement-II is incorrect.
C.
Statement-I is incorrect and Statement-II is correct.
D.
Both Statement-I and Statement-II are incorrect.
Q486 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements:- Statement-I:Exine of pollen grain is made up of sporopollenin. Statement-II: Intine helps in germination of pollen grain. In the light of the above statements, choose the most appropriate answer from the options given below:
A.
Both Statement-I and Statement-II are correct.
B.
Statement-I is correct but statement-II is incorrect.
C.
Statement-I is incorrect and Statement-II is correct.
D.
Both Statement-I and Statement-II are incorrect.
Q487 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements:- Statement-I: To some extent viability of pollen grains depends upon prevailing temperature and humidity. Statement-II: Viability is lost in few minutes only of the pollen grains of Solanaceae family. In the light of the above statements, choose the most appropriate answer from the options given below:
A.
Both Statement-I and Statement-II are correct.
B.
Statement-I is correct but statement-II is incorrect.
C.
Statement-I is incorrect and Statement-II is correct.
D.
Both Statement-I and Statement-II are incorrect.
Q488 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements (for angiosperm plants) :- Statement-I : A mature male gametophyte possess two male gametes. Statement-II: A mature female gametophyte is 7-celled and 8 nucleated in typical angiosperms. In the light of the above statements, choose the most appropriate answer from the options given below:
A.
Both Statement-I and Il are correct.
B.
Statement-I is correct but statement-Il is incorrect.
C.
Statement-I is incorrect and Statement-II is correct.
D.
Both Statement-I and Statement-II are incorrect.
Q489 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as
Reason(R) :-
Assertion (A) : Geitonogamy is genetically same as autogamy.
Reason (R) : In Geitonogamy transfer of pollen grains occur from one plant to another plant.
In the light of the above statements,
choose the most appropriate answer from the options given below :
A.
If (A) & (R) both are correct but (R) is not the correct explanation of (A).
B.
(A) is correct but (R) is incorrect.
C.
(A) is not correct but (R) is correct.
D.
If (A) & (R) both are correct and (R) is the correct explanation of (A).
Q490 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as
Reason(R) :-
Assertion (A) : Homogamy in receptivity by stigma and pollen release is essential for autogamy.
Reason (R) : Heterogamy increases the opportunities for successful allogamy.
In the light of the above statements,
choose the most appropriate answer from the options given below :
A.
If (A) & (R) both are correct but (R) is not the correct explanation of (A).
B.
(A) is correct but (R) is incorrect.
C.
(A) is not correct but (R) is correct.
D.
If (A) & (R) both are correct and (R) is the correct explanation of (A).
Q491 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason(R) .
Assertion (A) : Loss of pollen grain occur maximum in anemophily.
Reason (R) : In this type of pollination, pollen grains move completely in nondirectional form.
In the light of the above statements,
choose the most appropriate answer from the options given below :
A.
If (A) & (R) both are correct but (R) is not the correct explanation of (A).
B.
(A) is correct but (R) is incorrect.
C.
(A) is not correct but (R) is correct.
D.
If (A) & (R) both are correct and (R) is the correct explanation of (A).
Q492 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as
Reason (R) :-
Assertion (A): In angiosperm plants, nuclear endosperm is most common.
Reason (R): When formation of endosperm occur due to free nuclear division, is called cellular endosperm.
In the light of the above statements,
choose the most appropriate answer from the options given below :
A.
If (A) & (R) both are correct but (R) is not the correct explanation of (A).
B.
(A) is correct but (R) is incorrect.
C.
(A) is not correct but (R) is correct.
D.
If (A) & (R) both are correct and (R) is the correct explanation of (A).
Q493 Allen ANALYTICAL QUESTIONS MCQ
Identify the correct set of statements :-
(a) Wolfia is a microscopic plant belongs to angiosperms.
(b) Double fertilization is an unique event seen in gymnosperms.
(c) Male sex organs in angiosperm are called stamens, present in flowers.
(d) Total three male gametes participate in double fertilization.
A.
all a, b, c, d are correct
B.
b, c and d are correct
C.
a, c and d are correct
D.
only a and c are correct
Q494 Allen ANALYTICAL QUESTIONS MCQ
Identify the correct set of statements :-
(a) In gymnosperms seeds are not enclosed by fruits.
(b) Angiosperm plantā€™s possess diplontic life cycle.
(c) Flower is the structure in which sexual reproductive organs of angiosperm are present.
(d) Endosperm formation in angiosperm is not a per-fertilization event.
A.
only b, c & d are correct
B.
b and c are correct
C.
a, b, c and d all are correct
D.
only a and c are correct
Q495 Errorless Microsporogenesis MCQ
Which one of the following statements is not true
A.
Tapetum helps in the dehiscence of anther
B.
Exine of pollen grains is made up of sporopollenin
C.
Pollen grains of many species cause severe allergies
D.
Stored pollen in liquid nitrogen can be used in the crop breeding programmes
Q496 Errorless Microsporogenesis MCQ
The given figure represents some stages in microgametogenesis. Identify A, B and C respectively
A.
Symmetric spindle Vegetative cellGenerative cell
B.
Symmetric spindle Generative cell Vegetative cell
C.
Asymmetric spindle Vegetative cell Generative cell
D.
Asymmetric spindle Generative cellVegetative cell
Q497 Errorless Microsporogenesis MCQ
The given figure is an enlarged view of one microsporangium of a matured anther. identify A, B and C Epidermis
A.
A - Endothecium, B - Tapetum, C - Middle layer
B.
A - Middle layer, B - Endothecium, C - Tapetum
C.
A - Tapetum, B - Middle layer, C - Endothecium
D.
A - Endothecium, B - Middle layer, C - Tapetum
Q498 Errorless Microsporogenesis MCQ
In given figure A and B are respectively [NCERT]
A.
Epicarp and endocarp
B.
Epidermis and endodermis
C.
Intine, exine
D.
Exine, intine
Q499 Errorless Microsporogenesis MCQ
Identify A, B, C and D in given figure
A.
Anther Filament Pollen sac Pollen grains
B.
Anther Pedicel Megasporangium Pollen grains
C.
Anther Petiole Megasporangium Pollen grains
D.
Anther Petiole Pollen sac Magaspore
Q500 Errorless Megasporogenesis MCQ
The hilum is a scar on the [AIPMT (Cancelled) 201!
A.
Fruit, where it was attached to pedicel
B.
Fruit, where style was present
C.
Seed, where micropyle was present
D.
Seed, where funicle was attached