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Sexual Reproduction In Flowering Plants

554 Questions Start Allen Test
All Exams Allen Errorless
Q401 Allen PYQ MCQ
In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is :
(A) 3 successive free nuclear divisions functional megaspore.
(B) Degeneration of 3 megaspores.
(C) Meiotic division in megaspore mother cell.
(D) Migration of 3 nuclei towards each pole.
(E) Formation of wall resulting in seven celled embryo sac.
A.
A, B, C, D, E
B.
C, E, A, D, B
C.
B, C, A, D, E
D.
C, B, A, D, E
Q402 Allen PYQ MCQ
Identify the part of the seed from the given figure which is destined to form root when the seed germinates.
A.
A
B.
B
C.
C
D.
D
Q403 Allen PYQ MCQ
Identify the set of correct statements :
(A) The flowers of Vallisneria are colourful and produce nectar.
(B) The flowers of waterlily are not pollinated by water.
(C) In most of water-pollinated species, the pollen grains are protected from wetting.
(D) Pollen grains of some hydrophytes are long and ribbon like.
(E) In some hydrophytes, the pollen grains are carried passively inside water.
A.
C, D and E only
B.
A, B, C and D only
C.
A, C, D and E only
D.
B, C, D and E only
Q404 Allen PYQ MCQ
Identify the correct description about the given figure :
A.
Wind pollinated plant inflorescence showing flowers with well exposed stamens.
B.
Water pollinated flowers showing stamens with mucilaginous covering.
C.
Cleistogamous flowers showing autogamy
D.
Compact inflorescence showing complete autogamy.
Q405 Allen PYQ MCQ
Which part of the ovule stores reserve food materials ?
A.
Nucellus
B.
Integument
C.
Placenta
D.
Funicle
Q406 Allen PYQ MCQ
The part marked as 'x' in the given figure is:
A.
Endosperm
B.
Thalamus
C.
Endocarp
D.
Mesocarp
Q407 Allen NCERT BASED QUESTIONS MCQ
Each cell of sporogenous tissue is potential pollen or microspore mother cell; Division taking place in sporogenous cell is :-
A.
Meiosis
B.
Mitosis
C.
Endomitosis
D.
Amitosis
Q408 Allen NCERT BASED QUESTIONS MCQ
In over 60% of angiosperms pollen grains are shed at :-
A.
One celled stage
B.
Three nuclei stage
C.
Two celled stage
D.
Three celled stage
Q409 Allen NCERT BASED QUESTIONS MCQ
Two non motile male gametes in angiosperms are produced by :-
A.
Generative cell
B.
Microspore mother cell
C.
Vegetative cell
D.
Tube cell
Q410 Allen NCERT BASED QUESTIONS MCQ
Pollen grains of many species cause severe allergies & bronchial afflictions in some people often leading to chronic respiratory disorder such as :-
A.
Asthma
B.
Bronchitis
C.
Both (1) & (2)
D.
Emphysema
Q411 Allen NCERT BASED QUESTIONS MCQ
Which of the following haploid structure is present in male plant of papaya?
A.
Antipodal cell
B.
Microspore mother cell
C.
Generative cell
D.
Both (1) & (3)
Q412 Allen NCERT BASED QUESTIONS MCQ
Pollen grain represents:-
A.
Female gametophyte
B.
Megasporangium
C.
Male gametophyte
D.
Sporophyte
Q413 Allen NCERT BASED QUESTIONS MCQ
In a pollen grain the small cell is spindle shaped with dense cytoplasm is :-
A.
Vegetative cell
B.
Generative cell
C.
Tube cell
D.
All
Q414 Allen NCERT BASED QUESTIONS MCQ
The innermost wall layer of anther is tapetum; the main function of tapetum is :-
A.
Divison
B.
Support
C.
Nutrition
D.
Protection
Q415 Allen NCERT BASED QUESTIONS MCQ
A typical angiosperm embryo sac at maturity is:
A.
7 celled - 8 nucleated
B.
9 celled - 7 nucleated
C.
3 celled - 3 nucleated
D.
2 celled - 2 nucleated
Q416 Allen NCERT BASED QUESTIONS MCQ
Arising from placenta is megasporangium which is commonly known as :-
A.
Ovule
B.
Ovary
C.
Ovarian cavity
D.
Stamen
Q417 Allen Sexual Reproduction in Flowering Plants MCQ
Transfer of pollen grains from the anther to the stigma of another flower of same plant is called :-
A.
Xenogamy
B.
Autogamy
C.
Geitonogamy
D.
Allogamy
Q418 Allen Sexual Reproduction in Flowering Plants MCQ
The part of pistil which acts as landing platform for pollen grain is :-
A.
Stigma
B.
Style
C.
Ovule
D.
Ovary
Q419 Allen Sexual Reproduction in Flowering Plants MCQ
In angiosperms functional megaspore is generally situated at :-
A.
Micropylar end
B.
Chalazal end
C.
Both
D.
None
Q420 Allen Sexual Reproduction in Flowering Plants MCQ
Micropyle in seed helps in the entry of:-
A.
Male gamete
B.
Pollen tube
C.
Water & air
D.
All
Q421 Allen Sexual Reproduction in Flowering Plants MCQ
The type of cells undergoing meiosis in the flowers are:-
A.
Microspore mother cells & megaspore mother cell
B.
Epidermal cells
C.
Tapetal cells
D.
Placental cells
Q422 Allen Sexual Reproduction in Flowering Plants MCQ
Synergids help in:-
A.
Pollen tube entry into embryo sac
B.
Endosperm formation
C.
Embryo sac nutrition
D.
Both 1 & 3
Q423 Allen Sexual Reproduction in Flowering Plants MCQ
Chasmocleistogamous flowers are present in:-
A.
Viola (common pansy)
B.
Oxalis
C.
Commelina
D.
All of the above
Q424 Allen Sexual Reproduction in Flowering Plants MCQ
Although in most of species fruits are result of fertilisation, there are a few species in which fruit develops without fertilisation - process is known as:-
A.
Parthenocarpy
B.
Parthenogenesis
C.
Amphimixis
D.
Apomixis
Q425 Allen Sexual Reproduction in Flowering Plants MCQ
One of the male gamete moves towards the egg cell & fuses with it, the process is known as:
A.
Syngamy
B.
Triple fusion
C.
Double fertilization
D.
Autogamy