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Sexual Reproduction In Flowering Plants

554 Questions Start Allen Test
All Exams Allen Errorless
Q376 Allen PYQ MCQ
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
A.
Hydrilla
B.
Yucca
C.
Banana
D.
Viola
Q377 Allen PYQ MCQ
Is some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as :-
A.
Autogamy
B.
Parthenocarpy
C.
Syngamy
D.
Parthenogenesis
Q378 Allen PYQ MCQ
Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ?
A.
Ovary develops into fruit
B.
Zygote develops into embryo
C.
Central cell develops into endosperm
D.
Ovules develop into embryo sac
Q379 Allen PYQ MCQ
Persistent nucellus in the seed is known as :-
A.
Chalaza
B.
Perisperm
C.
Hilum
D.
Tegmen
Q380 Allen PYQ MCQ
What is the fate of the male gametes discharged in the synergid?
A.
One fuses with the egg, other(s) degenerate(s) in the synergid.
B.
All fuse with the egg.
C.
One fuses with the egg, other(s) fuse(s) with synergid nucleus.
D.
One fuses with the egg and other fuses with central cell nuclei.
Q381 Allen PYQ MCQ
Which is the most common type of embryo sac in angiosperms?
A.
Tetrasporic with one mitotic stage of divisions
B.
Monosporic with three sequential mitotic divisions
C.
Monosporic with two sequential mitotic divisions
D.
Bisporic with two sequential mitotic divisions
Q382 Allen PYQ MCQ
What type of pollination takes place in Vallisneria?
A.
Pollination occurs in submerged condition by water
B.
Flowers emerge above surface of water, and pollination occurs by insects.
C.
Flowers emerge above water surface, and pollen is carried by wind.
D.
Male flowers are carried by water currents to female flowers at surface of water
Q383 Allen PYQ MCQ
In which one of the following, both autogamy and geitonogamy are prevented?
A.
Wheat
B.
Papaya
C.
Castor
D.
Maize
Q384 Allen PYQ MCQ
In water hyacinth and water lily, pollination takes place by :-
A.
insects and water
B.
insects or wind
C.
water currents only
D.
wind and water
Q385 Allen PYQ MCQ
The body of the ovule is fused within the funicle at:-
A.
Chalaza
B.
Hilum
C.
Micropyle
D.
Nucellus
Q386 Allen PYQ MCQ
The plant parts which consist of two generations one within the other :-
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
A.
a and d
B.
a only
C.
a, b and c
D.
c and d
Q387 Allen PYQ MCQ
Which of the following is incorrect for wind -pollinated plants ?
A.
Well exposed stamens and stigma
B.
Many ovules in each ovary
C.
Flowers are small and not brightly coloured
D.
Pollen grains are light and non-sticky
Q388 Allen PYQ MCQ
Vegetative propagules in Agave is termed as:-
A.
Rhizome
B.
Bulbil
C.
Offset
D.
Eye
Q389 Allen PYQ MCQ
Male and female gametophytes do not have an independent free living existence in :-
A.
Pteridophytes
B.
Algae
C.
Angiosperms
D.
Bryophytes
Q390 Allen PYQ MCQ
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :-
A.
Xenogamy
B.
Geitonogamy
C.
Chasmogamy
D.
Cleistogamy
Q391 Allen PYQ MCQ
A typical angiosperm embryo sac at maturity is :-
A.
8-nucleate and 7-celled
B.
7-nucleate and 8-celled
C.
7-nucleate and 7-celled
D.
8-nucleate and 8-celled
Q392 Allen PYQ MCQ
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
A.
Poaceae ; Rosaceae
B.
Poaceae; Leguminosae
C.
Poaceae; Solanaceae
D.
Rosaceae ; Leguminosae
Q393 Allen PYQ MCQ
Identify the incorrect statement related to Pollination:-
A.
Pollination by wind is more common amongst abiotic pollination
B.
Flowers produce foul odours to attract flies and beetles to get pollinated
C.
Moths and butterflies are the most dominant pollinating agents among insects
D.
Pollination by water is quite rare in flowering plants
Q394 Allen PYQ MCQ
Given below are two statements:- Statement I : Cleistogamous flowers are invariably autogamous Statement II : Cleistogamy is disadvantageous as there is no chance for cross pollination. In the light of the above statements, choose the correct answer from the options given below:
A.
Both Statement I and Statement II are incorrect
B.
Statement I is correct but Statement Il is incorrect
C.
Statement I is incorrect but Statement II is correct
D.
Both Statement I and Statement Il are correct
Q395 Allen PYQ MCQ
The residual persistent part which forms the perisperm in the seeds of beet is :-
A.
Calyx
B.
Endosperm
C.
Nucellus
D.
Integument
Q396 Allen PYQ MCQ
Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops?
A.
Polyembryony will be seen and each seed will produce many plantlets
B.
Seeds of hybrid plants will show longer dormancy
C.
Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year
D.
There will be segregation of the desired characters only in the progeny BSR183
Q397 Allen PYQ MCQ
What is the function of tassels in the corn cob?
A.
To trap pollen grains
B.
To disperse pollen grains
C.
To protect seeds
D.
To attract insects
Q398 Allen PYQ MCQ
Large, colourful, fragrant flowers with nectar are seen in:
A.
bird pollinated plants
B.
bat pollinated plants
C.
wind pollinated plants
D.
insect pollinated plants
Q399 Allen PYQ MCQ
In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:
A.
Antipodals, synergids, and primary endosperm nucleus
B.
Synergids, Zygote and Primary endosperm nucleus
C.
Synergids, antipodals and Polar nuclei
D.
Synergids, Primary endosperm nucleus and zygote
Q400 Allen PYQ MCQ
Transfer of pollen grains from anther to stigma of another flower of same plant is known as :
A.
Geitonogamy
B.
Xenoga
C.
Autogamy
D.
Cleistogamy