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Sexual Reproduction in flowering Plants

Multiple Choice Questions

81.

The fleshy receptacle of syconus of fig encloses number of

Achenes
Samaras
Berries
Mericarps

82.

Unisexuality of flowers prevents

Autogamy, but not geitonogamy
Both geitonogamy and xenogamy
Geitonogamy, but not xenogam
Autogamy and geitonogamy

83.

Rarely among angiosperms, the pollen grains influenced the endosperm. This is called as

Meta xenia
Nemec phenomenon
Xenia
Mesogamy

84.

In the given diagram, parts labelled as A, B, C, D, E and F are respectively identified as

Synergids, polar nuclei, central cell, antipodals, filiform apparatus and egg
Polar nuclei, egg, antipodals, central cell, filiform apparatus and synergids
Egg, synergids, central cell, filiform apparatus, antipodals and polar nuclei
Central cell, polar nuclei filiform apparatus, antipodals, synergids and egg

85.

When two unrelated individuals or lines are crossed, the performance of F₁ hybrid in often superior to both of its parents. This phenomenon is called

Transformation
Heterosis
Splicing
Meta Morphosis

86.

An irregular mode of reproduction resulting in the development of an embryo without fertilization is called

(I) parthenogenesis

(II) apogamy

(III) sporophytic budding

Select the correct answer using the code given below.

Only I
Only II
II and III
I, II and III

87.
Compare the statement I and II and choose the correct option.
Statement I In the flowering plants due to higher accumulation of auxins dormancy of lateral buds occurs.
Statement II In Maryland Mammoth (a tobacco variety) flowering occurred at a different time at different latitude due to gibberellins concentration.

Statement I is true, but II is false

Statement I is false, but II is true

Both statements are true

Both statements are false

Statement I is true, but II is false

Auxin is responsible for apical dominance in apical buds, which inhibits the lateral buds to grow. Plants require a certain day length to flower. This relative length of day and night needed for flowering is called as photoperiod. The effect of photoperiod or daily duration of light hours and dark periods on the growth and development of plants, especially flowering, is called photoperiodism. This phenomenon was first discovered by Garner and Allard (1920, 1922) on Maryland Mammoth variety of tobacco. They observed that the Maryland Mammoth could be made to flower only by reducing the light hours with artificial darkening. It could be made to remain vegetative in winter by providing extra light.