The pollen grains of rice and wheat lose their viability in ___ minutes of their release.
(1) 30
(2) 10
(3) 60
(4) 90
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAfter double fertilizaton, a mature ovule has
(1) 1 diploid and 1 haploid cell
(2) 1 diploid and 1 triploid cell
(3) 2 haploid and 1 triploid cell
(4) 1 haploid and 1 triploid cell
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHow many haploid nuclei are present in a mature pollen grain?
(1) One
(2) Two
(3) Three
(4) Four
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is the correct sequence of the formation of female gametophyte in angiosperms?
(1) Nucellus, megapore tetrad, megaspore mother cell, megaspore, female gametophyte
(2) Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte
(3) Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte
(4) Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrimary endosperm nucleus (PEN) is formed by the fusion of
(1) 2 polar nuclei + 1 synergid cell nucleus
(2) 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleuus
(3) 2 polar nuclei + 1 male gamete nucleus
(4) 2 antipodal cell nuclei + 1 male gamete nucleus
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch column I with column II and select the correct option from the given codes.
|
Column - I |
|
Column - II |
A. |
Parthenocarpy |
(i) |
Seed formation without fertilization |
B. |
Polyembryony |
(ii) |
More than one embryo in same seed |
C. |
Apomixis |
(iii) |
Seedless fruits without fertilization |
D. |
Somatic embryogenesis |
(iv) |
Embryo develops from a somatic cell |
(1) A - (iv), B - (ii), C - (iii), D - (i)
(2) A - (iii), B - (ii), C - (i), D - (iv)
(3) A - (i), B - (iv), C - (iii), D - (ii)
(4) A - (ii), B - (iii), C - (i), D - (iv)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.
(1) A - Connective tissue, B - Pollen grains, C - Endothecium
(2) A - Endothecium, B -Connective tissue, C - Pollen grains
(3) A - Pollen grains, B - Connective tissue, C - Endothecium
(4) A - Endothecium, B - Pollen grains, C - Connective tissue
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the option that contains all plants which produce non-endospermic seeds.
(1) Gram, Pea, Bean, Groundnut
(2) Castor, Peanut, Orchid, Wheat
(3) Coconut, Walnut, Wheat, Gram
(4) Castor, Maize, Coconu, Orchid
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPollination in Rafflesia is occurred by
a. carrion flies
b. elephant
c. bat
d. crow
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCensar mechanism of seed dispersal is found in
(1) Papaveraceae
(2) Liliaceae
(3) Leguminosae
(4) Rosaceae
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology