Tag: reproductive health
Questions Related to reproductive health
The function of anther is?
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Produce Ubisch bodies
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Produce pollen grains
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Store and protect pollen grains
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All the above
In ovule, archesporial cell differentiates from nucellus.
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At chalazal region
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Middle of nucellus
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Laterally near endothelium
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Hypodermally in the micropylar region
Study of formation, growth and development of new individual from an egg is?
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Apomixis
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Embryology
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Embryogeny
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Cytology
Abundant occurrence of fossilised pollen grains is due to resistant.
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Lignocellulose
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Sporopollenin
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Pectocellulose
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Pectolignin
Abundant occurrence and preservation of the fossil pollen grains result from the extremely resistant nature of the outer wall of the pollen grains. This wall is the exine and composed of a compound commonly known as sporopollenin. It originates from the polymerization of carotenoids and carotenoid esters.
Thus the correct answer is B.
Which of the following pair has haploid structures?
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Nucellus and antipodal cells
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Antipodal cells and egg cell
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Antipodal cells and megaspore mother cell
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Nucellus and primary endosperm nucleus
Pollen grain represents.
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Spore
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Zygote
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Immature male gametophyte
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Male gamete
Point out the odd one.
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Nucellus
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Embryo sac
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Micropyle
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Pollen grain
Ovule is tritegmic in.
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Juglans
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Casuarina
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Opuntia
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Asphodelus
Exine of pollen grain is formed of.
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Callose
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Pecto-cellulose
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Ligno-cellulose
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Sporopollenin
The pollen is having two layers. The tough outer layer is referred to as the exine. This sophisticated and complex outer layer is having a compound known as sporopollenin. It is waterproof, resistant to the deterioration and very stiff as well. This shell is actually one of nature's most advanced polymers. It ensures that the tender cells must have a strong chance of survival.
Thus the correct answer is option D.
Crassinucellate ovule has.
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Ill developed nucellus
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Partially developed nucellus
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Well developed nucellus
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No nucellus