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प्रश्न
Identify the incorrect pair
विकल्प
sporopollenin - exine of pollen grain
tapetum – nutritive tissue for developing microspores
Nucellus – nutritive tissue for developing embryo
obturator – directs the pollen tube into micropyle
उत्तर
Nucellus – nutritive tissue for developing embryo
संबंधित प्रश्न
(a) Explain the events after pollination leading to the formation of a seed in angiosperms.
(b) Mention the ploidy levels of the cells of different parts of an albuminous seed.
What are the advantages of the following in the flower to the plant concerned?
Fragrant nectar
What is the function of the pollen tube? Explain it with the help of a diagram.
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
Name the parts labelled 1, 2, 3, 4 and 5.
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
What happens to the part labelled '5' during the process?
What is the significance of the dispersal of seeds? Give any two points.
Explain the pollination process in maize.
Give any four points of significance of double fertilization.
Syngamy results in the formation of ______.
In angiosperms, for formation of which of the following triple fusion is necessary?
If the cells of the nucellus in the angiosperm ovule contain 24 chromosomes, then ____________ chromosomes will be present in the endosperm of a self-pollinated flower.
Following diagram represents double fertilization. Identify the INCORRECT label.
The female gametophyte of a typical dicot at the time of fertilisation is ______.
Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? If yes, then how?
Identity the part of embryo sac which takes part in formation of primary endosperm nucleus during fertlisation
Name the following:
A diploid nucleus in central cell of embryo sac in plants.
Give a term for the following:
Fusion of male gamete and secondary nucleus in angiosperms.
