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Development of Pollen in Cyperaceae
In all members of the Cyperaceae out of the four nuclei formed after meiosis, only one functions, the others degenerate. The functional nucleus remains in the centre and the three non-functional nuclei are pushed to a side. In Cyphers, Kyllinga, and Scirpus the non-functional nuclei are separated from the functional nucleus by a wall. Walls are also laid between the nonfunctional nuclei. The functional nucleus divides to form a vegetative cell and a generative cell.
The non-functional nuclei may also begin to divide but the divisions are abortive, and they eventually degenerate. Thus in a tetrad, only one pollen grain is functional. This feature is similar to the behavior of megaspores in the development of monosporic embryo sac.
What is retrograde peri-implantitis? Retrograde peri-implantitis has been described by Misch as implant failure probably due to bone microfractures caused by premature implant
The secondary protein structure is produced by the manner its amino acids interact by intermolecular bond. These interactions make a spatial conformation of the polypeptide filamen
Define Fortification to prevention of iron deficiency anaemia? Food fortification is one of the alternatives that ensure consumption of the nutrient regularly in daily diet. Fo
Write in 5-6 lines about food pyramid. The diabetes food pyramid divides food into six groups. These groups vary with each other on the basis of si-e occupied in the pyramid.
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what is phylum protozoa ?
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What is cytoskeleton? What are its main constituents in animal cells? Ans) Cytoskeleton is the cytoplasmic structure that handles the cell, keeps its shape and fixates and moves
How can I become involved in supporting brain research? A. Here are some ways which you can support brain research: Join in activities of Brain Awareness Week. Dona
what is the importance of lignin in xylem formation
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