Difference between vegetative cell and generative cell ???? whts der role

VEGETATIVE CELL:-

The mature pollen grain consists of a vegetative cell and generative cell. The vegetative cell performs the metabolic functions, stores reserve food for the pollen grain and delivers the gametes to the embryo sac of the Ovule. The generative cell produces two sperms, one fertilizes egg to produce embryo and other fuses with polar nuclei to produce endosperm respectively.

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GENERATIVE CELL:- 

A cell of the male gametophyte or pollen grain in seed plants that divides to give rise directly or indirectly to sperm.

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THE VEGETATIVE CELL IS BIGGER HAS ABUNDANT FOOD RESERVE AND A LARGE IRREGULARLY SHAPED NUCLEUS.

THE GENERATIVE CELL IS SMALL AND FLOATS IN THE CYTOPLASM OF THE VEGETATIVE OF THE VEGETATIVE CELL

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THE VEGETATIVE CELL IS BIGGER HAS ABUNDANT FOOD RESERVE AND A LARGE IRREGULARLY SHAPED NUCLEUS.

THE GENERATIVE CELL IS SMALL AND FLOATS IN THE CYTOPLASM OF THE VEGETATIVE OF THE VEGETATIVE CELL

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Vegetative cell is bigger , has abundant food reserve and a large irregular shaped nucleus while generative cell is small ,spindle shaped has dense cytoplasm and nucleus..
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The generative cell in the pollen grain produces 2sperm cells whereas the veg. cell produces an elongated pollen tube, gametiphytic cell, to deliver the male gamete to the embryo sac.
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The generative cell in the pollen grain produces 2 sperm cells & the veg. cell produces an elongated pollen tube, gametophytic cell, to deliver the male gamete to the embryo sac.
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when the pollen grain become mature it contain two cell 
   Vegetative cell :----- It is bigger in size and have abundant food reserve and its nucleus size is also large .
     Generative cell :------ It is smaller in size and float in cytoplasm of vegetative cell .
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Please find this answer

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vegetative cell helps in nutrition of generative cell
generative cell helps in formation of two haploid male gametes
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Vegetative cell is large,has abundant reserve food,irregular shaped nucleus.
While on the other hand,generative cell are smaller in size,floats on the cytoplasm of the vegetative cell.
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number of chromosome in generative cell
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Reproductive Ability: Vegetative cell is non-reproductive whereas generative cell is reproductive. Size: Vegetative cell is larger as compared to the generative cell. Function: Vegetative cell forms a pollen tube to deliver male gametes to embryo sac. Generative cell forms sperm cells or male gametes.
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