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What contains two pollen sacs with pollen grains?
A pollen sac is found in the anther of a flower, which contains pollen grains. Each anther typically has two pollen sacs, known as microsporangia, where pollen grains are produced via meiosis.
What is the male part of the flower that produces and stores pollen?
Plants that reproduce sexually have male and female parts, which are located in the flowers. Several of the male structures, called stamens, surround a female structure called the pistil. The stamens produce sperm cells that fertilize egg cells contained in the base of a pistil, often one that is located in a different plant. The male part of the flower produces pollen grains which contains 2 male sex cells each that fertilise the female sex cell.
What process happens when pollen falls on a flowers pistil?
When pollen falls on a flower's pistil, a process called pollination occurs. The pollen travels down the pistil to reach the ovary, where fertilization takes place. This fertilization leads to the formation of seeds, which eventually develop into fruits.
Where do pollen grains go?
Out of hundreds and thousands of pollen grains produced by each flower a few land on the stigma during pollination and others just wither away.
The nucleus in each cell in the stem of a plant contains 32 chromosomes How many chromosomes are there in the nuclei of its pollen grains?
Pollen grains are produced via meiosis, which halves the chromosome number. Therefore, the pollen grains would contain 16 chromosomes.
Why do conifers produce more pollen than grains used to fertilize conifer eggs?
Because conifers are pollinated by wind hence to ensure fertilization of each egg clouds of pollen grains are formed.
What parts of flowers are diploid?
The sporophyte generation of a flower is diploid, meaning that it has two sets of chromosomes in each cell. This includes the petals, sepals, stamens, and pistil. The gametophyte generation, which produces gametes through meiosis, is haploid.
What structures are found in the anthers?
The female structure of the flower is the gynoecium that is made up of the ovary, style and stigma. The ovary produces the ovule. The male structure is the androecium. It is made up of the filament and anther. The filaments bear the anthers. The anthers produce pollen.
When a plant with the GgBb genotype produces pollen what genotypes will be found among the pollen grains?
The plant with the GgBb genotype will produce four types of pollen grains: GB, Gb, gB, and gb. These combinations arise from the different combinations of alleles for each gene in the genotype.
What contains egg cells in a flower?
An ovule. Inside the petals are a flower's sexual organs, its stamens and pistil. The pistil consist of three parts: stigma, style, and ovary. The stigma traps pollen grains that are needed for fertilization of eggs. The style is a narrow stalk that supports the stigma. An ovary at the base of the style contains one or more ovules, and each ovule holds one egg cell.
What do you call the yellow powder in flowers?
You are describing pollen grains. Each grain contains a male gamete that can fertilize the female ovule, to which pollen is transported by the wind, insects, or other animals.
Why at least 10 pollen grains are required to fertilise 10 ovules present in a particular carpel?
One each.
