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plant sperm
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∙ 12y ago
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Is it true most bacteria produce pollen to make seeds?
No, they do not. They reproduce by budding. Pollen is produced by flowering plants.
Can the pollen from a bouquet of flowers on display inside the house make allergies worse?
yes, most plant allergies are to the pollen
Do all plants need pollinators?
They can't. This is because their pollen cells have different numbers of chromosomes, and therefore reproduction cannot occur. In order for flowers to breed, the pollinator must have the same number of chromosomes in its pollen cells as the flower receiving the pollen.
Why are no chloroplasts present in these pollen grains?
In most angiosperms (flowering plants), chloroplasts are maternally-inherited. Pollen grains (male seed) do not contain chloroplasts.
Why can flowering plants be fertilized without water?
The male gametes in most of the non-flowering plants are motile and these are carried to the female gamete by their own movement in presence of water.
Where are a plants sperm cells located before fertilization occurs?
When a pollen grain is immature male gametophyte, it has two cells ,a generative cell and a tube cell. A pollen grain becomes a mature male gametophyte when the generative cell divides by mitosis to form two sperm cells. In most species, this process occures after the pollen grain lands on the stigma of a carpel and the pollen tube begins to form. $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Why do grasses produce many pollen grain?
Like most plants, grass uses sexual reproduction in the form of pollen to grow more. Because this pollen is spread by wind, there needs to be quite a bit of it for the pollen to reliably seed many flowers.
What is the function of the pollen tube?
The pollen tube of most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the stigma (in flowering plants or angiosperms) to the ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms (conifers and gnetophytes).
What does a pollen grain look like?
The pollen for each kind of tree or flower is distinctive to that species, so there is no definite description for what pollen in general looks like - the grains aren't even all round; the size also varies: for instance, a grain of pollen from an elm tree (which is round) is about 20 micrometers in diameter, whereas a pollen grain from a Scots pine tree is kinda kidney shaped, & measures about 40 x 60 micrometers
How do you think pollen grains reach the pistil?
Pollen grains reach the pistil through pollination. The pollen grains are placed on the stigma of the carpal, and it transfers by wind, insects, built in mechanical discharge, and men. When the pollen lands on the stigma, it starts a series of chemical reactions that allow the pollen grain to produce a structure called the pollen tube. At the same time, the generative nucleus divides and produces two sperm nuclei. The pollen grain with the pollen tube and three nuclei is a mature gametophyte. The pollen tube works its way through the style of the carpal and touches the micropyte of the ovule. The sperm nuclei enter the embryo sac and fertilizes the egg and two polar nuclei, referred to as double fertilization. The fertilized egg develops into the immature seed plant, and the central cell develops into the endosperm, or food storage ares, of the seed.
What happens when two pollen grains land on the same stigma and after the first grain fertilises the ovule?
When a pollen grain lands on stigma, pollination occurs. The pollen grain germinates and the pollen tube grows through the style. The sperm nucleus travels through the tube (generated by the tube nucleus) and fuses with an ovule which then develops into an embryo (or zygote)
Is Good Luck Charlie appropriate for 8 year olds?
Apart from the kissing and lies that are present in the show, it is, for the most part, appropriate for eight year-olds and most parents wouldn't have a problem with it. I would say it is appropriate for most mature 8 year olds. One of the newer episodes is a swearing one but they never say the word.
What is the function of the pollen sacs in a flower?
the function of the pollen sac is to produce pollen (pollen grains). The pollen sac is the microsporangium of a seed plant in which pollen is produced. Most plants except coniferous plants contain four (4) pollen sacs.
Do Tweens were thongs?
It is not appropriate for tweens to wear thongs as they are considered more mature undergarments. It is important to promote age-appropriate clothing choices and prioritize comfort and modesty for this age group.
What was the most common was of threshing grain?
To beat the grain with a stick and turn it over and over again that is the most common way of threshing grain.
Why do people suffer from pollen allergies mainly during spring?
Because this is when pollen is most abundant in the environment
What was the most common way of threshing grain?
To beat the grain with a stick and turn it over and over again that is the most common way of threshing grain.
