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What is the use of unusual ornaments on the outer wall of pollen grain?
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The purpose of a pollen grain on a flower?
The purpose of pollen is to transfer the male reproductive cells (sperm) to the female reproductive cells (ovules) and thus to allow sexual reproduction. Pollen can be so transferred by many methods - wind, gravity, insects, etc. The pollen receptive part of the flower (the stigma) is often sticky, or textured so the pollen will stick. Once attached the pollen grain grows a tube into the stigma and down the style into the ovule. This tube allows the male gametes to fertilise the ovule, creating a seed.
What is the Outer layer of grain?
The outer covering of the grain is called Husk. :) - HAO -
What is the scientific name of rice bran?
There is no scientific name for rice bran. Rice bran gets its name from the plant, which is the rice, Bran is the outer part of the grain.
What is unusual about the noble gases?
They have a full outer valence shell and are therefore stable. This means they do not react with other elements or form bonds as their electrons are held too strongly
How do the outer electrons in metal atoms differ from the outer electrons in nonmetal atoms?
Those electrons are called the valence electrons. They are the ones that can be transferred and form bonds with other atoms.
What are exine seeds?
In botany 'exine' is the outer coat, or the outer layer, of the wall of a pollen grain. It is composed of a durable organic polymer
The purpose of a pollen grain on a flower?
The purpose of pollen is to transfer the male reproductive cells (sperm) to the female reproductive cells (ovules) and thus to allow sexual reproduction. Pollen can be so transferred by many methods - wind, gravity, insects, etc. The pollen receptive part of the flower (the stigma) is often sticky, or textured so the pollen will stick. Once attached the pollen grain grows a tube into the stigma and down the style into the ovule. This tube allows the male gametes to fertilise the ovule, creating a seed.
What do you call the outer covering the grain?
The outer covering of the grain is called Husk.
What is the Outer layer of grain?
The outer covering of the grain is called Husk. :) - HAO -
Function of germ pore?
a pore in the outer wall of a spore or pollen grain through which the germ tube or pollen tube makes its exit on germination stoma, stomate, pore - a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
Grows from the pollen grain to the ovule?
Pollen tubes grow from the pollen grains to the ovules. Lipids on the surface of the stigma stimulate growth of the pollen tubes. Self sterile plants prevent themselves from growing seeds by not creating these lipids.
What is sporoderm?
Sporoderm is the outermost protective wall around the pollen grain or microspore. It is made up of many layers. The two main layers are Exine and Intine. Exine is outer while Intine is inner layer of sporoderm.
What is the outer covering of a kernel called?
The outer covering of the grain is called Husk.
What is the pollen case?
What is usually meant by pollen case is the outer protective coat of the pollen grain. It is a highly modified cell wall, with two layers. The interior layer is largely pectocellulose (a combination of pectin and cellulose) with a bit of callose, and the exterior is made of sporopollenin. Sporopollenin is so tough that its exact chemical structure has not been figured out. Atop the sporopollenin layer is a deposit of sticky goo made of pollenkitt and/or tryphine.
Since corn is a Grain-then is stone ground Grits-Whole grain?
No, corn is not a grain. It is a vegetable.
What is the meaning of self-fertilization?
The fertilization of a flower by pollen from the same flower and without outer aid; autogamy.
What is significance of evolution shown by he flagellated Cycas sperm?
Cycads and other gymnosperms do not have true flowers and their seeds are borne naked. All species of cycads are dioecious. The male reproductive structure, androstrobilus, consists of microsporophylls. Each microsporophyll produces a large quantity of pollen grains on its dorsal surface. The pollen is dispersed by wind or by insects to the gynostrobilus, the female reproductive structure. When a pollen grain lands on the gynostrobilus, it germinates and grows a pollen tube that extends to deep within the multicellular, female haploid gametophyte. Then a sperm cell of the pollen grain swims through the pollen tube using its whip-like tail, or flagella, and fertilizes the egg to form a zygote. The zygote eventually develops into an embryo, and then a seed. Cycad seeds are rich in starch and have a pigmented, fleshy outer layer known as the sarcotesta. The seeds are often dispersed by birds or mammals, which eat them for the nutritious sarcotesta, and later defecate the still-viable seed.
