This is a topic that comes up from time to time for our subject matter specialists. Now, we have the full, extensive explanation as well as the solution for everyone who is interested!
When an anther opens, pollen grains are expelled via a location called the stomium, which is located in the anthers. It may be found in the groove that can be seen on each anther lobe. Therefore, the solution that is right is B.
What does Stomium look like in the anther?
Stomium is a single layer of specialised epidermal cells that joins adjacent anther walls and serves as the final breakage site for anther dehiscence. Stomium is the only part of the anther that does not dehisce (Keijzer, 1987).
Where exactly can one find Stomium?
The point at which a sporangium or pollen sac breaks open to release its contents (the spores or the pollen, respectively). It is often a region of cells with thin walls that have ruptured as a result of the surrounding tissue becoming drier. In ferns, the stomium may be found under the annulus, while in seed plants, it can be found in between the pairs of pollen sacs.
How does stomium come to be?
The stomium is produced when epidermal cells inside the anther differentiate to create a single cell area. The placement of this region controls the position of the anther opening (Fig. 3).
What function does the endothecium serve in the anther?
The generation of pollen grains in the anther is the primary role played by the endothecium of the anther. Endothecium is the name given to the cell layer that lines the lumens of anthers, which plays a role in the maturation of pollen. It is responsible for the secretion of the materials that are necessary for the development of mature pollen grains in plants.
Found 36 questions connected to this topic.
What what is the endothesium? !!-!! : the inner lining of an anther that has developed fully.
What function does sporopollenin serve in the cell?
The pollen grains are shielded from the elements by sporopollenin, which prevents damage from factors like as high temperatures and precipitation. Sporopollenin is the most durable organic substance ever discovered on Earth, and it is responsible for the formation of the exine’s outer coating.
What is the response of Stomium?
1: the cells of the annulus that have thin walls and indicate the line or area where dehiscence occurs in a fern sporangium. 2: the aperture in an anther, often between the cells of the lip, through which the process of dehiscence takes place.
What exactly is Pollenkitt constructed of?
Pollen kitt is composed of lipids and carotenoids from a chemical standpoint.
How does an anther open its mouth?
The last function of the anther, known as dehiscence, is responsible for the discharge of pollen grains into the environment. This process is carefully linked with the differentiation of the pollen, the growth of the floral bud, and the opening of the flower. At a particular location, the wall of the anther breaks. … The process of dehiscence takes place in the area of the anther known as the stomium.
Which layer of the Microsporangium is the Stomium responsible for forming?
The epidermis and stomium are both products of the initial layer of development. The mature anther has an epidermis that has been extensively stretched and flattened, and this epidermis forms the outermost layer of the anther. The stomium may be found in the middle of each anther lobe, in between the two locules.
What exactly are the terms annulus and Stomium?
‘The annulus is composed of cells that have extremely thick cell walls, and it appears as a band of cells.”The stomium is a region of thin-walled cells in certain spore-producing structures that ruptures to release the spores.”The annulus occurs as a band of cells.”The stomium is a region of thin-walled cells in certain spore-producing structures
Where exactly may one find the tapetum?
Within the anthers of flowering plants, there is a specialised layer of nutritive cells known as the tapetum. This layer of cells may be found between the sporangenous tissue and the anther wall. In addition to being a source of precursors for the pollen coat, tapetem is essential to the nourishment and growth of pollen grains. It also plays a role in the formation of pollen grains.
What is there to see on the anther?
The anther is made up of four sac-like structures known as microsporangia, which are responsible for the production of pollen. Nectaries are little secretory structures that are often present at the base of the stamens. These structures provide pollinating insects and birds the opportunity to get food rewards. The collective term for a flower’s stamens is “androecium,” and it refers to the androecium as a whole. What is the name of the layer that is located deepest inside an anther wall?
The tapetum is the most superficial layer of the anther wall and is located immediately next to the sporogenous tissue.
What exactly is the 12th class of Stomium?
The stomium is a layer of epidermal cells with relatively thin cell walls that may be found near the line of dehiscence. Therefore, when it is time for the distribution of pollen grains, the anthers will only break and divide along this line of dehiscence. It is denoted by the letter ‘C’.
What exactly is a Malacophile?
Botanical term for the process of plant pollination that is carried out by snails.
Which pollen has the longest length?
On the plant Zostera, researchers discovered the pollen grain with the largest length. The Zostera pollen grains may be as long as 2500 micrometres in length. Because these grains are longer, the outer wall that surrounds them is thicker and more resilient. It is composed of cellulose and sporopollenin. Seagrass is really a species of the flowering plant genus Zostera, which is found in marine environments.
What exactly does the name Pollenkitt mean?
A material known as pollenkitt or pollen coat is deposited on the surface of the pollen of entomophilous flowers, which are blooms that are pollinated by insects. These flowers are also known as insect-pollinated flowers. Flowers that attract insects and animals to pollinate them often have vibrant colours, pleasant scents, and the ability to create nectar. Orchids, antirrhinum, primulas, and other similar plants are some examples.
What are some applications for stomium?
stomium A region of cells in a sporangium or pollen sac with weak cell walls. When the surrounding tissue dries, this region ruptures, releasing the spores or pollen grains contained therein.
What exactly do you mean when you say “Prothallus”?
1: the gametophyte of a pteridophyte (such as a fern), which is often a tiny, flat, green thallus that is linked to the soil by rhizoids. 2: a structure of a seed plant that is significantly decreased in size and corresponds to the pteridophyte prothallus.
What exactly does it mean to diplospory?
The situation known as diplospory is characterised by the formation of a diploid embryosac from megaspore mother cells in the absence of a typical meiotic division. E.g: Eupatorium. Structures and events that take place after fertilisation in plants are the focus of this concept.
What exactly is sporopollenin, and why is it such an essential component?
One of the biological polymers with the least potential for chemical reactivity is called sporopollenin. It plays a significant role in the construction of the sturdy exine walls that surround plant spores and pollen grains. It has a high degree of chemical stability and is often kept in good condition in sediments and soils.
What causes the formation of sporopollenin?
It has been hypothesised by Brooks and Shaw3 that the carotenoids found in the anthers of Lilium henryi serve as the precursors of sporopollenin, and that exine is produced by the oxidative polymerization of a combination of carotenoids and carotenoid esters that are present in the anther material.
Where exactly can you get sporopollenin in plants? What exactly is the meaning of it?
Plants have sporopollenin in their exine, which is found in the pollen grains. The following is its importance in relation to the chemical makeup of the substance: It is one of the organic substances that is capable of withstanding high temperatures, as well as strong acids and alkalis. There is currently no enzyme known that can break down sporopollenin.
Where is sporopollenin present in plants What is its significance?
Sporopollenin is present in the exine of pollen grains in plants. Its significance with reference to its chemical nature are as follows: It is one of the most resistant organic substance which can withstand high temperature, strong acids and alkali. No enzyme that degrades sporopollenin is so far known.