Other articles where Generative nucleus is discussed: plant reproductive system: Angiosperms: …involves formation of a small generative cell and a tube cell. The generative cell may divide to form two sperm cells before the pollen grain (developing male gametophyte) is shed or while the pollen tube is growing during germination. The pollen grains of angiosperms have variously, and often ...
contact us7. Draft Tube. If reaction turbines are used, then draft tube is a necessary component which connects turbine outlet to the tailrace. The draft tube contains gradually increasing diameter so that the water discharged into the tailrace with safe velocity. At the end of draft tube, outlet gates are provided which can be closed during repair works.
contact usIn this issue of The Plant Cell, Punwani et al. (pages 2557–2568) show that the R2R3 Myb protein MYB98 functions as a transcriptional regulator of genes that are expressed in synergid cells and are required for formation of the filiform apparatus and pollen tube guidance.
contact us· The function of the stigma in a flower is as a pollen receptor. The stigma is a sticky tip on the top of a carpel. The stigma is contained inside of the pistil, which also contains the ovary, style and carpel. A pistil may have several carpels. The style is the part of the flower, also called a stalk, that allows pollen tubes to grow from grain.
contact us· The function of the anther is to produce and bear the pollen of the flower. This structure sits atop a structure called a filament, and together these two structure constitute the flower''s stamen. This is one of a typical flower''s two main sexual organs, the other being the pistil, which contains the plant''s …
contact usThe various functions of water in plants include: maintaining cell turgidity for structure and growth; transporting nutrients and organic compounds throughout the plant; comprising much of the living protoplasm in the cells; serving as a raw material for various chemical processes, including photosynthesis; and, through transpiration, buffering the plant against wide temperature fluctuations.
contact usPlant fibers such as cotton and linen are produced by the vascular tissue system of plants. The vascular tissue contains many long, slender cells that form long tubes and have walls that are reinforced by lignin.
contact usSieve tubes consist of sieve elements which are elongated cells, connected to each other via sieve plates to form a continous tube system that spreads out through the entire plant. Sieve plates are end walls containing large pores to provide a connection between adjacent sieve elements (for more information on sieve plates see link on the left).
contact usDraft tube will allow establishing a negative head at the outlet of the runner and hence a draft tube will help to increase the net head on the turbine. With the presence of draft tube, turbine may be placed above the tail race without any loss of net head. In doing so, it …
contact usSieve Tube Function. Phloem function is closely related to sieve tube structure. Since we encounter many problems to investigate sieve tubes without inducing artifacts, the in vivo structure of sieve tubes is still a matter of debate and so is the translocation mechanism. There is no doubt that translocation occurs as mass flow (click the link below to see a movie of phloem translocation), but ...
contact usThe cells that make up the xylem are adapted to their function: They lose their end walls so the xylem forms a continuous, hollow tube. They become strengthened by a substance called lignin .
contact us· Plants have transport systems to move food, water and minerals around. These systems use continuous tubes called xylem and phloem: - Xylem vessels carry water and minerals from the roots to the leaves. - Phloem tubes carry sugar & other organic nutrients made by plant from the leaves to the rest of the plant. Xylem vessels consist of dead cells.
contact usFunctions of Parts of Plants Function of Roots. A plant has roots that grow in the ground. This underground part plays a very important role in pulling the water and minerals so they can reach the plant. Furthermore, it also expands within the ground so …
contact us· https:// Learn the plant parts and functions in this science lesson for kids. You will learn about the roots, stems, leaves, flo...
contact usFunctions of Ovule. It plays an important role in the process of sexual reproduction. Once a pollen grain falls on the stigma of a flower of its similar species. In addition, it sends out a pollen tube below through the style. Then this tube enters inside the ovary and then reaches into the ovule of the plant.
contact us· Stomata are tiny openings or pores in plant tissue that allow for gas exchange. Stomata are typically found in plant leaves but can also be found in some stems. Specialized cells known as guard cells surround stomata and function to open and close stomatal pores.
contact usIn plant anatomy, there are two main types of sieve elements. Companion cells and sieve cells originate from meristems, which are tissues that actively divide throughout a plant''s lifetime. They are similar to the development of xylem, a water conducting tissue in plants whose main function is also transportation in the plant vascular system.
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contact us· Visit for more free science videos.A plant is made up of primarily five parts. These are –1. Root 2. Stem 3. Leaf 4. Flower 5. F...
contact us· What Is the Function of Companion Cells? Companion cells are parenchymal cells found within the phloem of flowering plants that manage the flow of nutrients through sieve tubes. Companion cells deliver ATP, proteins and other nutrients to sieve elements. This is due to the cytoplasm of sieve tubes lacking typical cell maintenance structures.
contact usA heat exchanger is a system used to transfer heat between two or more fluids.Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural ...
contact us· Plants are pretty amazing. Their form follows their function. In this short video about plants we explore underwater plants, bromeliads, strangler figs and m...
contact us· Grade 7 Science Chap 2Objectives: 1.WWBAT identify different parts of Seed and their function.2. WWBAT identify different types of Roots and their function. ...
contact us· The function of the style is to check compatibility and judge whether the pollen that lands on the flower can fertilize the plant. Pollen with male genetic information lands on the flower''s stigma and is secured there due to the stickiness of the stalk. As the pollen germinates on the stigma, it creates a pollen tube, which is used to burrow ...
contact usThe main function of the draft tube is to convert the Kinetic energy of water into pressure energy. The draft tube brings the pressure of the water exiting the turbine back to atmospheric pressure levels by reducing the velocity of the water at the tailrace. Cast steel and cemented concrete are the materials used to build the draft tube.
contact usStructure-function relationships of phloem sieve tubes. Phloem consists of two types of cells: Sieve tube member (sieve tube element cell) and companion cells. Companion cells are involved in ATP production; Sieve tube member cells transport the nutrients; Plants …
contact usSieve tube, in flowering plants, elongated living cells (sieve-tube elements) of the phloem, the nuclei of which have fragmented and disappeared and the transverse end walls of which are pierced by sievelike groups of pores (sieve plates).They are the conduits of food (mostly sugar) transport.. In nonangiospermous vascular plants—e.g., gymnosperms and ferns—rows of sieve cells, showing ...
contact us· In plant cells, microtubules form at many sites within the cell, but in animal cells, microtubules begin at the centrosome, an organelle near the nucleus of the cell that also participates in cell division. The minus end represents the attached end of …
contact usPlants are multicellular eukaryotes with tissue systems made of various cell types that carry out specific functions. Plant tissue systems fall into one of two general types: meristematic tissue and permanent (or non-meristematic) tissue. ... Phloem tissue is composed of sieve-tube cells, companion cells, phloem parenchyma, and phloem fibers.
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