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Obturators which help in fertilization are out growth of -
- a)Pollen tube
- b)Stigma
- c)Placenta or funiculus
- d)Pollen grains
Correct answer is option 'C'. Can you explain this answer?
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Obturators which help in fertilization are out growth of -a)Pollen tub...
Obturators which help in fertilization are outgrowth of:
Explanation:
The obturators, also known as pollination plugs, are structures that help in the process of fertilization in plants. They are outgrowths of a specific part of the flower. In the given options, the correct answer is option C, which states that the obturators are outgrowths of the placenta or funiculus.
Placenta or Funiculus:
The placenta or funiculus is a part of the flower that connects the ovule to the ovary. It plays a crucial role in the development and nourishment of the ovule. In some plants, the placenta or funiculus also produces obturators, which are specialized structures that aid in fertilization.
Functions of Obturators:
The obturators have several functions in the process of fertilization, including:
1. Prevention of self-pollination: The obturators act as physical barriers that prevent self-pollination by blocking the path of the pollen tube.
2. Promotion of cross-pollination: By blocking the pollen tube, the obturators promote cross-pollination, which is the transfer of pollen from one flower to another.
3. Protection of female reproductive structures: The obturators protect the female reproductive structures, such as the stigma and ovary, from damage or interference during the process of pollination.
4. Control of pollen tube growth: The obturators regulate the growth of the pollen tube, directing it towards the appropriate location for fertilization.
In conclusion, the obturators are outgrowths of the placenta or funiculus in plants. They play a crucial role in the process of fertilization by preventing self-pollination, promoting cross-pollination, protecting female reproductive structures, and controlling the growth of the pollen tube.
Explanation:
The obturators, also known as pollination plugs, are structures that help in the process of fertilization in plants. They are outgrowths of a specific part of the flower. In the given options, the correct answer is option C, which states that the obturators are outgrowths of the placenta or funiculus.
Placenta or Funiculus:
The placenta or funiculus is a part of the flower that connects the ovule to the ovary. It plays a crucial role in the development and nourishment of the ovule. In some plants, the placenta or funiculus also produces obturators, which are specialized structures that aid in fertilization.
Functions of Obturators:
The obturators have several functions in the process of fertilization, including:
1. Prevention of self-pollination: The obturators act as physical barriers that prevent self-pollination by blocking the path of the pollen tube.
2. Promotion of cross-pollination: By blocking the pollen tube, the obturators promote cross-pollination, which is the transfer of pollen from one flower to another.
3. Protection of female reproductive structures: The obturators protect the female reproductive structures, such as the stigma and ovary, from damage or interference during the process of pollination.
4. Control of pollen tube growth: The obturators regulate the growth of the pollen tube, directing it towards the appropriate location for fertilization.
In conclusion, the obturators are outgrowths of the placenta or funiculus in plants. They play a crucial role in the process of fertilization by preventing self-pollination, promoting cross-pollination, protecting female reproductive structures, and controlling the growth of the pollen tube.
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Obturators which help in fertilization are out growth of -a)Pollen tub...
The correct answer is option 'C', which states that obturators that help in fertilization are outgrowths of the placenta or funiculus. Let's understand this in detail:
Placenta and Funiculus:
The placenta and funiculus are both parts of the female reproductive system in flowering plants. The placenta is a tissue found within the ovary, while the funiculus is a stalk-like structure that connects the placenta to the ovule. These structures play important roles in the fertilization process.
Function of Obturators:
Obturators are specialized structures that aid in the process of fertilization in flowering plants. They are outgrowths or extensions of the placenta or funiculus. The term "obturators" is derived from the Latin word "obturare," which means to close or block.
Role in Fertilization:
During pollination, pollen grains are transferred from the anther (male reproductive organ) to the stigma (female reproductive organ). The pollen grains then germinate and grow a structure called a pollen tube, which acts as a conduit for the sperm cells to reach the ovule.
The obturators, which are located at the base of the style (the elongated part of the pistil), play a crucial role in guiding the pollen tube towards the micropyle (the opening of the ovule). They prevent the pollen tube from entering the wrong openings and redirect it towards the micropyle, where fertilization can occur.
The obturators achieve this by blocking the entry of the pollen tube into other openings, such as the nectaries or the stigma surface. They provide a clear pathway for the pollen tube to follow, ensuring that the male gametes reach the female gametes for successful fertilization.
In some plant species, the obturators may also secrete substances that attract and guide the pollen tube towards the micropyle. This enhances the efficiency of fertilization and increases the chances of successful reproduction.
Overall, obturators are important structures derived from the placenta or funiculus that guide the pollen tube towards the micropyle, ensuring proper fertilization in flowering plants.
Placenta and Funiculus:
The placenta and funiculus are both parts of the female reproductive system in flowering plants. The placenta is a tissue found within the ovary, while the funiculus is a stalk-like structure that connects the placenta to the ovule. These structures play important roles in the fertilization process.
Function of Obturators:
Obturators are specialized structures that aid in the process of fertilization in flowering plants. They are outgrowths or extensions of the placenta or funiculus. The term "obturators" is derived from the Latin word "obturare," which means to close or block.
Role in Fertilization:
During pollination, pollen grains are transferred from the anther (male reproductive organ) to the stigma (female reproductive organ). The pollen grains then germinate and grow a structure called a pollen tube, which acts as a conduit for the sperm cells to reach the ovule.
The obturators, which are located at the base of the style (the elongated part of the pistil), play a crucial role in guiding the pollen tube towards the micropyle (the opening of the ovule). They prevent the pollen tube from entering the wrong openings and redirect it towards the micropyle, where fertilization can occur.
The obturators achieve this by blocking the entry of the pollen tube into other openings, such as the nectaries or the stigma surface. They provide a clear pathway for the pollen tube to follow, ensuring that the male gametes reach the female gametes for successful fertilization.
In some plant species, the obturators may also secrete substances that attract and guide the pollen tube towards the micropyle. This enhances the efficiency of fertilization and increases the chances of successful reproduction.
Overall, obturators are important structures derived from the placenta or funiculus that guide the pollen tube towards the micropyle, ensuring proper fertilization in flowering plants.
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Obturators which help in fertilization are out growth of -a)Pollen tubeb)Stigmac)Placenta or funiculusd)Pollen grainsCorrect answer is option 'C'. Can you explain this answer?
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