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The arrangement of the nuclei in a normal embryo sac in the dicot plants is
[2006]
- a)3 + 2 + 3
- b)2 + 3 + 3
- c)3 + 3 + 2
- d)2 + 4 + 2
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The arrangement of the nuclei in a normal embryo sac in the dicot plan...
In a dicot plant general arrangement of nuclei in the embryosac is that 3 nuclei in 3 cells of egg apparatus (one egg cell & 2 synergids) at micropylar end and 2 polar nuclei in almost middle region and 3 nuclei in the form of antipodals at the distal end from micropyle, towards nucellus. So total nuclei 3 + 2 + 3.
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The arrangement of the nuclei in a normal embryo sac in the dicot plan...
**Embryo Sac in Dicot Plants**
The embryo sac is the female gametophyte in flowering plants (angiosperms). It is formed inside the ovule and contains the egg cell, synergids, antipodal cells, and the central cell. The arrangement of the nuclei in a normal embryo sac in dicot plants is as follows:
**Arrangement of Nuclei:**
- The embryo sac in dicot plants has a total of 8 nuclei.
- The nuclei are arranged in three distinct groups: the egg apparatus, the central cell, and the antipodal cells.
**Egg Apparatus:**
- The egg apparatus consists of three nuclei: two synergids and one egg cell.
- The synergids are located at the micropylar end of the embryo sac and play a role in guiding the pollen tube towards the egg cell.
- The egg cell is positioned between the two synergids and is the female gamete that fuses with the male gamete (sperm) during fertilization.
**Central Cell:**
- The central cell is the largest cell in the embryo sac and contains two polar nuclei.
- The polar nuclei are located in the center of the central cell and are involved in the process of double fertilization.
- Double fertilization is a unique feature of angiosperms where one sperm fertilizes the egg cell to form the zygote, and the other sperm fuses with the polar nuclei to form the endosperm.
**Antipodal Cells:**
- The antipodal cells are located at the chalazal end of the embryo sac and usually consist of three cells.
- The function of the antipodal cells is not well understood, but they are thought to play a role in nourishing the developing embryo.
**Conclusion:**
In conclusion, the arrangement of nuclei in a normal embryo sac in dicot plants is 3-2-3, with three nuclei in the egg apparatus (two synergids and one egg cell), two nuclei in the central cell (two polar nuclei), and three nuclei in the antipodal cells. This arrangement is characteristic of dicot plants and is important for the process of fertilization and embryonic development.
The embryo sac is the female gametophyte in flowering plants (angiosperms). It is formed inside the ovule and contains the egg cell, synergids, antipodal cells, and the central cell. The arrangement of the nuclei in a normal embryo sac in dicot plants is as follows:
**Arrangement of Nuclei:**
- The embryo sac in dicot plants has a total of 8 nuclei.
- The nuclei are arranged in three distinct groups: the egg apparatus, the central cell, and the antipodal cells.
**Egg Apparatus:**
- The egg apparatus consists of three nuclei: two synergids and one egg cell.
- The synergids are located at the micropylar end of the embryo sac and play a role in guiding the pollen tube towards the egg cell.
- The egg cell is positioned between the two synergids and is the female gamete that fuses with the male gamete (sperm) during fertilization.
**Central Cell:**
- The central cell is the largest cell in the embryo sac and contains two polar nuclei.
- The polar nuclei are located in the center of the central cell and are involved in the process of double fertilization.
- Double fertilization is a unique feature of angiosperms where one sperm fertilizes the egg cell to form the zygote, and the other sperm fuses with the polar nuclei to form the endosperm.
**Antipodal Cells:**
- The antipodal cells are located at the chalazal end of the embryo sac and usually consist of three cells.
- The function of the antipodal cells is not well understood, but they are thought to play a role in nourishing the developing embryo.
**Conclusion:**
In conclusion, the arrangement of nuclei in a normal embryo sac in dicot plants is 3-2-3, with three nuclei in the egg apparatus (two synergids and one egg cell), two nuclei in the central cell (two polar nuclei), and three nuclei in the antipodal cells. This arrangement is characteristic of dicot plants and is important for the process of fertilization and embryonic development.
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The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer?.
The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]a)3 + 2 + 3b)2 + 3 + 3c)3 + 3 + 2d)2 + 4 + 2Correct answer is option 'A'. Can you explain this answer?.
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