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Which one of the following pairs of plant structures has haploid number of chromosomes?
[2007]
- a)Egg nucleus and secondary nucleus
- b)Megaspore mother cell and antipodal cells
- c)Egg cell and antipodal cells
- d)Nucellus and antipodal cells
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which one of the following pairs of plant structures has haploid numbe...
Egg nucleus and secondary nucleus has haploid number of chromosomes. While all other plant structures have diploid number of chromosomes.
Most Upvoted Answer
Which one of the following pairs of plant structures has haploid numbe...
I think ans should be B as secondary nucleus and MMC is diploid so B is correct...
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Which one of the following pairs of plant structures has haploid numbe...
Understanding Haploid Structures in Plants
In the context of plant biology, haploid structures refer to those containing a single set of chromosomes. This understanding is crucial for identifying the correct answer to the question regarding which pair has haploid chromosomes.
Key Haploid Structures
- Egg Cell:
- The egg cell (or ovum) is produced in the female gametophyte and is haploid, containing one set of chromosomes (n).
- Antipodal Cells:
- These are three cells located at the opposite end of the egg apparatus in the embryo sac, also haploid (n), contributing to the overall structure of the female gametophyte.
Analysis of Other Options
- Option A: Egg Nucleus and Secondary Nucleus
- The egg nucleus is haploid (n), but the secondary nucleus (formed by the fusion of two polar nuclei) is diploid (2n). Thus, this pair does not consist of two haploid structures.
- Option B: Megaspore Mother Cell and Antipodal Cells
- The megaspore mother cell is diploid (2n) as it undergoes meiosis to produce haploid megaspores. Therefore, this option does not represent a pair of haploid structures.
- Option D: Nucellus and Antipodal Cells
- The nucellus is a diploid tissue (2n) that surrounds the ovule, while the antipodal cells are haploid (n). This pair includes one haploid and one diploid structure.
Conclusion
Thus, the correct answer is option C: the egg cell and the antipodal cells are both haploid, making them the only pair in the options provided that consists solely of haploid structures. This knowledge is essential for understanding plant reproduction and the life cycle of angiosperms, especially in the context of NEET examinations.
In the context of plant biology, haploid structures refer to those containing a single set of chromosomes. This understanding is crucial for identifying the correct answer to the question regarding which pair has haploid chromosomes.
Key Haploid Structures
- Egg Cell:
- The egg cell (or ovum) is produced in the female gametophyte and is haploid, containing one set of chromosomes (n).
- Antipodal Cells:
- These are three cells located at the opposite end of the egg apparatus in the embryo sac, also haploid (n), contributing to the overall structure of the female gametophyte.
Analysis of Other Options
- Option A: Egg Nucleus and Secondary Nucleus
- The egg nucleus is haploid (n), but the secondary nucleus (formed by the fusion of two polar nuclei) is diploid (2n). Thus, this pair does not consist of two haploid structures.
- Option B: Megaspore Mother Cell and Antipodal Cells
- The megaspore mother cell is diploid (2n) as it undergoes meiosis to produce haploid megaspores. Therefore, this option does not represent a pair of haploid structures.
- Option D: Nucellus and Antipodal Cells
- The nucellus is a diploid tissue (2n) that surrounds the ovule, while the antipodal cells are haploid (n). This pair includes one haploid and one diploid structure.
Conclusion
Thus, the correct answer is option C: the egg cell and the antipodal cells are both haploid, making them the only pair in the options provided that consists solely of haploid structures. This knowledge is essential for understanding plant reproduction and the life cycle of angiosperms, especially in the context of NEET examinations.
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Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. 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 Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer?.
Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. 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 Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer?.
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Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which one of the following pairs of plant structures has haploid number of chromosomes?[2007]a)Egg nucleus and secondary nucleusb)Megaspore mother cell and antipodal cellsc)Egg cell and antipodal cellsd)Nucellus and antipodal cellsCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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