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Question

Rahul was working on an experiment on the cells of onion peel. While observing the cells under the microscope, he finds many cells with thin thread like structures in their nucleus known as 'A'. In few other cells there were thick conspicuous X shaped structures called 'B' and in such cells he couldn't find the nuclear membrane. What is A and B?

A
A- Protein Fibres, B- Organelles
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B
A- Organelles, B- Protein fibres
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C
A- Chromatin Fibres, B- Chromosome
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D
A- Chromosome, B- Chromatin Fibres
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Solution

The correct option is C A- Chromatin Fibres, B- Chromosome
In a cell, when it is not dividing the genetic material containing DNA exists as thin thread like strands in the nucleus, known as the chromatin fibres/chromatin network.
During the time of cell division, the chromatin fibres are condensed to form dark, thick X shaped structures known as chromosomes.

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