___________ are DNA threads which appear inside the nucleus at the time of cell division.

Spindle fibers

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Chromosomes

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Centrioles

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None of these

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Solution

The correct option is A
Explanation of the correct option:
Chromosomes are thread-like structures located inside the nucleus of animal and plant cells.
Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA).
Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.
Explanation of the incorrect option:
Option B,C and D didnot satisfy the appropriate explanation of the given question.
Final answer: Chromosomes are DNA threads which appear inside the nucleus at the time of cell division.

Suggest Corrections

Column 'A'	Column 'B'
(a) Chromosomes get arranged in a horizontal plane at the equator.	1.Anaphase
(b) Daughter chromosomes move to the opposite poles of a spindle.	2. Prophase
(c) Chromosomes become visible as fine long threads.	3. Telophase
(d) Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network	4. Metaphase