In the nucleus of a cell, the thread-like structure in which genes are embedded is

Step 1: Analyze the question The question asks for the thread-like structure inside the nucleus that carries genes.

Step 2: Explain the concept Inside the nucleus, DNA is coiled with proteins (histones) to form thread-like structures called chromatin. During cell division, chromatin condenses into visible chromosomes. Genes are specific segments of DNA found along these chromosomes. This is why chromosomes are called the carriers of hereditary information.

Step 3: Check each option

• A. Centriole: A small cylindrical organelle in the cytoplasm of animal cells that helps form spindle fibres during cell division. It is not in the nucleus and does not carry genes.
• B. Chromosomes: Thread-like structures in the nucleus made of DNA and protein, and genes are located on them. ✔
• C. Cytoplasm: The jelly-like material of the cell outside the nucleus, where many organelles sit. It is not thread-like.
• D. Somatic cell: A body cell, not a structure in the nucleus.
• E. Spindles: Fibres that pull chromosomes apart during cell division. They are not where genes are embedded.

Step 4: Answer The correct option is **B.

Tip: Remember the chain Nucleus → Chromosome → DNA → Gene. Whenever you see "thread-like" and "genes" together in a question, think chromosomes.