Which of the following cells do not contain nucleus? 1. Root hair cells 2. Red blood cells 3. Platelets 4. Monocytes Select the correct answer using the code given below.

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Q: 23 (CDS-II/2016)

Which of the following cells do not contain nucleus?
1. Root hair cells
2. Red blood cells
3. Platelets
4. Monocytes
Select the correct answer using the code given below.

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,8,38,15,12,12,7

keywords: 

{'red blood cells': [4, 0, 5, 4], 'cells': [0, 0, 0, 1], 'root hair cells': [0, 0, 0, 1], 'platelets': [0, 0, 0, 2]}

The correct answer is option 2: 2 and 3 only.

This means that red blood cells (option 2) and platelets (option 3) are the cells that do not contain a nucleus.

1. Root hair cells (option 1) contain a nucleus. Root hair cells are found in plants and play a role in absorbing water and minerals from the soil. They have a nucleus to carry out their functions.

2. Red blood cells (option 2) do not contain a nucleus. This is because during their development, the nucleus is expelled to make more room for hemoglobin, the protein that carries oxygen. Without a nucleus, red blood cells are more flexible and can easily travel through tiny blood vessels.

3. Platelets (option 3) also do not contain a nucleus. Platelets are cell fragments involved in blood clotting. Like red blood cells, platelets discard their nucleus as they mature.

4. Monocytes (option 4) do contain a nucleus. Monocytes are a type of white blood cell and are part of the immune system. They have a nucleus to carry out their various functions, such as identifying and engulfing pathogens.

Therefore, the correct answer is option 2 as red blood cells and