Biology
The definite number of chromosomes in the cells of a human body is :
- 23 pairs
- 23
- 46 pairs
- 32
Answer
23 pairs
Reason — Every cell of the human body has 46 chromosomes which occur in 23 pairs. 23 chromosomes are inherited from the mother. 23 chromosomes are inherited from the father. Together they form 23 pairs (46 chromosomes).
23 is the number of chromosomes in a human gamete. 46 pairs would mean 92 chromosomes, which is incorrect. Humans do not have 32 chromosomes.
Related Questions
Which of the following is not a unicellular organism ?
- Bacterium
- Paramecium
- Spirogyra
- Chlamydomonas
The outermost layer of the cell is known as :
- Cytoplasm
- Protoplasm
- Epidermis
- Plasma membrane
Which of the following are non-living cell inclusions ?
- Nucleolus
- Genes
- Vacuoles
- Chromosomes
Assertion: Every organism, whether big or small, begins its life as a single cell.
Reason: The size of a single cell varies among different organisms.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.