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Diploid cells have
A. Two chromosomes
B. One set of chromosomes
C. Two pairs of chromosomes
D. Two sets of chromosomes

Answer
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Hint: Chromosomes are thread-like micro structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA) and is passed from parents to offspring.

Complete answer:
A diploid cell is a cell that contains two complete sets of chromosomes or this is double the haploid chromosome number. Each pair of chromosomes in a diploid cell is considered to be a homologous chromosome set. A homologous chromosome pair consists of one chromosome donated from the mother and another one from the father. Humans have 23 sets of homologous chromosomes for 46 chromosomes. Paired sex chromosomes which determine sex of individual are the X and Y homologs in males and the X and X homologs in females.
All of the somatic cells in your body are diploid cells and all of the cell types of the body are somatic except for gametes or sex cells present in sex organs, which are haploid. During sexual reproduction, gametes from parents (sperm and egg cells) fuse during fertilization to form diploid zygotes. A zygote, or fertilized egg, then develops into a complete diploid organism by mitosis.
This chromosomal constituent is designated by 2n, where n denotes basic haploid chromosome set.

Thus the correct option is D. Two sets of chromosomes

Note:
Diploid cells reproduce through mitosis and in mitosis, a cell makes an identical copy of itself. It replicates its DNA and distributes it equally between the two daughter cells that each receive a full set of DNA. Somatic cells go through mitosis and the (haploid) gametes undergo meiosis. Thus, Mitosis is not exclusive to diploid cells.