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This phenomenon is known as polyploidy, wherein the cells contain more than two paired (homologous) sets of chromosomes. Polyploidy is often seen in the case of plants. The major cause of polyploidy is the non-disjunction of sister chromatids during meiotic recombination. This condition is actually useful in development of new crop varieties.

1. Polyploidy is seen in animals
2. Polyploidy is seen in plants
3. Polyploidy is caused by non-disjunction
4. Both (b) and (c)

Correct answer: Both (b) and (c)

Solution

Polyploidy is especially common in plants, and it can arise from nondisjunction during meiosis, which leads to extra chromosome sets. Since both statements are true, the combined option is correct.

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