Question

Which statement is incorrect for the given life cycle $X$ in protists?

• A. The life cycle $X$ is haplontic.
• B. The life cycle $X$ is diplontic.
• C. In life cycle $X$, vegetative cells produce gametes.
• D. Life cycle $X$ is found in Ceratium and Gymnodinium.

Answer 1

The correct option is B The life cycle $X$ is diplontic.

The correct answer is B because the zygote is 2n that divides by meiosis and produces vegetative cells with 1n chromosome number which further divide repeatedly by mitosis gives daughter cells with 1n chromosomes. Some vegetative cells produce gametes. These gametes combines during fertilization to form zygote with 2n chromosome. In the whole cycle, the zygote is the only diploid cell, mitosis occurs only in haploid phase. Hence, the life cycle X is haplontic. This type of life cycle is found in Ceratium and Gymnodinium.

Thus, the correct answer is 'The life cycle X is diplontic..'