Question

Which is not true for anaphase?
(A) Golgi body and endoplasmic reticulum are reformed.
(B) Chromosomes move to opposite poles.
(C) Spindle poles move farther apart.
(D) Centromeres split and chromatids separate.

Answer 1

Hint: Anaphase is one of the four stages of nuclear division in mitosis and meiosis. Both mitosis and meiosis are types of cell division which is a progressive process. They consist of four stages namely, prophase, metaphase, anaphase and telophase. Each stage of mitosis and meiosis involves reorganisation of certain components of the cell and it is identified by the unique events.

Complete answer:
Cell division is a significant process which is taking place in all living cells. There are two types of cell division process, namely mitosis and meiosis. Either mitosis or meiosis, the four stages of nuclear division remain the same. But the events happening during each stage differ and stand unique.
Mitosis has been divided into four stages of nuclear division, namely, prophase, metaphase, anaphase and telophase.
Prophase – This stage of mitosis is characterised by events such as condensation of chromatin fibres, formation of chromosomes composed of two chromatids attached to the centromere. Moreover, the assembling of mitotic spindles and microtubules takes place during prophase.
Metaphase – This stage is characterised by events such as spindle fibres attaching to kinetochores of chromosomes, and chromosomes getting aligned along the metaphase plate.
Anaphase – This stage is characterised by events such as, spindle poles moving farther apart, which in turn moves the chromosomes to the opposite poles. Splitting of centromere takes place, which is a significant event of anaphase.
Telophase – Being the last stage of nuclear division, this stage involves decondensation of chromosomes into chromatin fibres. Organelles like nucleolus, Golgi apparatus and endoplasmic reticulum start reforming.

Understanding the Options one by one,
(A) Golgi body and endoplasmic reticulum are reformed.
Reformation of organelles is a key event of telophase. This stands not true for anaphase and hence this is the correct answer.
The other Options (B), (C), and (D) are the key events of anaphase stage.

Hence, the correct answer is Option (A)

Note: It is essential to remember the key events taking place during each stage of cell division. Prophase is marked by chromosomal condensation. Metaphase is marked by alignment of chromosomes along the metaphase plate. Anaphase is marked by splitting of centromere and movement of chromosomes towards opposite poles. Telophase is marked by reformation of organelles and nuclear membrane in the daughter cell.