Question

Which one of the following is correct for mitosis in most of the plant members?
A.Amphiastral, anastral and eumitosis
B.Anastral, acentric and premitosis
C.Anastral, acentric and eumitosis
D.Astral, centric and eumitosis

Answer 1

Hint: For most of the plant members, mitosis that occurs forms spindle fibers but there is no centriole or asters. The type of mitosis occurs in which the nuclear membrane dissolves so that there is no distinction between nucleoplasm and cytoplasm and the chromosome is lacking a centromere.

Complete step by step answer: 1.Mitosis is defined as the division of the cell nucleus in which the genome is copied and distributed into two identical halves. It is normally preceded by cell division.
2. Plant cells have a characteristic anastral mitosis. They do not have centrioles or centrosomes. At the time of the plant cell division, there occurs the formation of spindle fibers but asters and centrioles are not formed. Hence, it is called anastral mitosis.
3. Acentric mitosis also refers to the process of mitosis that occurs without centrioles. The anastral spindle is also known as acentric.
4. Eumitosis is found in plants and it is a type of division in which during prometaphase the nuclear membrane dissolves so that there remains no differentiation between nucleoplasm and cytoplasm. The chromosomes through their centromere are attached to the spindles.
Hence, the correct answer to the above question is option (C) i.e. anastral, acentric, and eumitosis.

Note: Points to remember-
Most of the plant members have mitosis which is anastral i.e. lacking astral and centrioles during the cell division. Anastral is also known as acentric mitosis (no centrioles). Eumitosis refers to the condition during prometaphase where the nuclear membrane dissolves resulting in no distinction between cytoplasm and nucleoplasm.